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Idle drops when first cranked???

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Old May 23, 2005 | 11:06 AM
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Idle drops when first cranked???

Idle drops when first cranked, then idles back up before stalling... Any ideas?
 
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Old May 23, 2005 | 01:26 PM
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What year, engine? If new enough, could very likely be the IAC. (Idle Air Control valve).
 
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Old May 23, 2005 | 02:07 PM
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Thanks!
This is on a 1992 XLT, with a 302, auto, 81k miles - other than the drop in idle when first cranked, it idles and runs extremely smooth.
 
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Old May 23, 2005 | 02:15 PM
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Sounds like a dirty or malfunctioning IAC as Billybob mentioned. Best thing to do is to see if there are any codes stored in the computer. I can only assume that the CEL (check engine light) comes on when it dies. There should be some indication in the computer codes as the the source of the problem. If you have a Haynes manual the procedure for pulling the codes is there. If not check www.fordfuelinjection.com. This will eliminate a lot of guesswork when trying to troubleshoot the problem.
 
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Old May 23, 2005 | 02:30 PM
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greystreak92,
It never actually dies, the rpm's drop real low(like it's going to die), but then they pick back up and it idles fine.

Could I have the codes read at AutoZone on my '92?
 
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Old May 24, 2005 | 02:18 AM
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AFAIK yes, you can. If not, all you really need to pull them yourself is a paperclip. A Haynes manual will deliniate the procedure from there.
 
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