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

6,215

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

Add photo

Related Questions

Search Lincoln Mark VII Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Lincoln Mark VII Experts

#1 oldschoolone
oldschoolone
Reputation 180
#2 Tom Demyan
Tom Demyan
Reputation 160
#3 DSO84BlackBeauty1
DSO84BlackBeauty1
Reputation 140
View All

Related Models For Sale

Used Lincoln Continental
3,749 listings starting at $42,995
Used Lincoln Town Car
34 Great Deals out of 2,102 listings starting at $1,995
Used Ford Mustang
534 Great Deals out of 42,737 listings starting at $1,699
Used Ford F-150
3,017 Great Deals out of 207,758 listings starting at $1,000
Used Buick Riviera
130 listings starting at $2,495
Used Ford Thunderbird
23 Great Deals out of 1,099 listings starting at $6,995
Used GMC Yukon
556 Great Deals out of 17,134 listings starting at $1,875
Used Cadillac Eldorado
383 listings starting at $2,400