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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?
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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
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Re: Intermittent misfire
Anyone want to disconnect their O2 sensor and drive around and see what happens for me? :D
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Re: Intermittent misfire
On a Renix it won't run at all. Not sure on a 93
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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....
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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....
:/
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Re: Intermittent misfire
O2sensor will probably show up again later. TPS is of interest though too
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Re: Intermittent misfire
I seem to remember someone mentioning the tps early on.... lol
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Re: Intermittent misfire
yep tps can play heaps of little mind games on our jeeps ....
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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.
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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.
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Re: Intermittent misfire
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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)
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Re: Intermittent misfire
I have to admit I a little stumped on this one
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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?