Question about Ford Explorer

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92 ford explorer 4x4 4.0L .. loss of power .. smell of gas ... seems like it running rich. Replaced plugs, wires and the one O2 sensor. MAF looks clean .. don't know if it's good though. Need to check for Vacuum leaks .. guy at auto parts store told me about a coolant heat sensor?

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  • mrfrankwilli Sep 02, 2010

    This is what happened .. Came to a slower vehicle in front of me ... down shifted from 5th to 4th .. and punched it a bit .. not too much .. but after that it started to run bad .. never overheated .. never was an issue ... do you think one of the injectors could be stuck or the Vacuum system ... thanks for answering these questions .. My wife took my vehicle to Montana because its more reliable .. she's coming back and going to blame me of course .. lol



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That sounds like a possibility. Your engine management system has a cold start circuit. It is equal to a choke. It will keep the mixture rich and limit the engine spark advance. Both affect performance.

Autozone and Oreillys will do a free scan which may pick this up. You would need to change the correct sensor which is usually different than the sensor that operates the dash gauge. A "cold start" condition is a normal occcurence; the duration of the Cold start is something the scanners may not catch.

These types of problems would show up in O2 problems and Rich bank conditions after your Catalytic converter starts complaining. This should not cost much to get you back to 100%.

Posted on Aug 31, 2010

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  • mrfrankwilli Sep 01, 2010

    So last night I checked the water and oil. I smell gas in the oil ... head gasket?

  • fordexpert Sep 02, 2010

    Not necessarily. When an engine runs too rich it floods. The extra fuel can run down into the cylinder and into the oil pan. You need to change oil and filter. Once you stop the rich burn condition the gas should burn in the combustion chamber.

    If the Keyswitch was left ON, you may get extra fuel in the motor if the engine was off. I would look at the Throttle Position Sensor TPS in that event. The TPS could allow for a minimal flow if the Keyswitch was left on without the motor running. However, the TPS is actually your throttle pedal and it should only allow for idle speed gas flow without pressing the pedal. The TPS is also part of the Engine Management system and it also can be allowing too much gas into the engine. It is easy to change and is mounted on the Airhorn behind the Plastic Air ductwork.

  • mrfrankwilli Sep 02, 2010

    one more thing .. sometimes when I take the keys out of the ignition it does sometimes still beep when I open the door .. I have to jiggle the ignition switch for it to stop .. hmm ? .. Keyswitch left on? .. but it started acting up like I said after I down shifted

  • fordexpert Sep 03, 2010

    The Key situation can mean you are not shutting off the fuelpump. The downshift sounds like it can be a soot problem somewhere. You may have to use a cleaner in the fuel system to open the Injectors. Beneath the metal Airhorn on some models there is a cavity beneath the Airhorn gasket. Soot can build up and a momentary Burp can foul the EGR valve. It would be worth checking.

    As for YOU breaking the car before she went to Montana, my 4 Star solution is those pesky mice chewing the underhood wires.



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