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Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
Don't know why I didn't think about the fuel pump... it has whined for the last 7 yrs that I have owned it and per the P.O. 2yrs prior to me owning it.
A bad O2 sensor should allow the vehicle to still be driveable, just use more fuel and possibly not run as smooth? Correct?
1993 2 door 4x4 4.0 5 speed
1997 4 door 4x2 4.0 auto RIP 6/6/2016
2000 4 door 4x2 4.0 auto
Day of Dirt Adventure
Super Moderator
Re: Intermittent misfire
It would start and run for awhile then possibly not run at all when the engine starts relying on it for information. I think it would be a mater of just a couple of minutes or until it reaches operating temp
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
Anyone want to disconnect their O2 sensor and drive around and see what happens for me?
1993 2 door 4x4 4.0 5 speed
1997 4 door 4x2 4.0 auto RIP 6/6/2016
2000 4 door 4x2 4.0 auto
Day of Dirt Adventure
Super Moderator
Re: Intermittent misfire
On a Renix it won't run at all. Not sure on a 93
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
Changed fuel filter and removed cat (bunch of crap poured out of it)... still no change. Seems that it is backfiring out of the exhaust. Next Will check fuel pressure....
1993 2 door 4x4 4.0 5 speed
1997 4 door 4x2 4.0 auto RIP 6/6/2016
2000 4 door 4x2 4.0 auto
Day of Dirt Adventure
Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
Ran codes though I never got a check engine light and got the following...
12- battery disconnected within last 50 key strokes
75- ????
73-???
33- a/c relay? I don't even have a/c..
24- TPS
41- Alternator...
21- o2 sensor
I disconnected battery and tried again and got all the same codes except 41 and 21....
:/
Last edited by prerunner1982; 08-07-2014 at 10:06 PM.
1993 2 door 4x4 4.0 5 speed
1997 4 door 4x2 4.0 auto RIP 6/6/2016
2000 4 door 4x2 4.0 auto
Day of Dirt Adventure
Super Moderator
Re: Intermittent misfire
O2sensor will probably show up again later. TPS is of interest though too
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
I seem to remember someone mentioning the tps early on.... lol
1993 2 door 4x4 4.0 5 speed
1997 4 door 4x2 4.0 auto RIP 6/6/2016
2000 4 door 4x2 4.0 auto
Day of Dirt Adventure
Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
yep tps can play heaps of little mind games on our jeeps ....
keeping it red........
I DRIVE A BARBIE JEEP
Originally Posted by bigjim350 View PostOriginally Posted by XJ4IV
Think I would go that crazy too if my Jeep turned white
http://www.youtube.com/watch?v=XGg0C...eature=related
XJ where
Re: Intermittent misfire
Just throwing this out. But how old is your battery? I had a 5 yo battery in my 2000 and it started really acting up. Put in a newer battery and she's been fine ever since.
"Acting up" - would cut in and out, which felt like it might be misfiring. Would not idle. Those are the 2 most obvious problems I remember.
Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
TPS and O2 sensor replaced.... No change. Still runs rough, sometimes idles rough, backfires through exhaust, smokes, and has heavy fuel smell.
1993 2 door 4x4 4.0 5 speed
1997 4 door 4x2 4.0 auto RIP 6/6/2016
2000 4 door 4x2 4.0 auto
Day of Dirt Adventure
Super Moderator
Re: Intermittent misfire
Any CEL now or codes?
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Level: Uber Jeep Cherokee Trailer Queen
Re: Intermittent misfire
12- battery disconnected within last 50 key strokes
75- ????
73-???
33- a/c relay? I don't even have a/c.
35- fan relay (New code, but I don't have an e fan...was taken off prior to my ownership due to accident)
Last edited by prerunner1982; 08-08-2014 at 10:05 PM.
1993 2 door 4x4 4.0 5 speed
1997 4 door 4x2 4.0 auto RIP 6/6/2016
2000 4 door 4x2 4.0 auto
Day of Dirt Adventure
Super Moderator
Re: Intermittent misfire
I have to admit I a little stumped on this one
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Level: Cherokee XJ
Re: Intermittent misfire
Check the plugs. Insure the wires are routed correctly. Smoke test for vacuum leaks. I had a colorado work truck do this same stuff ended up being the ecm. Seal dry rotted and moisture got inside and caused major head scratching. Im old school and seem to check to vacuum system constantly. Timing is correct im assuming?
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