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Own a 1992 ford explorer. idles rough and surges. bucks at low speeds in low gears. have replaced fuel filter,o2 sensor and idle control valve. where to next?

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Off to a shop that can read the fault codes to find out exactly what is wrong and fix that

Posted on Dec 04, 2016

Testimonial: "already did that. code was for o2 sensor. Thanks though."

  • 1 more comment 
  • Bill Boyd Dec 04, 2016

    the oxygen sensor that has the major impact on performance is the HO2S ( heated oxygen sensor ) in the exhaust manifold before the cat converter
    the O2 sensor ( after the cat converter only does a final trim and reports on the cat performance and will have little bearing on your reported problem.

  • gary klette
    gary klette Dec 04, 2016

    I misstated because it actually was the HO2S that was changed. I've talked to numerous people, including shops and no one seems to know for sure. Everyone seems to just want to throw parts at it.

  • Bill Boyd Dec 04, 2016

    try checking all vacuum lines including brake booster hose and vent control hoses
    check pvc valve for correct operation
    check EGR valve and solenoid and wiring
    from your description it sounds like an air/fuel ratio problem (vacuum leak or fuel pressure too low)
    check fuel pressure with a pressure gauge
    ford explorer is also a badged vehicle from another manufacturer ( mazda or nissan ) so ask around ( other service shops )to see if others have similar symptoms
    check for moisture in the distributor cap or carbon tracking lines from the coil down the side of the cap

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