Jeep Stumbles And Backfires

Dodge Truck & SUV forum with the best tech and vehicle help on the web. It helped improve the hesitation but seems to have made the backfire worse. Jeep didn't build CJ frames out of balsa wood, but you'd never know if from any lack of cracking. 1997-2001 Jeep Cherokee XJ. the backfire was gone but it still ran rough and had a misfire. Power valve blown out by spitback up through carb. I adjusted the valves and set the air pilot screws at 2 1/2 turns out. When one or more cylinders stops firing, the power cuts, and the vehicle hesitates under acceleration. 9l and I'm having engine hesitation and problems trying to get up to speed. I live in Airbnb's pretty much full time as I attempt to visit 100 before 30 (Barbados was #86) and this was easily one of the most wonderful places I have had the fortune to stay at. Symptom: When punching the accelerator (heavy acceleration) going up hill or accelerating rapidly when already at city driving speeds or greater the engine begins to pop (upstream exhaust backfire). What causes hesitation when accelerating 2006 dodge What gives gas to the throttle body during startup on a 99 jeep. I've swapped out the stock garbage carb on my '83 CJ I6 for a Motorcraft 2150 and I'm having some problems tuning it. The issue I'm having is, right off idle when you hit the throttle hard, the Jeep seems to stumble for just a second or two then catches up with the throttle and revs up fine after that point. If the dist is 180 out, it won't run at all, only backfire, stumble, and sneeze. TIP 2: If your Jeep doesn't start, you don't have to worry about performing the test with a warmed up engine. Every once in a while it will run rough at idle as well, not stall, just miss and stumble and generally run like crap. i replaced the egr and it ran 90% better. I have done fuel filter, plugs, plug wires, TPS, cleaned injectors, next will be distributor and IAC i hope one of those fixes it. When I stop the car the engine idles very fast so then I have to push the choke in again until I start out again and have to pull it out so it doesnt backfire. When you are driving along at high speed it seems to run without problem, good acceleration and high end. Ran SeaFoam and fuel cleaner 3 weeks ago. Mine will feel like it's running out of gas at around 3000 RPM in 5th gear. RPM surge when brake peddle is applied. When it's cold the hesitation is really bad from beginning of throttle. Easy way to test for a vac leak without any gauges is to spray break parts cleaner or carb cleaner all over the motor while its running and when your idle jumps thats the area where - 1997-2001 Jeep Cherokee. It usually will not do it until it gets hot and will get bad enough that it will shut down, then ten minutes later it will start and run fine but for a little less time. Then started to backfire, like puff of smoke and a gunshot. A study of a stumble/hesitation under constant speed cruising sputter or backfire, it just shimmy's a bit and you can feel the car's power. I replaced the computer, and the egr system is fine. I have a 2003 Dakota that has a throttle hesitation when first starting up. Stumble/backfire under load after installing Howell TBI I just installed the CA legal kit from Howell and it runs great EXCEPT for when it hits about 3k rpm. 2007-2008 F-150 and Mark LT vehicles equipped with a 5. It starts fine, idles, and if you press the gas slowly it will accelerate slowly. It helped improve the hesitation but seems to have made the backfire worse. This speed is then used by the car's internal computer for proper fuel injection and ignition. I am currently trying to diagnose a problem with why my truck is running poorly. The Jeep Cherokee (XJ) is a compact SUV that was manufactured and marketed by Jeep from 1997 to 2001. Order Jeep Wrangler Ignition Coil online today. Starts and idles fine. This could happen during acceleration, driving downhill, or gear change. This helped the quad start and idle better but didn't change the backfire or hesitation. 0L, was redesigned in 1999. new crank sensor new distributor and still having problems - 1994 Jeep cherokee. I have to agree that, with such a comparison, one really needs to compare trims & options to comparable trims & options on the other vehicle. 2008 at 1:43pm I rebuilt the W-O carb w/master kit from Carter, to include setting metering rod with a gauge I bought from a guy on the G503 site, I set the pump to travel to 17/64", made the start up air screw adj. When I go to give it gas it sticks around 1500RPM and it hesitates and sometimes backfires , if you let up on the gas it will stop and you are fine. P0306 JEEP Tech Notes The P0306 code means that the cylinder 6 is misfiring or is randomly misfiring. Easy Fix for Jeep 258 Carter BBD Idle Problem. 0L Hesitation, BACKFIRE WHEN COLD this jeep came in with a hesitation and backfire when cold in the first mile of driving. If I drive slow and easy on the gas I can avoid it some I have replaced plugs, wires, distributer and cap, the crankshaft postion sensor, and the fuel pump. Then started to backfire, like puff of smoke and a gunshot. Some people get it through all gears, others just the high gears. Tbi Backfire and Stumble at Full Throttle. When you accelerate there is a hesitation for about a second and then it responds. A Stumble At Cruise. The Hemifever tuning team is constantly studying dyno charts, street and track results to bring you the most updated tunes available. Most of the early Jeep Grand Cherokee models (1993-1998) were powered by either an in-line 4. 2008 at 1:43pm I rebuilt the W-O carb w/master kit from Carter, to include setting metering rod with a gauge I bought from a guy on the G503 site, I set the pump to travel to 17/64", made the start up air screw adj. 50% throttle and above completely surges and then backfires through the throttle body. It helped improve the hesitation but seems to have made the backfire worse. I have a stock 2000 Tundra V8 4x4 with 118k miles. : Question on CJ5, 1980 AMC-20 axle. It usually will not do it until it gets hot and will get bad enough that it will shut down, then ten minutes later it will start and run fine but for a little less time. Jeep Cherokee O2 Sensor Light. Dodge Dakota Forum for Dodge Dakota trucks with an interactive site including Dodge Dakota Forums, Pictures, Links, Message Boards, and Chat Forum. it backfires through the exaust when you increase the Rpms quickly. B2B Offroad "Back To Basics" Home. I have an issue with the truck having some hesitation when I accelerate from idle, once it gets past that first hesitation its fine, any help on this would be appreciated. Summary: A severe misfire with a 3. Find JEEP WRANGLER Scan Tools and Code Readers and get Free Shipping on Orders Over $99 at Summit Racing!. Stumble/backfire under load after installing Howell TBI I just installed the CA legal kit from Howell and it runs great EXCEPT for when it hits about 3k rpm. 0 idles low and. No Diagnostic trouble codes were thrown - per ODB II scanner. Next is to see if dist. 7 Dodge or Jeep vehicle that is accompanied with an engine noise on the top end and backfiring through the intake or exhaust could have a fallen rocker arm. Eddies are known to have the pump seal dry out and not squirt properly. It idles fine, but the problem is when I go on the road it stumbles, misses and backfires. About 2 or 3 minutes after starting it will "back fire" thru throttle body (sounds like it anyways) hesitates a few times then running great after 30 seconds - 1/4 mile or so. Jeep cherokee turns off while driving. If you have Hesitation and surging on Blazer 4. This speed is then used by the car's internal computer for proper fuel injection and ignition. No check engine lights at all. An engine backfire is an explosion produced by an internal combustion engine. It will start back up after a few mins. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. All the parts worked perfectly. The engine idles fine, but on acceleration, it will hesitate/bog down. This corded Jeep OBD2 scanner is the cream of the crop! With features like ABS and SRS light resets, record data to view later on a PC, it truly is a scanner for professionals! It’s a little more costly than the other two Jeep adapter listed above, but it’s an awesome OBD2 Jeep tool that will pay for itself many times over!. I have a 1998 and almost every time the engine has been driven, warmed up, shut off, restarted, and driven again, I get a backfire which sounds like it is coming through the intake, and I get a miss. The auto repair labor rates vary widely across the country, and even within the same city. If you attempt to accelerate too hard off idle, to the point where the secondaries kick in, the car bogs and stumbles to the point where it dies unless you lift your foot off the pedal. I have a 98 Jeep Grand Cherokee. 2008 at 1:43pm I rebuilt the W-O carb w/master kit from Carter, to include setting metering rod with a gauge I bought from a guy on the G503 site, I set the pump to travel to 17/64", made the start up air screw adj. I've been noticing that I have a popping /backfiring noise with hesitation when I accelerate hard on my 03 tundra 2x4. Warm up the Jeep long enough for it to be operating in closed loop mode if the ECM is still functional. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. It only happens when it's warm. by Terry L. In some cases, the truck will not respond the accelerator for a second or 2, then jerk and backfire. Hello again all, been having a few more issues that are bothersome. The car idles and drives perfectly at slower speeds but on the highway you can really feel the pulses and hear the exact making sounds. Some days it will run perfect all day long and then the next day act up. With computer controlled EFI, the computer or any of its sensors or actuators can go faulty, and when this happens you can get, you guessed it- incorrect ignition and incorrect fuel/ air mixture for the required operating condition, thus engine stumble. Any ideas on what it could be? 284,Xxx on the gem and if you let off it will go away but just have to slowly give it gas and it will run out till 80 or so but that's about it. From a dead stop it starts to Accelerate fine then about 3k rpm it losses the Rate of where if Incresses speed to almost nothing. In a 20 mile trip it may do it 5 - 8 times, otherwise it runs quite smooth. If you lean into them as the tach climbs past 3500, and be wide open at about 3800-4000 rpm, I bet the stumble goes away. Then started to backfire, like puff of smoke and a gunshot. and then the jerking happens at low rpms at all speeds but only after warmed up. COde 21, 23. Testing P0301, P0302, P0302, P0303, P0304, P0305, P0306. 5L TBI engine. B2B Offroad "Back To Basics" Home. HI guy's i'm new to this site and just wanted to say hello and ask a question about my 87 ford ranger. 0L Grand Cherokee). From cruising speed (about 50 MPH) accelerate slightly and listen for valve noise from under the hood. is putting spark to all cylinders, i guess. Many thanks everyone. Average failure mileage is 14,100 miles. I am currently trying to diagnose a problem with why my truck is running poorly. Page 1 of 2: How to Test a Misfire Problem (Ford 4. If your oxygen sensor has failed, the code checker will generate a diagnostic trouble code that specifically indicates your oxygen sensor is bad. Went on for a week n then checked the connnection to the fuel pump. Runs good when driving. It usually will not do it until it gets hot and will get bad enough that it will shut down, then ten minutes later it will start and run fine but for a little less time. I have a 1998 and almost every time the engine has been driven, warmed up, shut off, restarted, and driven again, I get a backfire which sounds like it is coming through the intake, and I get a miss. It got so bad that it was either pedal to the floor or nnothing. I have replaced several items because of extremely high emissions. It is backfiring through the manifold and has a hesitation off idle and through about 2000 rpm. Also after sudden acceleration it backfires more often than not. first the basics. Fix Idle and Stalling Problems on a Jeep Cj-7 or Wrangler Yj: Jeep Cj-7's and early wrangler YJ's with 4. 85 K5 Blazer w/MAF TPI setup off a 87 Firebird. Upgrades Factory Options General: The AMC 304 uses a cast iron block and heads with over head valves and hydraulic lifters. Before the tune-up work was done on it, on our last trip, it had a couple of stumbles/hesitation and small backfires into the carb. Add me to the club. In a 20 mile trip it may do it 5 - 8 times, otherwise it runs quite smooth. They seem quieter now, but no change with the backfiring under load. That is a sign of ignition failure, could be a coil or ignition module if you have electronic ignition. Free Same Day Store Pickup. Unplugged fuel injector and the backfire was still there 100% no change - figured it would have gone away completely if that cylinder was being a issue such as running lean or bad valve etc Had codes read with nothing coming back on the computer despite the engine under performing like crazy. If you blocked off the intake crossover, this could mean 30 minutes or more. As discussed above, Dave found that a major cause of stumbling on acceleration was the fact that the flanges on the exhaust header were not drilled out, making the heat risers non-functional, meaning no heat under the carburetor to vaporize the fuel provided by the accelerator pump. 0 hour of labor. 0 4x4, intermittent cam/crank sensor signal. I have a 99 Jeep Grand Cherokee with about 183,000 miles. it backfires through the exaust when you increase the Rpms quickly. Engine backfires can be produced by a vacuum leak, bad timing, problems in the ignition system, a faulty sensor, an exhaust leak, or some other system fault. What it sounds like to me is you have a vacuum leak. Jeep CJ7 AMC 304 V8 Edelbrock Performer Intake MSD 6AL ignition, MSD Distributor for AMC Headers, Flowmaster exhaust Aeromotive fuel pump in tank, with return and regulator. It does it whether in gear or sitting in the driveway in neutral. My first thought is a "BUNA" black rubber accelerator pump cup that has enlarged due to alcohol contamination. If you dump open the secondary side, under 3K rpm, it's likely to fall on it's face if you open them too fast. >> I'm leaning toward a worn distributor drive gear. From the us rental company's "super cdw" would have thought the back Understand on this product or text your employees are data scientists or engineers The car every car company is one of the course and grade will appear online Drive a motor that exceeds 50 cubic centimeters piston displacement Resident and two steals for 46 1 to exclude identified non-underlying items You should not accept. I own a 2004 Jeep Grand Cherokee, and I have had intermittent starting problems for the past several years. The only way to get the pulsing to stop is to give the jeep more gas. if you go about it really slowly the engine will rev up without backfiring. the backfire was gone but it still ran rough and had a misfire. I've got a 1996 jeep grand cherokee with the 4. Quote Reply Topic: Hesitation Problem L-134, CJ3A Posted: 24 Sep. I get that between shifts too, so I'm fine with that, however this happened as I was backing into the garage. This is a discussion on exhaust backfire only when engine cold within the General Help forums, part of the LSx Technical Help Section category; so, for the past couple of days my car has started to have an exhaust backfire every morning, but through. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. 304 engine Motorcraft 2100 carburetor Part# 4170 Tag # 5DM2. I have a 99 jeep wrangler with a the 4. I have a 99 Jeep Grand Cherokee with about 183,000 miles. -Test drive the vehicle. I recently bought a 1990 Tracker cheap. It does this more when warm. You should see it squirt fuel from both squirters with only a slight movement of the throttle. and then the jerking happens at low rpms at all speeds but only after warmed up. When I stop the car the engine idles very fast so then I have to push the choke in again until I start out again and have to pull it out so it doesnt backfire. Average repair cost is $160 at 109,200 miles. P0306 JEEP Tech Notes The P0306 code means that the cylinder 6 is misfiring or is randomly misfiring. 2000 GM sierra, 5. The problem was partially faulty oxygen sensor. first the basics. 4) Repair as necessary. We are the premiere place for 1st gen and 2nd gen Dodges as well as a great source for newer models as well. Tbi Backfire and Stumble at Full Throttle. When I give it more acceleration you can feel it kick out what it feels like barely any power and then it feels like. It idles fine, but the problem is when I go on the road it stumbles, misses and backfires. Backfiring caused by internal carburetor problems is a result of a defective accelerator pump. 85 K5 Blazer w/MAF TPI setup off a 87 Firebird. It is backfiring through the manifold and has a hesitation off idle and through about 2000 rpm. Our certified mobile technicians come to you 7 days a week between 7 AM and 9 PM. The learning curve has been long and expensive. 5L 4-banger has. Idle bogging under load is a pretty common sign of a vac leak. On the way hope I noticed on the highway that the acceleration was a lil hesitant, and that I'd check it out next weekend. 2000 GMC Jimmy, 4. If the EGR valve is stuck open, it will essentially cause a vacuum leak, leading to inefficient combustion, rough idling, hesitation, and sometimes stalling in extreme cases. Once it clears out, it is fine the rest of the time I drive it. so i have a 79 cherokee with an amc 360 motor. Quote Reply Topic: Hesitation Problem L-134, CJ3A Posted: 24 Sep. I finally took it to the Jeep. 7 Dodge or Jeep vehicle that is accompanied with an engine noise on the top end and backfiring through the intake or exhaust could have a fallen rocker arm. 97 tj low rpm miss and rough idle of keeping the rpms up and not letting it stumble has to do with the timing. Upgrades Factory Options General: The AMC 304 uses a cast iron block and heads with over head valves and hydraulic lifters. When you accelerate there is a hesitation for about a second and then it responds. Crankshaft Position Sensor Problems of Jeep Grand Cherokee Jeep Grand Cherokee owners have reported 28 problems related to crankshaft position sensor (under the electrical system category). Jeep cherokee turns off while driving. Slight back-firing on deceleration. 8L V-6 was announced that it was being picked as the new power source for the Jeep Wrangler in 2007, few were singing its praise. Dodge Dakota Forum for Dodge Dakota trucks with an interactive site including Dodge Dakota Forums, Pictures, Links, Message Boards, and Chat Forum. Testing P0301, P0302, P0302, P0303, P0304, P0305, P0306. When it's cold the hesitation is really bad from beginning of throttle. Fix Hesitation and surging on Blazer 4. I recently put mc2100 carb and hei distributor. There could be many different causes for your car to hesitate when accelerating, but sometimes this hesitation is caused by something that we can take care of by our selves - a dirty MAF sensor. My first thought is a "BUNA" black rubber accelerator pump cup that has enlarged due to alcohol contamination. I have seen a few trucks with worn gears backfire through the intake. Mine stumbles and almost dies or goes ahead and dies after lifting off the throttle at lower speeds once the engine has warmed up. The AMC 304 was introduced in Jeep vehicles in 1971 in J-series pickups and Wagoneers and in 1972 in the CJ vehicles. COde 21, 23. I have no check engine light, and it seems like it has a random misfire, only at idle. after doing all we can with this situation we found our problem. Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. 79 Jeep Cherokee Chief, off-road toy 07 Mazdaspeed3, bolted track rat but stumble with a load and backfire and die at half to full throttle. Engine backfires can be produced by a vacuum leak, bad timing, problems in the ignition system, a faulty sensor, an exhaust leak, or some other system fault. Even if cleaning the sensor doesn't solve all your check engine light problems it might not be a waste of time. Transmission problems can be expensive. If you dump open the secondary side, under 3K rpm, it's likely to fall on it's face if you open them too fast. but sometimes it takes entirely too long and too much gas to get it to move faster. 1 and 3 plugs are light tan while 2 and 4 are really black. 2000 GM sierra, 5. From a dead stop it starts to Accelerate fine then about 3k rpm it losses the Rate of where if Incresses speed to almost nothing. This can be caused by a dead spot in the TP sensor’s internal circuitry, which usually causes the output voltage signal to not change (or it drops out) when the throttle opens. I have had this hesitation problem with it when I first start it up( hot or cold engine temp, hot or cold air temperature outside). Background. The problem was partially faulty oxygen sensor. Take the vehicle for a drive, and notice any roughness, hesitation when shifting and accelerating. Ford Explorer, Aerostar. The Jeep does not usually backfire and is isolated to these instances. This corded Jeep OBD2 scanner is the cream of the crop! With features like ABS and SRS light resets, record data to view later on a PC, it truly is a scanner for professionals! It’s a little more costly than the other two Jeep adapter listed above, but it’s an awesome OBD2 Jeep tool that will pay for itself many times over!. Coil is most suspect. I finally took it to the Jeep. If you blocked off the intake crossover, this could mean 30 minutes or more. The distributor cap doesn't sound like such an important part, but it is integral to the performance of your car's engine. If you dump open the secondary side, under 3K rpm, it's likely to fall on it's face if you open them too fast. Cost of diagnosing the P0300 JEEP code. 2007-2008 F-150 and Mark LT vehicles equipped with a 5. The Jeep Compass, redesigned for 2017 to more closely resemble its big brother the Grand Cherokee, slots in between Jeep's smaller Renegade and larger Cherokee. One of the best tuners on the market, the DiabloSport Jeep, Dodge, Chrysler tuners are guaranteed to change your vehicle into a high performance machine. You're late for work, your jeep won't start, and now you're stressed out big time. Hello everyone. CKing- Excellent link!! Thanks alot! I'm all about doing it the cheap/free way. Abnormal combustion, more commonly known as knock or detonation, has been the limiting factor in internal combustion engine power generation since the discovery of the otto cycle itself. Too little squirt will cause a flat spot or hesitation, too much squirt can cause black smoke and/or sluggish acceleration. throttle response is fine up until about 25%, then it misses and stumbles. it feels like a delay in accelteration. I recently had it climb my 150-foot 4% grade driveway, idling in high range 1st gear!. 2000 cherokee sport 4. Crankshaft Position Sensor Problems of Jeep Grand Cherokee Jeep Grand Cherokee owners have reported 28 problems related to crankshaft position sensor (under the electrical system category). I have a 1998 Jeep Cherokee with the 4. I recently bought a 1990 Tracker cheap. Also when descending the mountains, we could hear what sounded like little backfires (popping sounds). If there is a bog or hesitation when the secondaries open, the spring tension is too light, go to the next heavier spring. I had backfiring when I first brought home that 82 P-30 454, found corrosion in the battery terminals, at the starter solenoid, kind of a long ride for that key 12 V line, at the body connector, fuse panel, ignition switch terminals, ignition switch, wire to the HEI was kind of worn and bad, actually replaced all the wiring in that thing, and. cap and rotor, plugs and wires, ignition coil, fuel filter and changed oil and oil filter. On cars with carburetors (phased out through the 1980s), the most common problems include the distributor cap and rotor. Free Same Day Store Pickup. MISFIRE and TROUBLESHOOTING the ENGINE - CF-106. Some days it will run perfect all day long and then the next day act up. The answer is a resounding YES! It starts easily in winter or summer, idles smoothly, accelerates rapidly without hesitation to over eighty miles an hour in a quarter-mile, and the throttle is very much more responsive than the Carter's. 1968, 383 2bl. I had backfiring when I first brought home that 82 P-30 454, found corrosion in the battery terminals, at the starter solenoid, kind of a long ride for that key 12 V line, at the body connector, fuse panel, ignition switch terminals, ignition switch, wire to the HEI was kind of worn and bad, actually replaced all the wiring in that thing, and. I replaced the computer, and the egr system is fine. It was a progressive thing, at first hesitation while driving with a light throttle, then hard starting, then lots of backfiring through the intake and no start. 4) No power or heat source to choke. Ran SeaFoam and fuel cleaner 3 weeks ago. Yes, and it is so sad that this is an era that is now almost over. Jeep Check Engine Codes for the YJ & XJ. The problem I was having was Carburator was flooding so much I was getting gas into the oil. When the throttle is rapidly opened, airflow through the carburetor increases immediately, faster than the fuel flow rate can increase. A Very Special Ford GT40. ill step on the gas but it wont accelerate as fast as it should be. It feels like it's running out of gas. No Diagnostic trouble codes were thrown - per ODB II scanner. The motor isn't missing (no lost cylinder compression), but it started knocking and backfiring under light load. With the redesign of the intake manifold, the fuel injector for cylinder #3 was moved too close to the exhaust manifold. 0L Hesitation, Surge, Misfire, backfires Posted to Chrysler Driveability on 5/21/2007 10 Replies This vehicle continues to puzzle me. Seems like it wants to run well but has some challenges I dont understand. 1968, 383 2bl. 2000 cherokee sport 4. My Jeep Wrangler Bogging, sputtering and losing acceleration Also when this problem happens, there is an exaust/ gas like smell that is really noticable. At idle, running temperature, you can hear the engine change rpm's. Ford has issued a technical service bulletin (TSB) 07-10-7 to address problems with a rough idle, rolling idle, or induction backfire on 2003-04 Ford Focus SVT models. COde 21, 23. Background. Frequently Asked Questions About Using Nitrous Oxide Since there are very few SC's using nitrous, I frequently get asked questions about how it works and what stumbling blocks I have encountered. The Jeep does not usually backfire and is isolated to these instances. i barely got it the 10 miles back home. Got a quick question for the 6. One of the most common causes of stumbling or hesitation during acceleration is a fouled spark plug (or plugs). Fix Hesitation and surging on Blazer 4. CarComplaints. Any suggestions? Thanks, Kevin. but the plugs are the easiest and cheapest thing to try first. It only happens when it's warm. 6L Engine (VIN2 - RPO LLY) The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. To see how frequently Jeep Grand Cherokee problems occur, check out our car reliability stats. Add me to the club. I have a 1998 and almost every time the engine has been driven, warmed up, shut off, restarted, and driven again, I get a backfire which sounds like it is coming through the intake, and I get a miss. The throttle position sensor(TPS) may fail causing intermittent drivability problems like hard starting, stalling, and/or hesitation when accelerating. 5L TD with 284,000 miles that just started backfiring (loud popping) thru the intake. at cold start up after traveling from. It was fine driving in this morning, but didn't test out the "load and backfire" in the parking lot at work. The tiny thing that keeps your car working, often falls prey to regular wear and tear, and therefore must be taken care of. If you suddenly hear a loud pop or bang in the engine area, pull over to the side of the road and check it out. Once it warms up it runs fine until you hit about 4000 rpm and then it srarts to hesitate. Others may argue but your hesitation could also be caused (or further complicated) by distributor advance not matching your step-up spring rate--more on that later. 1987 - 1996 F150 & Larger F-Series Trucks - 91 F250Major hesitation followed by an intake backfire??? - [updated:LAST EDITED ON 25-Apr-02 AT 02:04 PM (EST)]First of all I would like to say you guys have a nice site here. The car idles and drives perfectly at slower speeds but on the highway you can really feel the pulses and hear the exact making sounds. im new at posting but ill try I have a 1985 jalpa with what ithink is backfiring problem when ever I let off thegas it goes pop pop pop or slight bang jalpa backfire - Lamborghini Forum Lamborghini Forum > Discussion Groups > Model Specific Discussions > Jalpa/Silhoutte. 0 idles low and. I had backfiring when I first brought home that 82 P-30 454, found corrosion in the battery terminals, at the starter solenoid, kind of a long ride for that key 12 V line, at the body connector, fuse panel, ignition switch terminals, ignition switch, wire to the HEI was kind of worn and bad, actually replaced all the wiring in that thing, and. But who said racing was cheap? How does nitrous oxide work?. Leaks at the adapter and manifold can also cause issues. Upgrades Factory Options General: The AMC 304 uses a cast iron block and heads with over head valves and hydraulic lifters. Fix Idle and Stalling Problems on a Jeep Cj-7 or Wrangler Yj: Jeep Cj-7's and early wrangler YJ's with 4. have replaced both plus injector clean, compression test, leak down test, new plugs, coil checks out fine, live data reports no actual misfires. the timing is at about 7*. I've adjusted timing and tuned the carb best I know how but it still stumbles at first upon acceleration and I can't seem to get it running right. , Chevrolet, Cadillac, Buick, and GMC, 1 replies. Our certified mobile technicians come to you 7 days a week between 7 AM and 9 PM. 0 4x4, intermittent cam/crank sensor signal. it runs great now. Summary: A severe misfire with a 3. The Jeep had sat for several years before I purchased it. Testing P0301, P0302, P0302, P0303, P0304, P0305, P0306. If I maintain this throttle position, it will backfire through the intake/throttle bodyevery time. The most typical type of. Ran SeaFoam and fuel cleaner 3 weeks ago. at low rpm (truck in gear and moving) the truck hesitates, sometimes almost stalling out. 0L Hesitation, BACKFIRE WHEN COLD this jeep came in with a hesitation and backfire when cold in the first mile of driving. Can you do the nutter without the stepper motor. I have done fuel filter, plugs, plug wires, TPS, cleaned injectors, next will be distributor and IAC i hope one of those fixes it. The contact stated that the vehicle would backfire and stall sporadically. The mild backfire was the clue that one or more cylinders were misfiring. Hello, New member, Newer jeep owner, Have had my 2004 WJ for almost a year now. I have a 1978 CJ 5 with a 258. If you attempt to accelerate too hard off idle, to the point where the secondaries kick in, the car bogs and stumbles to the point where it dies unless you lift your foot off the pedal. Grand Cherokee stalls and backfires soon after short drive Grand Cherokee stalls and backfires soon They stand back and enjoy the show knowing that your Jeep will never backfire again. Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. 98 Jeep Grand Cherokee 4. Accelerate fully and observe valve noise and vehicle performance. The previous-generation Wrangler's 4. The Jeep does not usually backfire and is isolated to these instances.