cold start/idle problems | Ford Explorer Forums - Serious Explorations

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cold start/idle problems

ppm

New Member
Joined
June 6, 2007
Messages
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City, State
adelaide
Year, Model & Trim Level
2000
2000 4ltr. explorer has prblem with cold start. runs very irratic at idle, checked fault codes and revealed 02 sensors lean, checked data from ecu and as soon as coolant temp reaches approx. 46deg.c, idle ok. Checked air/fuel ratio and noted when cold very lean 20:1 hot 14.7:1 perfect. Has anybody had this issue and any advice for repair
 






Welcome to this forum! It might be a bad engine coolant temperature sensor. Here is a troubleshooting chart:
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Welcome to Explorer Forum! Hope you get it figured out!
 






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