what could be cause of power loss on a 4.9 6 cyl 1990 model

Asked by May 15, 2017 at 02:44 PM about the 1990 Ford F-150 XLT Lariat SB

Question type: Maintenance & Repair

1 Answer


Almost anything. Maybe it needs a tuneup and filter change. Low compression or a clogged up catalytic converter will cause major power losses. Dirty fuel injectors are also a possibility.

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