88 mustang LX 4cyl idle problem? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 2 (permalink) Old 04-07-09, 05:24 PM Thread Starter
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Join Date: Apr 2009
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88 mustang LX 4cyl idle problem?

So basically whats happening is:
You start her up and it idles high for about 2 - 3 seconds then holds correct idle for about 5 mins while driving. After the engine gets warm she starts to drop rpms bouncing from around 450 - 750, somtimes stalling out.

Other things are seat belt alert doesn't work, also Im pretty sure the engine light indicator and low fluid indicators do not work.

Does this sound like a circut problem or fuel distribution problem?
Any help or input would be greatly appreciated. Thanks.

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post #2 of 2 (permalink) Old 04-08-09, 08:19 AM
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Re: 88 mustang LX 4cyl idle problem?

Clean the throttle body with an appropriate chemical and old toothbrush, get as much of the black soot off the bore and throttle blade as possible. I usually remove the IAC valve and clean it as well. I have assumed the tune up (plugs/ wires/ cap/ rotor are all good) swap in a new PCV valve, I prefer a Ford PCV valve (have had idle issues using aftermarket stuff) and finally check your ignition timing. Once these items are taken care of, all should be good. If the problem persists you will have to start looking deeper.
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