ENGINE IDLE ERATIC WHEN STARTED COLD

2000 Ford Expedition

Tiny

tsnake

December, 31, 2011 AT 5:20 AM

No codes, runs great after warmed up

FOUND 11934 RELATED QUESTIONS

3 Answers

Tiny

rivermikerat

December, 31, 2011 AT 5:39 AM

Check fuel pressure and for vacuum leaks.

Tiny

tsnake

December, 31, 2011 AT 6:00 AM

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

rivermikerat

December, 31, 2011 AT 7:42 AM

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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