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2002 Windstar misfire on 4 cylinders P0302, 03, 04, 05

Discussion in 'Engine, Transmission/Axle & Driveline/Axle' started by robb, May 13, 2017.

  1. robb

    robb New Member

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    A friend's van has a hard time under load (very noticeable climbing a hill or accelerating from a stop, duh).
    I've scanned and erased codes 4 days in a row now. Misfires on 2, 3, 4, and 5 have come up. 3 and 4 more often that 2 and 5. Never 1 and 6, which may be a clue since they are on the passenger side of the engine. I was thinking partially blocked EGR ports, but then that should be the opposite - mostly 1 and 6, right?

    Since it's semi random cylinder(s) I don't think it's an individual cylinder problem (plug, wire, injector), but something common - fuel filter, fuel pump, MAF, O2 sensor, coil pack?).
    I've replaced the fuel filter (some improvement), and tomorrow I will remove the EGR line to be sure partially blocked EGR ports aren't the problem.
    What other testing can I do to narrow down what's causing this?
    Last edited: May 13, 2017
  2. Dominick 1

    Dominick 1 Well-Known Member Respected Member

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  3. robb

    robb New Member

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  4. Action

    Action Moderator Staff Member Respected Member

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    How many coil packs does it have?
    What is vacuum reading at idle?
    Have you done a compression test?

    >>>Action
  5. robb

    robb New Member

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    One ignition coil. I don't think my scanner shows vacuum, and don't have a vacuum gauge. Don't have a compression tester, and couldn't get to the cylinders by the firewall anyway.
  6. Dominick 1

    Dominick 1 Well-Known Member Respected Member

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  7. Action

    Action Moderator Staff Member Respected Member

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    Too bad because a vacuum gauge is a great way to discover over all running condition. A compression gauge is a good tool for over all engine health.

    The electronic engine control system is picking up a symptom. Could be a lean misfire due to ignition or vacuum leak or lean fuel mixture.

    Fuel mixture could be O2 sensor. You didn't state how many miles on engine. If over 100,000 miles I would replace the O2 sensor just as a maintence item. May fix the issue as well. Or dirty air filter

    Vacuum leak could be a lot of things.

    Ignition would be limited to spark plugs, wires and the coil.

    >>>>>>>>Action
    Last edited: May 13, 2017
  8. robb

    robb New Member

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    I cleaned the PCV, replaced the leaky grommet, took the EGR line off and no difference - so wasn't the EGR ports. Replaced the plugs, wires, and coil, and it runs like a champ!
  9. Dominick 1

    Dominick 1 Well-Known Member Respected Member

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    Thanks for posting the results

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