Question about 1992 Chevrolet K1500

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Engine miss when ambient air temp increases not water/engine temp

I find that when the ambient air temp increase like in the summer. My 92 K1500 150 k develops a miss in the engine, which become more previlent when at a stop light in drive with brake applied. I have check and/or replaced plugs, wire, O2 sensor, computer temp sensor, and had the FI cleaned. The problem has been going on for sometime and is significantly less in the winter time when the temp. is lower. Is there an ambient air temp sensor as part of the ingnition control or FI system that could cause this problem? Or has any one heard of the FI / ignition computer have problem in higher ambient air temp. It doesnt take much 75F ambient air is enough to have a proplem. My belief is that the problem my be in fuel injector computer control that is not compensating for the rise in ambient temp. But I don't know of a why to verify this. Local Chevy dealer found nothing wrong other than a leaking valve cover and dirt anti-freeze which cost $100.00 to tell me. Thanks Chevy dealer.

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  • kflannery Jun 17, 2009

    In regards to the craked distributor shaft. Would that be that sensitive to ambient air temp? I would think it would be conditional on the engine temp which doesn't really seem to be the case. I feel a significant differance between driving into work in the morning and driving home in the evening. Thats the wierd part the only real difference is AMBIENT temp other than I am much more awake on the evening commute than the morning commute. Thanks for your suggestion I will pull the distrubutor and take a look anyway. FYI I replace the distrubutor pickup about five years ago when it completley failed but my experience with them is they either WORK or DON'T WORK. Thanks again

  • Anonymous Mar 12, 2014

    air ambient temperature sensor location?

  • Anonymous Mar 17, 2014




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There is an ambient temp. sensor in the intake air ducting, if its a small round two wire plug you can unplug it and the computer will think its -40C. You will set a code when you do this, but should go away after you plug it back in.
Depending on the engine you could have a cracked mainshaft in your distributor which is quite common, unfortunately most cracks are on the underside of the shaft which requires removing the distributor.

Posted on Jun 16, 2009


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