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erratic idle

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Old 03-18-2018, 08:46 AM
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Location: North East TN
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Default erratic idle

99 escort se 2.0 5-speed 140k sometime the idle will run up to around 2500 rps and hold some times it hangs around 12-1500 rpm and some times its normal. Can't see a pattern and I never know when its going to do it. I suspect an IAC motor but it is not throwing any codes. Looking for ideas or suggestions.
 
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Old 03-18-2018, 09:28 AM
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Join Date: Jun 2010
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You may not be seeing any codes because,
The computer thinks it is sending the message to the IAC and the IAC is supposedly responding, but mechanically it is not . The IAC possibly is sticking and the idle is erratic. Replacing it usually gets rid of the problem.
 
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