bilgamesh Posted November 15, 2008 Share Posted November 15, 2008 I bought my Comanche a couple weeks ago. I had trouble getting it to start properly at first until I read some of the posts about the computer needing several revolutions of the engine to calibrate itself. Now it turns over a few times and starts right up. About once a week, at low speed, or at a light, it will die. I wonder if this is a computer going out? Please let me know your thoughts and experience. Thanks, Bill Link to comment Share on other sites More sharing options...
Eagle Posted November 15, 2008 Share Posted November 15, 2008 Does it start right up again? Link to comment Share on other sites More sharing options...
Pete M Posted November 15, 2008 Share Posted November 15, 2008 Does it sputter and die? Or just shut off like you turned the key? Link to comment Share on other sites More sharing options...
bilgamesh Posted November 15, 2008 Author Share Posted November 15, 2008 1990 model 4.0 L; No sputtering just dies, and will restart. Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted November 16, 2008 Share Posted November 16, 2008 auto or manual? Link to comment Share on other sites More sharing options...
bilgamesh Posted November 16, 2008 Author Share Posted November 16, 2008 It is an automatic. Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted November 16, 2008 Share Posted November 16, 2008 I'm leaning toward your IAC is bad. Have you checked it lately? Link to comment Share on other sites More sharing options...
BLHTAZ Posted November 16, 2008 Share Posted November 16, 2008 Could be a CPS issue, but it's not real common for them to be intermittent like that. It would be easier to diagnose on your part if it would not start again right away, but if it restarts immediately...it may be tough to find. Link to comment Share on other sites More sharing options...
bilgamesh Posted November 16, 2008 Author Share Posted November 16, 2008 OK, thanks for the replies. I searched and found a cleaning of the IAC may be something to try. I will give it a shot. Incidentally, the truck has 123K miles on it. Link to comment Share on other sites More sharing options...
summerinmaine Posted November 16, 2008 Share Posted November 16, 2008 OK, thanks for the replies. I searched and found a cleaning of the IAC may be something to try. I will give it a shot. Incidentally, the truck has 123K miles on it. Different vehicle (4Runner) but with the same symptoms (and the fact that I could shift into neutral and keep the revs up to prevent it dying), the IAC needed cleaning. Good luck! Link to comment Share on other sites More sharing options...
maddzz1 Posted November 16, 2008 Share Posted November 16, 2008 iac is my guess too. Link to comment Share on other sites More sharing options...
BLHTAZ Posted November 16, 2008 Share Posted November 16, 2008 I guess if it is stuck shut, the IAC may cause this, but again...stuck shut is another rare occurrence as it is typically sticking open causing a high idle. Let us know what happens... :cheers: Link to comment Share on other sites More sharing options...
bilgamesh Posted November 16, 2008 Author Share Posted November 16, 2008 It occasionally does start up and idle a little higher than I would expect. I haven't looked at it yet, so I am not clear about what cleaning entails, but maybe the thing is a little sticky both directions. I will look at it today and report back. Link to comment Share on other sites More sharing options...
bilgamesh Posted November 16, 2008 Author Share Posted November 16, 2008 I removed the wire clip, removed two Torx bolts and pulled the IAC out. It was covered in carbon deposit, and I am not sure how much the thing articulates, but it did not look like anything that would cause it not to move. I put it all back together, and I guess I will see if my mysterious dying repeats. Incidentally, I could not detect any vacuum leaks or other loose wires. I did notice my battery ground was a little loose, but not to the point where I think it would lose contact. I would appreciate any more thoughts. Thanks, Bill Link to comment Share on other sites More sharing options...
BLHTAZ Posted November 16, 2008 Share Posted November 16, 2008 You would be quite surprised as to how sensitive these things are to ground issues. I had a high idle (3000 rpm constant) and I finally found out that it was because I moved my battery ground from it's original spot on the engine block to a different spot. As soon as I put it back in the original spot, my troubles were gone :shake: . I had replaced the IAC, TPS, CTS, MAP, EGR Valve, EGR Solenoid, vacuum hoses etc, etc... and was about to replace the ECU when I discovered the problem :wall: Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted November 16, 2008 Share Posted November 16, 2008 I'm still with IAC. I had the exact same symptons on a 96 VW. Changed out IAC. Problem fixed. Link to comment Share on other sites More sharing options...
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