Question about 1996 Mercury Grand Marquis
I have a 96 Grand Marquis with a similar problem. Also on the highway it would just conk out on me suddenly, almost felt like I was hitting the brakes, then it would pick up again. Eventually got to the point where it was stalling out on the highway and at red lights. One day it wouldn't start. Mechanic said the fuel filter was clogged solid. It has run well but every once in awhile still stalls out on me. From talking with other Grand Marquis owners and the mechanic the Mass Air Flow sensor may be to blame. He wanted to charge me $400 but I found the part online for about $85.
Posted on Apr 19, 2011
Check that the fuel pressure is within spec.
also the EGR port on the 4.6 litre can get full of carbon or the EGR valve does not close fully and simulates a vacuum leak.it can cause rough idle ,poor acceleration .it usually sets off the check engine light ..the lower intake can leak coolant into the combustion chamber and cause issues.
Posted on Mar 15, 2015
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Posted on Jan 02, 2017
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