Question about 2001 Mercury Grand Marquis

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2001 Mercury Grand Marquis hesitation and jolting from 35-45 mph

The car almost sputters from 35-45 mph. Have changed the fuel pump. No luck. Any ideas?

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  • stroteam1 May 19, 2009

    Car was brought to a mechanic for this problem and he replaced the fuel pump. Would the need for a tune-up, spark plugs, wires, etc cause a problem only in the 35-45 mph range?

  • stroteam1 May 19, 2009

    Thanks. I'll try it.

  • Teddi B May 11, 2010

    In need of ignition tune-up. Spark plugs, wires, etc. Problem with fuel injection system, clogged fuel filter. Intake air leak, EGR system malfunctioning.

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Sure, the more the throttle and the longer its open the more gas is being injected so if the spark is not there it will spotter. I think you have nothing to loose with an ignition tune-up. It'll be more economical than taking it to a mechanic and still ending up with the same problem. You should change the fuel filter also it could be clogged and there is'nt enough fuel delivered at these speeds. You can also try a fuel injector cleaning solution the kind you pour in the gas tank. This might work for you.

Posted on May 19, 2009

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