Mechanics

ENGINE IDLE ERATIC WHEN STARTED COLD

2000 Ford Expedition • 90,000 miles

No codes, runs great after warmed up
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Tsnake
December 31, 2011.




Check fuel pressure and for vacuum leaks.

Rivermikerat
Dec 31, 2011.
Thanks will check further but didn't find any leaks before and would think that the fuel pressure would tend to be lower when hot if the pump was starting to fail.

Tiny
Tsnake
Dec 31, 2011.
Resistance in wires is higher when cold and lower when hot. If the internal resistance of the pump has increased, the cold wires can make it worse.
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Rivermikerat
Dec 31, 2011.

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