# 98 mercury grand marquis speedometer works intermittently **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 21, 2014, 8:46pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558 "2014-06-21T20:46:38Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![grizz](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/grizz/32/2597_2.png) [@grizz](https://community.cartalk.com/u/grizz)\ **Post date:** [June 21, 2014, 8:46pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/1 "2014-06-21T20:46:38Z")
what could be ready to go south and what kind of money? thanks for any info. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 21, 2014, 9:49pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/2 "2014-06-21T21:49:09Z")
No Check Engine light? Tester ---
**Author:** ![grizz](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/grizz/32/2597_2.png) [@grizz](https://community.cartalk.com/u/grizz)\ **Post date:** [June 21, 2014, 9:52pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/3 "2014-06-21T21:52:38Z")
no light. ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [June 21, 2014, 9:56pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/4 "2014-06-21T21:56:13Z")
Could be corrosion on the electrical contacts on the back of the dash cluster. I had a similar problem with my 2000 Explorer’s tachometer. It would quit working, but hit the dash on top and it would work again. I needed to replace the backlight bulbs, so I cleaned all the connectors for the speedo, tach, and other gauges while I had it out. It’s behaved ever since. ---
**Author:** ![grizz](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/grizz/32/2597_2.png) [@grizz](https://community.cartalk.com/u/grizz)\ **Post date:** [June 21, 2014, 10:17pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/5 "2014-06-21T22:17:12Z")
how long would cleaning these connectors take a garage to do, usually? ---
**Author:** ![knfenimore](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@knfenimore](https://community.cartalk.com/u/knfenimore)\ **Post date:** [June 21, 2014, 10:19pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/6 "2014-06-21T22:19:37Z")
I would clean the dash connectors as @busstedKnucles suggests and also the connector for the Vehicle Speed sensor. ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [June 21, 2014, 10:40pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/7 "2014-06-21T22:40:37Z")
@grizz, ask for a quote. I don’t know how much needs to be disassembled to remove your dash cluster. It was a 2hr job on my explorer, but I needed to remove much of the lower dash. ---
**Author:** ![grizz](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/grizz/32/2597_2.png) [@grizz](https://community.cartalk.com/u/grizz)\ **Post date:** [June 22, 2014, 9:50pm UTC](https://community.cartalk.com/t/98-mercury-grand-marquis-speedometer-works-intermittently/85558/8 "2014-06-22T21:50:47Z")
tester made me think, would this type of problem cause a check engine light to come on?