Help! Marquis Jerking/Heating and then runs fine until it happens again

45

Asked by Apr 07, 2011 at 09:08 AM about the 2000 Mercury Grand Marquis

Question type: Maintenance & Repair

Driving down normally and suddenly the car jerks and looks like shuts down and 2 seconds later is back running normal.
its scary if it happens on the highway!
When this happens, Check Engine, TEMP light and LOW FUEL lights are on!
At this point the car is overheating and I also notice small variations in oil pressure.
So, I stop to cool down and then 5 minutes later back on the road and working fine.
Sometimes I keep driving or cruising in neutral and the car cools down and I continue driving until it happens again...it heats up and then cools down.

The problem used to start only if the car was floored but now Its getting worst and happens anytime.

Took it to a mechanic and he flushed the coolant + changed the temp valve. Took the car for a test and floored it and it worked fine! no hesitation..nada! :D

2 days later, I have the same problem except its WORST! :(

Please help.


1 Answer

2,875

I would look at the catalytyic converter. It sounds like it has clogged up. Award points if this helps

Your Answer

Add photo

Related Questions

Search Mercury Grand Marquis Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,040
#2 kbro
kbro
Reputation 2,030
#3 Js08016
Js08016
Reputation 1,580
View All

Related Models For Sale

Used Lincoln Town Car
39 Great Deals out of 2,127 listings starting at $1,995
Used Ford Crown Victoria
5 Great Deals out of 1,395 listings starting at $1,700
Used Chevrolet Impala
933 Great Deals out of 35,377 listings starting at $1,700
Used Ford F-150
3,070 Great Deals out of 208,275 listings starting at $1,200
Used Cadillac DeVille
5 Great Deals out of 1,964 listings starting at $1,600
Used Chevrolet Tahoe
884 Great Deals out of 28,086 listings starting at $1,700
Used Buick LeSabre
11 Great Deals out of 2,266 listings starting at $1,299
Used Honda Accord
983 Great Deals out of 75,076 listings starting at $899
Used Toyota Camry
1,205 Great Deals out of 96,020 listings starting at $1,250
Used Chevrolet Camaro
443 Great Deals out of 40,684 listings starting at $3,500

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
43 listings starting at $7,500
2010 Mercury Grand Marquis For Sale
6 Great Deals out of 130 listings starting at $2,999
2009 Mercury Grand Marquis For Sale
4 Great Deals out of 107 listings starting at $2,995
2008 Mercury Grand Marquis For Sale
4 Great Deals out of 153 listings starting at $2,995
2007 Mercury Grand Marquis For Sale
9 Great Deals out of 162 listings starting at $1,985