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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 09-21-2013, 07:43 PM
almonyspm1 almonyspm1 is offline
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Idle surge

92 f150 302. I had a idle surge problem pretty bad, but I fixed a vacuum leak and replaced my tps. Check engine light went off and it runs much better. However I still have idle surge, but only if I let my truck idle for a little bit or if I let it sit at idle when I start it up. If I start it up and just take off I have NO idle surge. So any ideas what this could be?
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Old 09-21-2013, 07:55 PM
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timbersteel timbersteel is offline
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Idle lope...vacuum leak.

No codes now? Run Key On, Engine Running test. How's the PCV valve? Pull the PCV valve and with engine idling, take a sheet of paper, and allow it to block flow off. Does the idle lope quit? Vacuum leak.
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Old 09-21-2013, 08:12 PM
almonyspm1 almonyspm1 is offline
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I will try that. Could it be idle air control valve?
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Old 09-21-2013, 08:27 PM
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Not necessarily. The IAC valve tries to control for a steady idle or to increase say for turning or Air conditioning compressor. I would double check ALL vacuum lines and inspect both vacuum reservoirs.

Edit: A non functioning IAC would result in low idle/stalling condition.
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