92 f150 4.9 running on 3 cylinders getting gas & spark I unplug 1st 3 plugs and nothing changes
10

Asked by nodave555 Jun 21, 2014 at 09:17 PM about the 1992 Ford F-150 S LB

Question type: General

2 Answers
57,965

Tracy answered 9 years ago

Basics - Basics - Basics. Compression test, Vacuum leaks (especially the 4.9L with 70 pounds of manifolds hanging on side of the motor), Plugs and wires (as mentioned). A knowledgable technician with proper diagnostic skills would help too. You've posted this one before haven't you?

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