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Reply To: 92 f150 300 6cyl. runs very rough,will not idle until warms up

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 92 f150 300 6cyl. runs very rough,will not idle until warms up Reply To: 92 f150 300 6cyl. runs very rough,will not idle until warms up

#963410
Nightflyr *
Richard Kirshy
Participant

I wonder if the MAP sensor could be bad even though new.
Would be the first time a “new” part is defective, especially if it is aftermarket and not OEM

I wonder if the MAP sensor could be bad even though new. is there an easy test for the functions of the MAP sensor.
If you can view live data from a scan tool that should help.

one other item confuses me. when the key is turned on the fuel pump engages but does not shut off. Both tanks behave this way.

Has it always acted this way?
Not sure about operation of your fuel delivery system, But if it can not retain proper fuel pressure, perhaps that is why your fuel pump is continually running.

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