wranglercory Posted August 17, 2010 Share Posted August 17, 2010 I have a 87 MJ with a 2.5L AX-5 trans and just the last two days Ive had a problem with the idle being to high. I have done nothing to the truck and it just started to idle high yesterday. I tried swaping the injector it is a throttle body injection system. Does anyone have an idea what could be causing this to happen. I was thinking it is the sensor on the rear of the throttle body but not sure I tried disconnecting it last night when I got home but didnt seem to change anything I did disconnect it while it was running. Any help would be great. Link to comment Share on other sites More sharing options...
Pete M Posted August 17, 2010 Share Posted August 17, 2010 look for vacuum leaks. :thumbsup: Link to comment Share on other sites More sharing options...
wranglercory Posted August 17, 2010 Author Share Posted August 17, 2010 forgot to add that the truck sat idle for two days, then problem started on the third day when I started it and went to work. Ive used starting fluid, to see if there was a leak just in case but no leaks. Link to comment Share on other sites More sharing options...
1987Comanche Posted August 17, 2010 Share Posted August 17, 2010 Bad Idle Speed Controller. Link to comment Share on other sites More sharing options...
wranglercory Posted August 18, 2010 Author Share Posted August 18, 2010 I wondered if the ISC was the problem I have messed with it a little and looks like it could be it. Ill have to check online and find one. Link to comment Share on other sites More sharing options...
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