Question about 1992 Mercury Grand Marquis

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Head gasket job

Just had head gaskets replaced on 1992 mercury grand marquis. Once mechanic put car back together and started it, it made a loud popping noise. you can start it but you have to keep your feet on the gas or it will stop. it driving very ruff also.

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  • Anonymous Dec 18, 2008

    How do i tell if it is an overhead cam

  • Anonymous Dec 18, 2008

    how do i tell if it is an overhead cam and could it also be the spark plug wires because he said they weren't labeled and just put them on any way he could.

  • Roberta Smith
    Roberta Smith May 11, 2010

    the timing is off... is that an overhead cam ?



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Wow .. nice mechanic ...

Posted on Jan 12, 2009


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If you are not confident you can get it back together, don't take it apart. That being said..You could buy a manual. If you have a library card you can search Oplin Research Database. Go to the car repair reference center and enter your type of vehicle. There will be an option for repair information. Do a search.. Or you could just unplug anything necessary, vacuum lines, wiring. Loosen any nuts, bolts, fasteners, etc. holding the intake on. Replace any gaskets you disturb. Might be a good idea to check on a gasket kit in advance. Remember what you took off and put it back on in reverse. If it is broken replace it. Hope this helps..

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1 Answer

I have a 1992 Mercury Grand Marquis with the 4.6L V8 with roughly 50,000 to 60,000 miles on it and while the engine runes great when it is cold, when the engine warms up, it starts to rattle/knock during...

First, there are 8 bolts holding the metal Airhorn to the Intake manifold. Underneath this part is a gasket and under the gasket is a groove. The groove can Carbon up and affect the performance of your car. The gasket costs $10 and the job takes an hour or more.

If this does not help, you may need a knock sensor which is suppose to reduce the timing and keep the engine from knocking.

You can also get a free scan from Autozone or Oreillys and some other parts stores. This may tell you if other parts are needed. The gasket and groove I told you about will sometimes generate a Code 401. Just try cleaning the groove instead of buying an EGR or Solenoid.

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