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        General >> Problems >> Erratic speedometer
        
(Message started by: martink on Apr 27^th, 2006, 6:57pm)

Title: Erratic speedometer
Post by martink on Apr 27^th, 2006, 6:57pm

Hi

My speedo intermittently dies. Usually after about 15- 20 minutes running. The sender is OK (new & tested). When it goes the gearbox loses overdrive & torque lock and all related dash functions stop...speedo. miles, trip miles, fuel computer (says 0mpg). Not pleasant at speed on the motorway as the gear change is hard and sudden!

Any ideas what's wrong? the garage can't find it.

Cheers

Martin

Title: Re: Erratic speedometer
Post by Octavian_P on Apr 27^th, 2006, 7:07pm

It could be the engine loom, or water in the fuse boxes. Do you have a battery cover fitted ?

Title: Re: Erratic speedometer
Post by Snoopy on Apr 27^th, 2006, 7:15pm

If its NOT the VSS then it has to be the loom but the faults you indicate, point to a faulty VSS.

Title: Re: Erratic speedometer
Post by martink on Apr 27^th, 2006, 7:21pm

HI

Sorry to be uninformed, what's a VSS?

The fusebox cover is in place, has been since I had to rebuild the fusebox innards after a flood! Godd jigsaw therapy!

I forget to add, it's an early (N) 2.9 12V Estate

Is the bit of loom readily identified?

Thanks Martin

Title: Re: Erratic speedometer
Post by Kjetil S on Apr 27^th, 2006, 7:23pm

VSS = Vehicle Speed Sensor (Your "sender")

Title: Re: Erratic speedometer
Post by Snoopy on Apr 27^th, 2006, 7:32pm

I have just noticed that you are refering to the 12v Scorpio, In that case also check the small black vacum pipe that runs from under the IACV on the air intake . Make sure its connected and has no leaks it can be knocked off quite easily and will lead to loss of gears and lock up .The older 12v use vacum to control the lock up