pulsating idle

Dusty waters

New member
I have a 93 xj 4.0 with a pulsating idle at start up. This is a new issue as I just changed out the fuel pump and all related hoses. The idle goes from about 900 rpm to 1100 at start up. Seems I spend more time under the hood than I do driving. The rig run fine lots of pep no power loss. If any of you have had this problem could you advise me as to the possible cause and perhaps a cure. Thanks Doug.
 

Clean your TB and IAC.
Check the connections to the IAC and TPS.
Check for vacuum leaks.
Once it warms up what rpm do you idle at?

There is a good write up called “cleaning the IAC for dummies”. It is really good.


Never look down on anyone unless you are helping them up - Jesse Jackson
 
And for future question, that is called a hunting idle. That way you will get more hits on furure searches if you wish to read more
 
Back
Top