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Early morning starting

jeepcherokee95

NAXJA Forum User
Location
Missouri
I have a 95XJ 4.0 and aw4 trans. the other day it started in with a rough idle when you first start it in the mornings but after you give it some gas and start to drive it clams down and drives normally; if it were carburated I would say it was choking out, that's exactly what it is doing though.

I am hoping someone can help me with where to look and what to do.


thanks in advance!

JC95
 
You should clean the TB (throttle body) and particularly the IAC (idle air control) stepper motor passage. After that, do a good HOT throttle plate idle adjustment with IAC fully closed and disconnected. Followed-up with adjustment of the TPS (throttle position sensor) per FSM (factory service manual).
If this doesn't help, do a search for rough idle. There are at least 6 posts that cover this type of problem.
 
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