Auto Parts and Repairs
Check Engine Light
Ford Ranger XL
Ford Ranger XLT

Why would a 1991 Ford Ranger Check Engine light come on only after the car has been running on the road for about 3 to 5 minutes?


Top Answer
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Wiki User
2004-11-29 06:27:32
2004-11-29 06:27:32

It goes into closed loop mode, and one of the sensors is not inputting the info the PCM needs.


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No, check it after the engine has not been running for at least 15 minutes.

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Disconnect the negative battery cable for 30 minutes.

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Check your vacuum lines this usually the cause for a surge in engine speed when idling or running.

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Check the engine RPM. If the engine is running too fast when you put it into drive, it will cause the vehicle to jump.

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Diagnosis: Engine Won't Start or RunCheck related link below

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