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Unread 03-24-2014, 05:19 PM   #1
cantfixmyheep
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Impossible cylinder 1 misfire issue

I have a '00 tj with 102,000 miles. About a month ago my check engine light popped up reading cylinder 1 misfire. Thought it was gonna be a easy fix. Anything but. Replaced plugs, coil rail, upstream o2 sensors, cam and crank sensor, tps sensor, map sensor. Compression and leak down tests came back fine. Swapping injectors didn't work. The light comes on intermittently. It will come on at low speeds or when I'm on the highway. You can't feel it miss unless you were driving high speeds for at least 10 minutes than come to a stop. It idles very hard. Sometimes it will go into limp mode. I bought it with with a warped head 2 years ago and had it machined and fixed. Brought it to a specialist and he had it for 2 days. He couldn't get it to miss and said he couldn't track the misfire unless he could get it to miss. Once the jeep is warmed up I'll do the papet to muffler trickand its constantly getting sucked it. Brought it to 2 other people including a dealership and jeep specialist and no one can figure it out. Pretty desperate for help its my daily driver and I'm worried time is making its issue much worse. Any help is much appreciated.

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Unread 03-24-2014, 05:29 PM   #2
JBTJ
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Which plugs did you install?
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Unread 03-24-2014, 05:32 PM   #3
cantfixmyheep
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Autolite copper oem plugs
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Unread 03-24-2014, 06:40 PM   #4
cantfixmyheep
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Also to note. When it goes into limp mode when I pull the codes they say cylinder 1 and 6 misfire
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Unread 03-24-2014, 07:18 PM   #5
MichJeep38
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Quote:
Originally Posted by JBTJ View Post
Which plugs did you install?
Alternator is Good? Any discoloration of the engine oil? What gap are you using? My intake/ exhaust manifold gasket was bad which was causing my engine to run extremley rough and misfire. Once I replaced the gaskets (Exhaust / Intake Manifold) everything calmed down now with 202,656 miles My idle is solid no misfires no trouble codes.
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Unread 03-24-2014, 07:29 PM   #6
Dave02TJ
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Quote:
Originally Posted by cantfixmyheep View Post
I have a '00 tj with 102,000 miles. About a month ago my check engine light popped up reading cylinder 1 misfire. Thought it was gonna be a easy fix. Anything but. Replaced plugs, coil rail, upstream o2 sensors, cam and crank sensor, tps sensor, map sensor. Compression and leak down tests came back fine. Swapping injectors didn't work. The light comes on intermittently. It will come on at low speeds or when I'm on the highway. You can't feel it miss unless you were driving high speeds for at least 10 minutes than come to a stop. It idles very hard. Sometimes it will go into limp mode. I bought it with with a warped head 2 years ago and had it machined and fixed. Brought it to a specialist and he had it for 2 days. He couldn't get it to miss and said he couldn't track the misfire unless he could get it to miss. Once the jeep is warmed up I'll do the papet to muffler trickand its constantly getting sucked it. Brought it to 2 other people including a dealership and jeep specialist and no one can figure it out. Pretty desperate for help its my daily driver and I'm worried time is making its issue much worse. Any help is much appreciated.


Put a vacuum gauge on it if the valves are hanging up the gauge needle will be bouncy.
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Unread 03-24-2014, 07:37 PM   #7
cantfixmyheep
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Mich the intake and exhaust gaskets were replaced 2 years ago when the head was done. Dave I hooked up a vacuum gauge to the brake booster vacuum line. It did bounce a lil but wasn't sure how much bounce was normal and how much meant some sort of valve issue.
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Unread 03-24-2014, 07:39 PM   #8
Dave02TJ
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http://www.jeepforum.com/forum/f9/mi...p0300-1094827/


http://www.wjjeeps.com/tsb/tsb_wj_0900303.pdf

Look at these links --- may or may not help you but you should know this anyways.
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Unread 03-24-2014, 07:40 PM   #9
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Quote:
Originally Posted by cantfixmyheep View Post
Mich the intake and exhaust gaskets were replaced 2 years ago when the head was done. Dave I hooked up a vacuum gauge to the brake booster vacuum line. It did bounce a lil but wasn't sure how much bounce was normal and how much meant some sort of valve issue.
A valve issue is around 3-4 " of vacuum bounce --- and sharp movements
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Unread 03-24-2014, 07:44 PM   #10
Dave02TJ
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Quote:
Originally Posted by cantfixmyheep View Post
Mich the intake and exhaust gaskets were replaced 2 years ago when the head was done. Dave I hooked up a vacuum gauge to the brake booster vacuum line. It did bounce a lil but wasn't sure how much bounce was normal and how much meant some sort of valve issue.
The first link I gave you, the guy talks about using a dollar bill at the tail pipe...My auto shop teacher in HS also told us to do that. If it gets sucked in a valve is hanging up.


Just stuff to check for now
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Unread 03-24-2014, 07:52 PM   #11
cantfixmyheep
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I've done the dollar bill thing. At startup it only sucks at it once in a blue moon. After driving for a while when I park it it sucks at it pretty constantly. I took a bottle of seafoam and poured half into the brake booster line and half into the crankcase. Havent really noticed a difference. But the light comes on intermittently so just waiting for it to come back.
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Unread 03-26-2014, 09:42 AM   #12
02MoabTJ
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I have posted the same exact problem, but with all cylinders except #5, I think. I'm having the mechanic do the Misfire TSB today and see if those valves are 'hanging'. I will report back by this weekend. You can see the other post on my account I think.
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Unread 03-26-2014, 04:56 PM   #13
PhulesAu
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Did you replace the connector boots? from coil pack to plug tip??
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Unread 03-26-2014, 07:59 PM   #14
cantfixmyheep
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Let me know how the service goes I was thinking of doing it this weekend as well. I've put 2 different coil rails on and they both had the same issue so it definitely wasn't the boots.
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Unread 04-03-2014, 08:31 AM   #15
02MoabTJ
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Fixed, and you wouldn't guess what...

Loose and dirty battery posts. That sent RF (noise) to the sensors and caused the ECU to send signal and limp occasionally. Well, off to the Easter Jeep Safari in Moab in 12 days!
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Totally stock '02 TJ 4.0 3.73 30x9.50 hard-top 38K mi (Fresh Meat lol)
OK that was 3 years ago...

5.5 RE Long-arm Tri-link, 4.56 gears, 35" MTRs, LoD Signature Tire-Carrier with Jerry-can holders and Safari-rack, Grande30 upgrade front / G2 Dana 44 35-spline with Disc rear same 4.56 gearing - ARB on all.
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