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rpmdiag, Tech and Instructor
Category: Jeep
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Experience:  Since 1975
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1998 jeep wrangler: car runs..2.5 liter engine..check engine light

Resolved Question:

my 1998 jeep wrangler wont idle down idles around 2000 and exhaust manifold is glowing red hot after car runs about 2 minutes 2.5 liter engine also exhaust flow good no check engine light on either
Submitted: 8 years ago.
Category: Jeep
Expert:  rpmdiag replied 8 years ago.

Hi fastfreight,


If you have problems like that and no check engine light on, I would be suspecting a bad PCM that is unable to diagnose itself and cause an over-richness of the system. You would have to be running VERY RICH for the manifold to get that hot. You stated that the exhaust is free, what test did you perform to conclude this?


Thanks in advance for your ACCEPT,



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