Engine Surge
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Junior Member
Joined: Aug 2016
Posts: 2
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From: Omaha, AR
Engine Surge
1994 F150 5.0 4x4. Engine goes into high rpm (2-3K+)after warm up. Have replaced O2 sensor, ilde air bypass valve, Multiple codes came up upon testing.... 412,411, 172, 538. Check engine light went off when we replaced O2 sensor. Retested no 172 code. Also replaced the air filter. Where do we go from here?
Last edited by erler; Aug 11, 2016 at 05:28 PM. Reason: added air filter replacement note
