I pressurewashed the engine to my 2000 grand marquis and now it is running rough and idleing rough as well what do I do now

Asked by Jan 27, 2017 at 06:49 PM about the Mercury Grand Marquis

Question type: Maintenance & Repair

5 Answers

96,485

Remove the engine coils one at a time and dry out the spark plug wells. While you are at it install new plugs and seal the coil boots with dielectric grease. NEVER wash a Triton engine or you will have this problem.

116,705

You could have gotten water under the plug wires, in the coil pack, short the oxygen sensors, do you have a leaf blower, start that up and blow the hell out of it. Look uder the fuse and relay box. Let it dry a few day with the hood up.....

1 of 1 people found this helpful.
116,705

OH YEAH DON'T WASH YOUR ENGINE EVER AGAIN !!!!

1 of 1 people found this helpful.
96,485

There are 8 coils and the spark plug wells are designed to collect water. I know because I used to wash my truck engine - no more.

1 of 1 people found this helpful.
116,705

You said it F O R

1 of 1 people found this helpful.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,499 nationwide Grand Marquis listings starting at $999.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,910
  • #2
    kbro
    Reputation
    2,210
  • #3
    Js08016
    Reputation
    1,980
View All

Related Models For Sale

Used Lincoln Town Car
26 Great Deals out of 1,567 listings starting at $1,200
Used Ford Crown Victoria
4 Great Deals out of 834 listings starting at $2,000
Used Chevrolet Impala
483 Great Deals out of 31,772 listings starting at $1,000
Used Ford F-150
2,998 Great Deals out of 231,248 listings starting at $1,300
Used Dodge Charger
318 Great Deals out of 36,009 listings starting at $1,999
Used Cadillac DTS
33 Great Deals out of 1,622 listings starting at $2,980
Used Chrysler 300
340 Great Deals out of 19,603 listings starting at $1,400
Used Mercury Marauder
27 listings
Used Chevrolet Tahoe
801 Great Deals out of 40,246 listings starting at $1,799
Used Ford Mustang
342 Great Deals out of 41,799 listings starting at $1,488
Used Chevrolet Caprice
141 listings starting at $6,995
Used Honda Accord
790 Great Deals out of 89,573 listings starting at $1,444
Used Ford Taurus
185 Great Deals out of 16,123 listings starting at $1,900
Used Chevrolet Silverado 1500
2,664 Great Deals out of 158,108 listings starting at $1,850
Used Dodge Challenger
168 Great Deals out of 26,023 listings starting at $7,250

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.