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Old 10-22-2006, 06:51   #1 (permalink)
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91 f150 ecu

I have a 91 f150 4.9l 5 speed and have a problem thats been stumping me for some time...it happens at idle or while i am driving...if i am at idle the check engine light comes on and if i hit the gas it stalls//also when you turn the key on when this happens the fuel pump will run all the time instead of running for the normal 3-4 seconds///if i am driving and the light comes on it will cut off unless i keep the engine above 3000 rpm///i do this by shifting to a lower gear very quickly and than keep driving////there is no specific time this happens///it could be cold hot wet dry and it may happen 5 time a day or once every 6 months//started about 2 years ago///i have replaced the fuel pump and ecu relay and it still happens///the ecu is storing no codes
any body got any ideas
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Old 10-26-2006, 07:16   #2 (permalink)
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Re: 91 f150 ecu

Suggest to make sure you don't have an intermitent ECU ground (small wire w/plug near the battery). The ECM might also be kaput, the fact that you have the CEL turning on, and not been able to access the codes is a bad sign. Check the testing procedure for a "No Codes" condition at www.fordfuelinjection.com � No Codes? . Hope this helps.
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Old 05-04-2010, 18:38   #3 (permalink)
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Re: 91 f150 ecu

hi, a friend of mine had the same thing with his 95.it turned out to be the fuel pump.
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