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We have our 2004 Ford Explorer at the dealership due to cold start issues. They replaced all the plugs. We ended up taking it back for the same problems. They cleaned the throttle body and reset everything. They took it out for a test drive and it died on them. They said it was the catalytic converter. We replaced that. We went to pick it up and it will not start. We left it over night and they said it started up this morning. They think we have a bad fuel pump relay switch. Help! We don't want to keep spending money if that isn't the problem.

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  • 4buckfamily Dec 11, 2009

    Yes, if it has been sitting overnight or for a long time out in the cold. Usually when temps dip below 40's

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Does it work when the car is warm? Or do you have issues with starting when the engine is warm too? Many starting issues on OBD2 cars (which are all cars 1996 and newer) are related to the coolant temperature sensor - it helps the computer know whether the car is warm or cold, and the computer determines the proper air/fuel mixture based on this. If the sensor is faulty, it can give incorrect readings to the computer, which will cause the fuel mixture to be incorrect for starting the engine in its given condition.

Posted on Dec 11, 2009

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