cel flashing 89 f250 460 - Ford Powerstroke Diesel Forum
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Old 04-17-2012, 04:57 PM
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cel flashing 89 f250 460

i have an 89 f250 4x4 with a 5 speed. when i got it it wouldnt warm up and got horrible mileage. i replaced the thermostat, then the coolant temp sensor. warmed up quicker and got better mileage. but since then i have noticed the check engine will flash when cruising, and lightly accelerating. it doesnt do it when its fully warmed up or dead cold. just when its in between. i havent been able to get any permanent codes to read.

any ideas????
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