tach on my 91 Mark VII is sporadic, malfunctioning

Asked by May 14, 2012 at 07:00 AM about the 1991 Lincoln Mark VII LSC

Question type: Maintenance & Repair

the tach on my 91 markVII is acting up it reads right for about 5 seconds the jumps to around 4 grand for another 5 seconds then goes back to the right reading and continues this cycle the whole time its running, just wondering if there is a ballast or relay for the tach that may have went bad or is it just the cmplete tach unit itself any input would b appreciated  thanx

1 Answer

6,985

Ah! I know just the problem you're talking about. My Mark did that also. It is caused by a bad ground on one of the wires to your tach. The wire is orange and can be located right behind the kick-panel near your fuse box. There are two bundles of wire -- it is the orange wire in the smaller bundle. Also, your fuel gauge will no longer read full all the time.

Your Answer

Lincoln Mark VII Experts

  • #1
    oldschoolone
    Reputation
    190
  • #2
    Tom Demyan
    Reputation
    160
  • #3
    DSO84BlackBeauty1
    Reputation
    150
View All

Related Models For Sale

Used Lincoln Continental
19 Great Deals out of 3,408 listings starting at $32,794
Used Lincoln Town Car
31 Great Deals out of 1,726 listings starting at $500
Used Ford Mustang
610 Great Deals out of 39,251 listings starting at $1,895
Used Ford Thunderbird
22 Great Deals out of 1,060 listings starting at $6,800
Used Chevrolet Camaro
460 Great Deals out of 31,468 listings starting at $1,450
Used Chevrolet Blazer
3 Great Deals out of 944 listings starting at $950
Used Chevrolet Caprice
149 listings starting at $9,995
Used Pontiac Grand Prix
16 Great Deals out of 2,675 listings starting at $1,750

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.