Question about 1994 Mercury Grand Marquis

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94 grand marquis driving at highway speed or up incline engine has intermittent power loss til i pull over then it runs fine. changed fuel filter and gas cap. engine codes are 172 and 176

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  • lryguz Jul 16, 2009

    I still use the same gas and have not added any additives. I did find today that if I push the accelerator down almost to the floor the engine seems to die and run rough. If I leave off the pedal it will clear up. I also have trouble when trying to start out slow with the pedal. I have to fluter the pedal once to get the car going.
    Thanks
    Lryguz

  • lryguz Jul 20, 2009

    We're on the right track,the TPS did help some but still have sputter if I mash the throttle. If I slowly accelerate it seems to run smooth. I still have to check it on the highway. Will post after more testing.

  • Mike Butler
    Mike Butler May 11, 2010

    Have you added any additives or changed gas stations lately? Which engine do you have?

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  • Mercury Master
  • 5,522 Answers

Your codes indicate both sides of your engine are running lean. You may have success with a throttle position sensor. The TPS tells the engine how much fuel is wanted and to advance spark. It is behind the plastic ductwork, on the metal body called an airhorn. Usually on the drivers side. It has 2 screws and 1 electric plug and rides the butterfly flap outside the airhorn. Used to be $25.

I see you have codes and I can not tell you why it did not pull up the TPS. The alternative is to have someone check your fuel pump pressure.

Posted on Jul 20, 2009

  • fordexpert Jul 26, 2009

    You can try something I did on my 1994 Crown Vic(165000miles). Okay, the airhorn comes off with 8 bolts. You need a $10 gasket and a screwdriver and gumout. When you have the airhorn off you will see a gasket, remove it, and there will be a groove. Scrape the carbon out, spray it, and clean the straight notch to the EGR chamber. Reinstall everything and it should make a big difference in performance.

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