Question about 1999 Mercury Grand Marquis

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Why won't it go more than 45 miles per hour? - 1999 Mercury Grand Marquis

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Have the catylitc converters checked if they are plugging up that can cause it

Posted on Apr 20, 2015

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My 2002 Hyundai accent won't go past 40 miles per


Get the codes pulled, sounds like you are in limp mode and I am guessing an issue with the transmission.

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Van does fine until you reach about 45 miles per hour and you get a jerking hesitation until you reach about 50 miles per hour and it stops. doesn't do it any other time.


You may want to do a basic tune up. Plugs, wires, cap&rotor, PCV, and don't forget the fuel filter. It is a forgoten, yet sometimes vital, part of a tune up. If you have already done this within a reasonable mileage, hit me up and we'll try to figure this thing out.

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Reads 40 TO 45 miles per hour but I know I am going faster and sometimes it will drop to 0 miles per hour.


A place in Flint Michigan will repair this problem (speedo motor) for 100.00 and will replace all the other motors associated with your dash instruments. Off of Hill Road Near I-75. Did my truck in 20 minutes. Works Great!!! Business called Speedometer Something.

Jan 15, 2010 | 2003 GMC Sierra

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Accelerate on gas pedal and does not go past 45 miles per hour


suspect cruse control setting.
some cruse control settings can be made so that no matter how hard you press the pedal it will only go to the set speed. check manual for any secondary cruise control setting that might have been set to 45.

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Speedometer sticks / jumps


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Vehicle hakes when driving 45 to 50 miles per hour


Check wheel balance,
check steering linkages for loosness - such as tie rod ends, steering rack linkages etc,
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Jul 07, 2009 | 1996 Jeep Grand Cherokee

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I have a 91 F-350 That bogs down at 45 mile per hour and real bad if your pulling a trailer


the culprit could be your fuel filter or the vacuum advance on your distributor.i recomend to replace filter and also do a manuel check of vacuum advance on distributor.

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Viabration from tires when driving 45 to 50 miles per hour


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