Car won't go past 30 mph. It seems as though it won't catch the next gear. When I get up to 30 it just revz as though it is in neutral but when it goes back down to 25 or so I can go up to 30-35 again

Asked by Oct 10, 2015 at 02:56 PM about the 1987 Mercury Grand Marquis

Question type: Maintenance & Repair

I did an transmission oil/ filter change
hoping that was the problem but it still
continues to do this.

4 Answers

It may a clogged catalytic converter. If so, it will not allow the engine exhaust to process through.


I had a very similar problem with my 1987 Mercury Grand Marquis. Driveability in lower gears (below city speed limit) was normal. However, speeding up e.g. on the highway was not possible any more. I needed a general overhaul of my automatic transmission. Most of the coupling elements inside the transmission housing were worn out and burned. If you have the same problem, a filter change and oil renewal won' t help at all.


Car won't go over 30 mpr want to do

1 of 1 people found this helpful.

Push fuel filter reset button in the trunk brought $ 500 worth of parts and that's all it was

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,216 nationwide Grand Marquis listings starting at $1,400.


Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
  • #2
  • #3
View All

Related Models For Sale

Used Lincoln Town Car
21 Great Deals out of 1,430 listings starting at $1,800
Used Ford Crown Victoria
5 Great Deals out of 919 listings starting at $1,700
Used Dodge Charger
270 Great Deals out of 33,011 listings starting at $495
Used Ford F-150
2,558 Great Deals out of 220,223 listings starting at $1,222
Used Ford Mustang
291 Great Deals out of 38,369 listings starting at $1,995
Used Honda Accord
540 Great Deals out of 94,361 listings starting at $1,300
Used Cadillac DeVille
1,261 listings starting at $2,699
Used Ford Taurus
143 Great Deals out of 15,698 listings starting at $1,900

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
18 listings starting at $6,995
2010 Mercury Grand Marquis For Sale
68 listings starting at $2,900
2009 Mercury Grand Marquis For Sale
6 Great Deals out of 78 listings starting at $3,400
2008 Mercury Grand Marquis For Sale
4 Great Deals out of 99 listings starting at $2,999
2007 Mercury Grand Marquis For Sale
3 Great Deals out of 95 listings starting at $1,400

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.