Thread: Fuel Trim
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Old 12-08-2013, 07:35 PM
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BassFantasizer BassFantasizer is offline
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Well this went an entirely different direction than I had expected.

I replaced the fuel pressure regulator and all of the lean issues seem to have resolved. I've put about 2 hours on the truck since then, with absolutely no indication of a problem.

Two different Ford mechanics told me that the pressure regulator had tested OKand in good-natured fashion laughed at me when I told them that I was going to change it. "That's a waste of money. The regulator tested out fine". (3 fuel pumps and 3 filters later, I replaced the $30 part.....)

Apparently, they're not just pass/fail as long trim now varies from -3 to +3, where it was locked in at +25 before.


~Bass
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