Why is my car idling high

Asked by Derrick Oct 10, 2023 at 05:41 PM about the 1997 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

I have code p1506 it's idling high at 1050 rpms, I have
cleaned maf sensor, replaced tps sensor,egr valve,iac
valve, cleaned throttle body, nothing is helping it runs
fine its just getting horrible gas milage like 10 mpg
city I also replaced fuel pump and filter I checked for
vacumn leaks and there was none, I also unplugged
egr while running and there was no difference in idle
and help would be appreciated

2 Answers
311,455

Gene answered about a year ago

Leaking fuel injectors, leaking fuel pressure regulator(very common), internal engine vacuum leak, misadjusted minimum air rate, basic engine problem worn rings, compression low, timing chain slop, tune up.

Mark helpful
311,455

Gene answered about a year ago

Forgot to mention: Beware aftermarket sensors and controls motors. Only use Factory replacement if possible.

Mark helpful

Your Answer:

Related Questions

  • Why is my car idling high 2 Answers

    I have code p1506 it's idling high at 1050 rpms, I have cleaned maf sensor, replaced tps sensor,egr valve,iac valve, cleaned throttle body, nothing is helping it runs fine its just getting horrible...

    1997 Mercury Grand Marquis 4 Dr LS Sedan

    -

    Maintenance & Repair

  • Blower motor runs on high while the car is running. 1 Answer

    While the car is running, the blower motor runs on high. The high/low control nob does not change the speed of blower. It will not turn off. It will fluctuate between vents when pressing the off bu...

    2003 Mercury Grand Marquis LSE

    -

    Maintenance & Repair

  • Why my car making a loud noise under my car? 2 Answers

    When I put my car in any gear it start making a loud clucking noise my passenger right tire leaning in some car won’t move could it possibly be bad ujoints on the drive shaft or the differential??

    2004 Mercury Grand Marquis LS Ultimate

    -

    Maintenance & Repair

  • Why do I have to start my car in neutral 1 Answer

    Why do I have to start my Marcey grand mar in neutral and why does it not want to get up an go

    1996 Mercury Grand Marquis 4 Dr LS Sedan

    -

    Maintenance & Repair

  • Why does my car keep shutting down every so often? 1 Answer

    While I'm driving my car shuts down as if I don't have power to engine every so often. The only code that a shop can read o's a cylender head temp sensor but they state that's not why it's shuttin...

    2000 Mercury Grand Marquis GS

    -

    Maintenance & Repair

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 225 nationwide Grand Marquis listings starting at $1,800.

ZIP:

Own this car?

Share your experience with others.

1997 Mercury Grand Marquis

Write a car review

Review another car

Shortcuts

Search Mercury Grand Marquis Questions

CarGurus Experts

  • #1
    Tracy Hooks
    Reputation
    9,930
  • #2
    Trippmeister
    Reputation
    5,180
  • #3
    Bob Beaman
    Reputation
    3,900
View All

Know more, shop wisely

Search

Related Models For Sale

Used Lincoln Town Car
10 Great Deals out of 348 listings starting at $1,990
Used Ford Crown Victoria
101 listings starting at $6,995
Used Ford F-150
6,633 Great Deals out of 167,687 listings starting at $1,500
Used Chevrolet Impala
203 Great Deals out of 3,524 listings starting at $1,900
Used Honda Accord
1,392 Great Deals out of 26,098 listings starting at $1,900
Used Chevrolet Caprice
3 Great Deals out of 62 listings starting at $4,749
Used Toyota Camry
2,266 Great Deals out of 42,097 listings starting at $800
Used Buick LeSabre
151 listings starting at $2,999
Used Ford Mustang
1,001 Great Deals out of 22,326 listings starting at $2,500
Used Lexus LS
111 Great Deals out of 1,491 listings starting at $3,100
Used Toyota Avalon
156 Great Deals out of 1,996 listings starting at $2,499
Used Cadillac DeVille
208 listings starting at $4,988

Used Cars for Sale

2011 Mercury Grand Marquis For Sale
9 listings
2010 Mercury Grand Marquis For Sale
25 listings starting at $5,900
2009 Mercury Grand Marquis For Sale
13 listings
2008 Mercury Grand Marquis For Sale
20 listings starting at $3,899
2007 Mercury Grand Marquis For Sale
4 Great Deals out of 19 listings starting at $3,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.