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  1. KJ Liberty Forum
    As the title says, I'm trying to find a diagnostic tool that gives a live reading of the misfires as the engine cycles. We've tried Autel Maxicoms and Xtools, and neither of them can read the misfire data on the Jeeps. We have a 2000 s10 truck that it can read this data from, so those tools can...
  2. YJ Wrangler Technical Forum
    New member here and first time wrangler owner 1988 YJ with the 4.2l, 3spd auto, nutter bypassed, Webber carb (not sure of the model but not the 32/36) When i first bought the Jeep it ran poorly, needing to double pedal just to stay running at stop lights. It was running very rich at idle...
  3. WJ Grand Cherokee Forum
    I have a 2002 Grand Cherokee Limited 4.7 V8 with 130K miles, bought used at 60K miles 10 years ago and used as daily driver since. I had some electrical problems including battery drain about 2 years ago so laid it up and bought a new car. Recently started fixing it up, found and fixed a...
  4. WJ Grand Cherokee Forum
    VERY occasionally I start the Jeep and have a rough running, flooding engine. Stinky catalytic converter and all. Warm, Cold, Driven 5 minutes ago, Parked all week, doesn't matter. Will not self clear no matter how far I drive. HOWEVER, if I simply turn it off, and remove the key (may not be...
  5. KJ Liberty Forum
    Hey Y'all! Been a while since needing advice! Having a Cylinder #6 Misfire. Even my Mechanic is stumped. He's ran Computer Diagnostics Twice now. Original diagnosis was Short Circuit on the PCM. I replaced the unit and it threw codes for the entire Passenger side bank. Both PCMs at least...
  6. TJ Wrangler Technical Forum
    I have replaced injectors, coil packs, plugs, flushed my rad, and replaced my thermostat and temp sensor and I still can’t find the problem causing my misfire. It’s only a specific cylinder 1 misfire. Also I just replaced the 02 sensors and I’m getting the current codes.P0442, P0155, P0135, and...
  7. TJ Wrangler Technical Forum
    Background: I was driving on a feeder road about 50 mph and a truck clipped me sending me swerving off strait at a curb. Hopped the curb, bent my axle housing and was still able to drive to a shop. Ever since then my jeep has been idling rough (250-500rpm) or dying. It is running very rich and...
  8. YJ Wrangler Technical Forum
    500 miles on a rebuilt 2.5 L. Smog check passed, engine ran great. Then; Backfire and jumping Tach needle, low power with a misfire. At rebuild...crank position sensor new, cam position sensor in distributor new. Distributor, cap and wires new. Plugs new. Installed a rebuilt PCM...
  9. Engines & Drivetrain
    So, I have searched the threads and see that the error I am having is/was a known flaw in the engine. Bought the car used in 2018 V-6 w/low miles and bought extended warranty, good for rest of this year. I have 95K miles. Car was in for spark plugs and tranny service. Dealer now has car and is...
  10. TJ Wrangler Technical Forum
    I have a 2000 jeep tj with 216k miles with a fresh rebuild engine with a tuply head and new spark plugs. The jeep at 4.10 gearing a 3' lift with 33" tires. So here is my problem. i drove the jeep around 40 miles only going 55-60 miles per hour with no problems. Jumping the the expressway i hit...
  11. TJ Wrangler Technical Forum
    As the title states, I’ve got a misfire in cylinder 6. Diagnosed from turning the key 3x to show code P0306. Specs are as follows. -2003 TJ - 4.0L - automatic trans - ~120k - recently replaced the alternator and battery - engine has a newer head gasket - common rear main leak - no other major...
  12. TJ Wrangler Technical Forum
    Hello. I have a 2001 TJ, 4L automatic. Engine has 125K miles. Lot's of stuff has been replaced, including a rebuilt transmission about 20K miles ago. Symptoms About a year ago the engine started throwing p0300 codes. Crankshaft Position Sensor (CPS) problem or misfires on various cylinders (300...
  13. Engines & Drivetrain
    Here's my story, I have a 2001 Jeep Cherokee XJ, 70,000 original miles. I bought it with the misfire. The guy said he was driving it home from work that very day when it started misfiring, I was already on my way to pick it up. So he took a couple hundred bucks off our agreed upon price hoping...
  14. ZJ Grand Cherokee Forum
    I got a 98 ZJ with a 4.0 The past week I started having a misfire on cylinder 4. It misses at idle intermittently and while in gear it misses heavily and will die if it gets too hot. I had carbon tracking on my distributor cap so I replaced the cap,rotor,and pickup. Also replaced the spark plugs...
  15. ZJ Grand Cherokee Forum
    Hi All, New to the Jeep world... well at least my own Jeep. I received a 1997 GC Tsi 4.0L from my father. It has 233k miles on it and it's pretty clean. It has two issues that I cannot figure out. I've spent hours reading the forums and haven't found a great answer. 1) The transmission (which...
  16. Engines & Drivetrain
    Have a 2002 Jeep Liberty 3.7. Has about 170,000 miles on it. I've owned it for a little over a year. Only had to do minor repairs to it. And up until today, the Check Engine Light has never come on. Jeep has been running fine as of late. Filled up the tank yesterday morning and had been...
  17. Engines & Drivetrain
    Hi guys, I've been a long time reader but first time poster looking for some help. I just recently got a 2007 WK Grand Cherokee Laredo 3.7L V6 with 174,000 miles on the engine. I got it from a trusted friend who treated it with meticulous care since he got it new off the lot. It's bone stock...
  18. WK Grand Cherokee & XK Commander Forum
    I drive an 06 Grand Cherokee 3.7L. I had some misfires and got the ignition coils/sparks plugs replaced and the fuel injecting systems (after driving on the highway for 30min). I took the car back home from the shop and everything was okay. However, yesterday the shaking during idling issue came...
  19. Engines & Drivetrain
    I'm no mechanic and this 4 cyl. 2.4 L 2003 wrangler has some ghosts, so it should be a fun project. I just towed it back to Salt Lake from the desert where a small shop and dealer both looked at it shortly without figuring it out. Any input is much appreciated :) Symptoms... 1) Won't start...
  20. TJ Wrangler Technical Forum
    Filled up with fuel 2 weeks ago and when I left my Jeep stalled out. Restarted and the CEL was lit and the engine was misfiring. I assumed it was water in the fuel and added HEET, but that did not help. Replaced the coil pack, spark plug wires, and spark plugs the next day, and still had the...
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