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  1. TJ Wrangler Technical Forum
    my 2001 wrangler (4.0 straight 6) has had the p0303 and p0304 codes for over 2 weeks now. i have replaced the spark plugs, coil rail, and now the fuel injectors. i searched for vacume leaks and found 2 (not a well versed at home mechanic so i dont know everywhere to look) and sealed them up...
  2. TJ Wrangler Technical Forum
    Hello all, I have a 97 Tj 4.0 straight 6 and have been trying all summer to get it to pass emissions so I can use it when I go back to college. So first I'll describe the problem and then list everything that has been replaced trying to chase this issue. The Jeep has only been sitting since...
  3. New Members/Introductions
    Hey guys! I just recently bought a 01 Jeep Cherokee in the salt lake area and I’m having trouble diagnosing what went wrong after trying to upgrade my injectors. I bought the upgraded 4 hole injectors and they started to cause a misfire and leaked gas into my oil from cylinder 2. I swapped the...
  4. Engines & Drivetrain
    i have a 92 jeep Cherokee with the 4.0. 245** miles its making a knocking noise, i sounds almost like a ticking. dosent go away when it warms up or when i give it some gas. i cant tell if its coming from the valve train or the pistons, but it definitely sounds like its coming from the back...
  5. Engines & Drivetrain
    Ok so i have a 98 xj and i recently rebuilt the engine. DNJ full rebuild kit, header, high flow cat, and flowmaster 40. Now that the engine is back in it runs horrible, when i start it it feels like it has a race cam in it and runs extremely rich. the tach bounces around and if i try to rev it...
  6. ZJ Grand Cherokee Forum
    Hey Guys: I upgraded my Grand Cherokee Laredo 4.0 by incresing the size of the throtle body (BBK) added bOSCH three port fuel injectors and randomly is giving me missfires everywhere. I noticed that the connectors for the Fuel injectors do not fit right and I had to hold them down with zip...
  7. JK Wrangler Technical Forum
    Hey guys, i have a 07 JK with the notorious (for reasons) 3.8L engine in it, I've had issues for a few months with random misfires via CEL and specific but milder misfires on cylinder 4(so says the CEL p0304 i believe). Of course this was right before I was about to head south after retiring...
  8. XJ Cherokee Technical Forum
    2000 Cherokee Classic 4.0. 20,000 on the rebuild. Been chasing a problem for some time now. Cam and Crank sensor codes, intermittent miss fire codes, rear O2 sensor code. Fuel pressure is 45psi. Intermittent power loss when driving, at time it losses all power. I dump into Neutrals, turn...
  9. YJ Wrangler Technical Forum
    Ok so this is a long story and I'll try and keep it to the point Got the jeep a year ago for cheap was a mess ..... Now that I have it Running one last thing is wrong ... It stutters on the freeway and a little bit When I shift from 2 to 3 when I'm gunning it.. 93 jeep yj 2.5 Parts I have...
  10. YJ Wrangler Technical Forum
    Hello fellow Jeepers. Ive got a strange issue and Im hoping somebody can help me find something maybe I have over looked. Ive owned my 1995 YJ for three and a half years. I bought it with 216,000 miles on it, and it now has 240,000 miles on the odometer. In that time Ive been using it as a...
  11. TJ Wrangler Technical Forum
    Hey guys I'm running a 2000 tj 4.0 140,000km I changed out the spark plugs and threw in some Champion 438 RC12ECC copper plugs which are the same ones I ran before, gapped them to .35. Took the jeep out all day and it seemed to run great. Then the next day I fired her up and bam.. Rough idle...
  12. Engines & Drivetrain
    Gents & Ladies My 2004 WJ Overland is showing a reoccuring cylinder 1 missifre code and engine light. On a cold start, it idles very rough, shutters and shakes. After about a minute, the shakes go away and it sounds normal. I've had the plugs changes, injectors torn apart and cleaned, and the...
  13. TJ Wrangler Technical Forum
    I have a '99 TJ with a 4.0, 140k miles and up until now have had very minimal engine trouble. When I Parked my jeep at the airport two weeks ago everything worked fine, but when I got home I had tons of trouble. I first noticed a problem when shifting up to fourth gear when all of a sudden the...
  14. XJ Cherokee Technical Forum
    I've done almost everything to this jeep and now after it heats up or driven for 20 min, as soon as I hit 2900 RPM this the jeep miss fires and "jerks". refer to: http://www.jeepforum.com/forum/f11/started-common-cps-ckp-failure-now-completely-out-hand-1386981/ and...
  15. KJ Liberty Forum
    I have searched through the postings here and don't see an identical issue. My libby just died while idling in my son's school parking lot. I got it restarted but had to really work the throttle to keep it running. Definate miss, limped it home and did what most of the other postings said...
  16. KJ Liberty Forum
    I have a 03 Liberty V6 3.7L and When I got it it had a Misfire on Cylinder 4.I just thought it needed a spark plug change no big deal it ran great.I changed all spark plugs and the Check Engine light went off and it ran like a dream.About a day and half later the light came back on.It now had a...
  17. WK Grand Cherokee & XK Commander Forum
    Greetings, I am sorely in need of a very large hammer! This 2006 wk with a 3.7l desires the true death. It misses at idle and only idle. Increase the rpm by 25revs and it dissappears. Let me back up and give you some short history. Cyl. 2 stores a P0302 code. Swap out plugs and exchange coil...
  18. WK Grand Cherokee & XK Commander Forum
    2006 3.7L Grand Cherokee has the p0302 missfire cyl#2 stored. The heads were rebuilt. Coils swapped and plugs replaced. This jeep has a low speed missfire, plenty of power off idle though. I guess I will go find a drb3 but really this is annoying!?#! Anyone had this particular problem? Looks...
  19. TJ Wrangler Technical Forum
    About 3 weeks ago i started getting missfire codes on my 4.0 TJ. Since that time the problem has gotten worse and now has no power at highway speeds. The code thrown is sometimes is cylinder 2, sometimes 3. in the drive way its fine at any RPM and will rap up with out any problem. Under Load...
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