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post #1 of (permalink) Old 08-08-2004, 12:20 AM Thread Starter
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Click noise followed by Idle Speed perturbance

91 F150 5.8l EFI

When the engine is cold, the idle speed is disturbed. There's a click sound, like the sound of a mechanical switch, then the idle will drop and speed up, then get steady. The click noise will repeat after about 10 seconds, followed by idle speed disturbance. This repeats itself during the first 10 minutes of operation, and goes away when the engine has warmed up. It is not apparent at driving speeds.

The truck has EFI. Thoughts ?
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post #2 of (permalink) Old 08-09-2004, 09:16 PM
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Re: Click noise followed by Idle Speed perturbance

could you be having trouble with your idle bypass valve on the side of your throttle body??

its held on by two 6mm screws, pull it off and check to see if its carboned up. you also may be having problems with the solenoid that actuates it , but thats where i would start looking even though the click noise sounds more like a relay, can you tell where its coming from under the hood??
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post #3 of (permalink) Old 08-10-2004, 02:02 PM
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Re: Click noise followed by Idle Speed perturbance

First thing I would do is check for trouble codes. Alot of times the code will refer you to a sensor thats got a bad connection and/or a unplugged vacuum hose. I highly recomend spending the $25 on a code reader from your local parts store. The codes can be retrieved without it but the book that comes with it is worth the $25. Plus its alot easier to retrieve codes without someone helping you when you have the reader. If you don't want to buy one I can post how to retrieve the codes on your model which requires a paper clip and an analog meter.
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