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Rough Idle

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Old Oct 20, 2002 | 12:21 AM
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stevieray
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Rough Idle
 
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Old Oct 21, 2002 | 08:29 AM
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IH82LUZ
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From: Florence Lauderdale
Rough Idle
My truck cranks fine and idles fine for the first couple of minutes. After about 2 minutes the idle begins to fluctuate. It bounces between 500 and 100 rpm. It is a pretty consistent bounce.
I had a Mustang with a bad MAT (Mass Air Temperature) sensor and it acted very similar.
What is everyone's thoughts? Is there a way to check the sensor?
 
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Old Oct 21, 2002 | 04:31 PM
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Post Rough Idle
I recently bought a '95 F-150 4.9L, and it had a fluctuating idle when it warmed up. Turned out to be a vacuum leak (a hole in the EGR casting).
 
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