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Scott W.
Scott W., Mercury Technician
Category: Mercury
Satisfied Customers: 3321
Experience:  26 yrs. experience with Ford, Lincoln and Mercury.
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My 2002 mercury grandmarquis with 200,000 miles hesitates on

Customer Question

my 2002 mercury grandmarquis with 200,000 miles
hesitates on acceleration and is getting worse...
replaced fuel pump
cleaned MFI
replaced 8 coil packs
plus all spark plugs.
fuel line pressure tested very low hence we replaced the fuel pump
any suggestions
Submitted: 1 year ago.
Category: Mercury
Expert:  Scott W. replied 1 year ago.

Hello my name is ***** ***** the engine feel like it is misfiring, or does it have very low power with no misfire?

Expert:  Scott W. replied 1 year ago.

I suspect you either have low fuel pressure, or a MAF sensor that is bad giving the wrong air measurement into the engine. It is also possible the exhaust could be plugged too. These are the most common concerns we see with this vehicle. Let me know what the fuel pressure is under load when the vehicle is not running correctly. Thanks Scott