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Old 08-18-2005, 20:17   #1 (permalink)
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High idle at startup

Been having a bugger of a run with the Sprint lately, fuel pump, wiring, engine mounts and balancer being the main points. Since the mounts went (dodgy balancer still on) the engine vibration managed to kill the MAF sensor by snapping the connector due to a hard line hitting it.

Since then car started stalling at idle, so I troubleshooted the IAC. Cleaning did no good so I Replaced it with a brand new ford unit ($280, thanks) and the car idles ok except at startup. Now I expect the car will have some difficulties running without the MAF sensor connected, running rich etc but its at startup where the real problem lies. A few (3-5 secs) after I start the engine (hot or cold makes no difference) the idle will shoot up to between 1500-2500 for 1 - 2 minutes. It usually creeps slightly up from the original high level it goes to. Afterwards it settles into the normal warm idle level for as long as I drive the car and behaves normally when decelerating. Turn it back on and the same thing.

I have cleared the KAM by disconnectingthe battery for a while and this does not change things. I need to run the codes again but previously I was only seeing the MAF disconnected code.

Any chance the car has some form of vacuum leak that the car was compensating for while the MAF was still ok and has shown up? Otherwise I suspect its the engine management running the car hard to get the O2 sensors up to temp but as it does it when the engine is hot that would not seem to be the case.
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Old 08-18-2005, 20:30   #2 (permalink)
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Re: High idle at startup

You are running it without a MAF are you? If so get that sorted before trying to figure out the idle. Running without a MAF puts the EEC into limp home mode which means it runs damn rich (which affects idle quality), fixes timing (again affects idle) and a whole lot of other things.
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Old 08-19-2005, 07:30   #3 (permalink)
Two SC 61's = trouble
 
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Re: High idle at startup

http://www.fordmods.com/forums/viewtopic.php?t=11612

You can tune around or with any maf with that eec tuner?
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