high idle need help please

10

Asked by Jun 16, 2016 at 11:29 PM about the 1991 Lincoln Mark VII LSC

Question type: Maintenance & Repair

my lincoln has developed a very high idle. starts fairly normal maybe a touch high on idle. as it warms up the idle just keeps climbing. settling at around 3000rpm. i replaced bad ground wire. replaced idle air control valve. replaced map sensor. still rpm is between 1800 rpm as it warms then climbs back to 3000 rpm. now if we disconnect the vacuum line to the map sensor and let it loudly leak air the idle drops to 800 rpm with a rough idle. any clues? i am stumped...

2 Answers

23,345

clean throttle plates, check for codes, iat sensor or maf sensor could be

10

throttle body has been cleaned thoroughly. iat is from my understanding idle air control valve and it has been replaced with new. my year does not have a mass air flow sensor but it does have a map sensor. it is also new but i am starting to think defective. or it is getting a incorrect signal? what controls the map sensor? if i unplug the vacuum to map sensor it does idle down. but if i unplug the wires while running it dies.

1 people found this helpful.

Your Answer:

Lincoln Mark VII Experts

  • #1
    oldschoolone
    Reputation
    200
  • #2
    Tom Demyan
    Reputation
    160
  • #3
    DSO84BlackBeauty1
    Reputation
    150
View All

Related Models For Sale

Used Ford Mustang
268 Great Deals out of 38,445 listings starting at $1,350
Used Lincoln Town Car
28 Great Deals out of 1,468 listings starting at $1,900
Used Ford Thunderbird
19 Great Deals out of 1,082 listings starting at $6,498
Used Ford F-150
2,426 Great Deals out of 208,189 listings starting at $1,300
Used Lincoln Continental
31 Great Deals out of 3,188 listings starting at $23,995
Used Dodge Dakota
80 Great Deals out of 3,086 listings starting at $1,495

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.