Question about 1989 Ford F 250

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Have a 1989 f250 5.8 that didnt pass smog the guy told me its running rich the report said the HCdidnt pass just by a few numbers everthing else passed so i put plugs cap wires o2 sensor and a new brake boosterno it runs worse than it did it now surges going down the road like it has a short or a fuel pump problem

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Would double check your firing order on your cap.If running worse almost positive some wires were crossed.The spark plug firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) and runs counterclockwise on the distributor cap.

Posted on Jun 01, 2010

  • Jonathan S
    Jonathan S Jun 01, 2010

    In addition to the hydro carbons from the emissions testing excessively dirty oil or fuel in the oil will affect this reading.When going to emissions testing make sure to do it on a fresh oil change and oil filter. If the hyrdo carbons are that close to passing it may make a difference.

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