Jump to content

High idle when first started?


Recommended Posts

Most likely it is the IAC. You need to remove the throttle body, take the IAC and TPS off of the throttle body, clean it REALLY well, clean the IAC shaft seat, and then reassemble everything. You will have to set the TPS back to proper specs when you are done. CLICK HERE for the how-to on the TPS adjustment.

 

If that doesn't fix it, then the IAC is probably going bad.

Link to comment
Share on other sites

Has anything changed with this vehicle before the problem arose? I mean have you changed or altered anything recently?

 

A manifold vacuum leak will also do this BTW...

CW

True, and I had an issue where I changed the battery cables, and moved the ground to a different spot, which caused a severe high idle problem on mine.

Link to comment
Share on other sites

My 87 4.0L would do this all the time was driving me crazy constantly blipping the throttle trying to get it back down, was like constantly on the choke mode, sometimes would go back down. Once I replace all the fuel injectors with new 4 port (instead of 2 port) idles like a dream, gas mileage improved, and more power! :cheers:

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...