Question about 1990 Ford F150

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Truck running funny sometimes and other times running perfect.

My 1990 Ford F-150 5.0L 4X4 with 155,000 miles has an issue. A couple years ago I had my fuel regulator replaced because it was running crappy. Now it seems to run great at times and other times it seems to miss, have power loss and chug. It has a new fuel pump, filter, and spark plugs. Not sure what to do other than replace fuel regulator again because when I sniff next to the engine with the hood closed I can smell a lot of fuel and there are no leaks. seems like the regulator is dumping way more fuel than the engine needs and its causing it to run rough and have waves of power loss as I accelerate up to speed. Doesnt always happen. Its about 50/50 now. Any advice??

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If the exhaust blows black when this issue starts,then probably a bad regulator,which the check engine light will come on then go off a few times telling you a code,oxygen sensors...if not,try replacing the throttle position sensor,its tough because its at the bottom of the throttle body,and the screws rust in and sometimes breaks,so the throttle body has to come have to figure out where the gas smell is coming from at least,it could be blowing back into the air breather.also check the vacumn lines(green hose and red hose) on top for cracks.the red should be for the regulator

Posted on Dec 12, 2009


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