How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask rpmdiag Your Own Question
rpmdiag, Tech and Instructor
Category: Jeep
Satisfied Customers: 6700
Experience:  Since 1975
Type Your Jeep Question Here...
rpmdiag is online now
A new question is answered every 9 seconds

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: 7 years ago.
Category: Jeep
Expert:  rpmdiag replied 7 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,



rpmdiag and 3 other Jeep Specialists are ready to help you

Related Jeep Questions