gas

Asked by Jul 03, 2016 at 03:16 AM about the 1991 Ford F-150 XLT Lariat 4WD SB

Question type: Maintenance & Repair

changed filter,new gas,new plugs,new cap,injeckter cleaner,new oil stills runs like it has a plug missing smells bad when  running .

2 Answers

65,515

Get the engine computer trouble codes read. This is usually a free service at most auto supply stores. You may have a bad O2 sensor or other issue.

83,925

You would have trouble finding someone to read the trouble codes since that is a OBD1 computer in there. What kind of smell? Oil? I would start by checking the compression of the engine.

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