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ENGINE IDLE ERATIC WHEN STARTED COLD
2000 Ford Expedition
No codes, runs great after warmed up
Saturday, December 31st, 2011 AT 5:20 AM
Check fuel pressure and for vacuum leaks.
Saturday, December 31st, 2011 AT 5:39 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.
Saturday, December 31st, 2011 AT 6:00 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.
Saturday, December 31st, 2011 AT 7:42 AM
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