Very weird misfire - stumped/help please..
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,460
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From: Dayton, Ohio
Year: 1992
Model: Comanche
Engine: 4.0
Just thought id jump in real quick and say that's its 95 out right down and I've been drive around town(stop and go, nothing over 30/35 cause of traf) and the light has not come on. Althought it came on when I was going to practice today, when it was 76 out. (7am)
Edit: I'll read and post back when I get home, I can only do so much at stop lights hahahah
Sent from my Droid using my mind
Edit: I'll read and post back when I get home, I can only do so much at stop lights hahahah
Sent from my Droid using my mind
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,460
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From: Dayton, Ohio
Year: 1992
Model: Comanche
Engine: 4.0
http://www.go.jeep-xj.info/HowtoCPSchange.htm
SO should I do this and go from there?
http://www.autopartswarehouse.com/sk...gs+Best+Seller
SO should I do this and go from there?
http://www.autopartswarehouse.com/sk...gs+Best+Seller
Last edited by Zack92MJ; Jul 20, 2011 at 05:13 PM.
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,460
Likes: 0
From: Dayton, Ohio
Year: 1992
Model: Comanche
Engine: 4.0
Well Ive taken it two different shops and no one can figure it out?
Does anyone have any ideas? Anyone? lol It could be your grandma for all I care, I just need some ideas on where to go next
Does anyone have any ideas? Anyone? lol It could be your grandma for all I care, I just need some ideas on where to go next
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Arghhh your best bet would be Google it. You know what the compression test does. The psi doesn't matter as much as how even it is cylinder to cylinder. The leakdown test will tell you where if anywhere you're losing compression from. Also a vacuum test. Google the procedures for these I'm sure you will get step by step instructions.
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,460
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From: Dayton, Ohio
Year: 1992
Model: Comanche
Engine: 4.0
Well I installed new neon injectors and my light was gone for more than a day..but it came back on at 41 miles
I haven't pulled the codes yet but one can assume its a miss on 1 & 2
I haven't pulled the codes yet but one can assume its a miss on 1 & 2
It sounds to me like you have the same issue i did with my xj it runs great until she heats up and you shut it off. The problem starts on restart after a heatsoak or even sometimes sitting at an idle when its hot and arent driving helping move some air. Pretty sure its in the #3 injector and theres a few posts about it not sure of the size (mm) insulator you will need but the injector is way to close to the exhaust and causes the fuel to evaporate before it can fire that cylinder. So get some kind of heat protector on the injector and im almost sure your problem will be fixed!! i would just wrap them all to insure none are getting too hot. happy jeepin hope thats what your issue is.
Thread Starter
CF Veteran
Joined: Jun 2011
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From: Dayton, Ohio
Year: 1992
Model: Comanche
Engine: 4.0
Originally Posted by braylens dad
It sounds to me like you have the same issue i did with my xj it runs great until she heats up and you shut it off. The problem starts on restart after a heatsoak or even sometimes sitting at an idle when its hot and arent driving helping move some air. Pretty sure its in the #3 injector and theres a few posts about it not sure of the size (mm) insulator you will need but the injector is way to close to the exhaust and causes the fuel to evaporate before it can fire that cylinder. So get some kind of heat protector on the injector and im almost sure your problem will be fixed!! i would just wrap them all to insure none are getting too hot. happy jeepin hope thats what your issue is.
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,460
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From: Dayton, Ohio
Year: 1992
Model: Comanche
Engine: 4.0
Well turns put I got the right spark plugs...but I got a new set and regapped one of the old ones...so I put the new one in two and the newly gapped one in one. Missfire is gone out of two. And I'm planning on putting in my other new one in one tomorrow.
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