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Old 05-21-2011, 04:48 PM   #1 (permalink)
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97 4cyl TJ stalls during warm up, runs rough

I recently bought a 4cyl 5sp 97 TJ. It starts up and seems to run ok, but then begins to sputter and eventually die within 1 minute after cold startup. It usually starts back up easily, but then goes through the same process again and again.

On a few occasions, it has done the 300rpm barely running sputter deal while I am on the road. I have to give it all kinds of throttle to keep it running, and sometimes it still dies. Last week, it did exactly what I described above, then let off about 5 of the most amazing backfires I have ever heard (then died and would not re-start). I smelled plenty of unburned fuel, and eventuall was able to re-start it by pulling spark plugs and cranking away the excess fuel.

Any ideas where to start?
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Old 05-21-2011, 07:43 PM   #2 (permalink)
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Does it have a check engine light??

-Could be a crank position sensor starting to go
-mass air flow sensor
-loose throttle body

A code will tell you a lot more!
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Old 05-21-2011, 08:56 PM   #3 (permalink)
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Mine did almost exactly the same thing and I had no CEL. It was the upstream o2 sensor. I still dont know why it didnt throw a code but it runs great now...
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Old 05-22-2011, 06:09 PM   #4 (permalink)
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No check engine lights, but I did get the stored codes. It had the O2 code as well as cylinder misfire, and battery disconnect.

\I just changed the 02, and it seems to be running great now!
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