99 Mountaineer cranking problem
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99 Mountaineer cranking problem
when I try to crank the truck , it starts and emmediatly dies.
this happened several times
the last attempt I began patting the accelerator when I turned the key.
the truck cranked and I was able to keep it running by feathering the throttle. it ran rough.
at higher RPM it ran ok
when I let it idle it idled rough.
after engine warmed it idles and runs fine.
engine started without trouble when warm.
this happened several times
the last attempt I began patting the accelerator when I turned the key.
the truck cranked and I was able to keep it running by feathering the throttle. it ran rough.
at higher RPM it ran ok
when I let it idle it idled rough.
after engine warmed it idles and runs fine.
engine started without trouble when warm.
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Joined: Apr 2000
Posts: 1,746
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From: PNW
You might have a coolant temp sensor that has failed high (warm). If the sensor is reading high (in the normal range), the computer won't richen the mixture when cold. If you can get your hands on a diagnostic tool that displays live data, that would help. You might also try to measure the resistance of the sensor when cold and when hot and see if there's any difference. There should be. I don't have the specs, but I'd be willing to bet that someone here does or you can find the values if you google it.
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weswes01
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Nov 12, 2007 09:08 PM
