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Topic: Is this a VSS problem? (Read 514 times) |
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burmesepython
Newbie
1996 Cossie Estate & 1995 12v Ultima Estate
Posts: 19
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Is this a VSS problem?
« on: Apr 7th, 2005, 9:00pm » |
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Hi,
The car is 95 2.9 12v ultima, the problems - many.
When it is cold - no problem.
But as soon as it warms up - idle gets erratic. As it gets hotter, speedo starts understating speed (changed instrument cluster - the same), gearbox won't change into top until 3500 revs (speedo says 40mph - real speed more like 70mph), stereo volume erratic, heater starts going cold then hot.
I'm leaning towards VSS, but would that account for all this?
Cheers,
Adam..
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Couple of Scorps, couple of snakes, couple of kids
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burmesepython
Newbie
1996 Cossie Estate & 1995 12v Ultima Estate
Posts: 19
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Re: Is this a VSS problem?
« Reply #2 on: Apr 7th, 2005, 9:27pm » |
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thx for the tip - will try that out tomorrow
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Couple of Scorps, couple of snakes, couple of kids
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burmesepython
Newbie
1996 Cossie Estate & 1995 12v Ultima Estate
Posts: 19
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Re: Is this a VSS problem?
« Reply #3 on: Apr 7th, 2005, 9:52pm » |
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Just did a quick round the block test.
At 25mph on speedo - digital readout says 40 and at speedo 40mph, digital says 60 mph.
Is the changeup on the box triggered by the speedo - not the vss? That is the only way I can think to explain why it does not go into top until speedo say over 40mph - but at this point vss would inducate over 60
Cheers,
Adam..
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Snoopy
Administrator
Very old.BAD tempered and missing friends.
Posts: 6278
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Re: Is this a VSS problem?
« Reply #4 on: Apr 7th, 2005, 10:34pm » |
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Ther is one other thing to check before going down the route of the VSS .. Under the Idle controlvalve there is a vacum conncetion which does get knoocked off sometimesand if its disconected the ger changes on the 12 v become very erratic and the idle is awful. Otherwise clean the icv and then change the vss if all else fails.
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Eric_R
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Cosworth Owner 1998 - 2006 & site co-founder
Posts: 1792
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Re: Is this a VSS problem?
« Reply #5 on: Apr 8th, 2005, 8:20pm » |
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Adam,
Yes, the VSS signal is used by the Powertrain Control Module (EECIV on yours) to change into 3rd and Top - and it is used by the radio when the Automatic Volume Control is selected, and also by the steering rack where you have a speed-sensitive steering option.
From your description the VSS is certainly suspect - the manual is at http://www.fordscorpio.co.uk/manual/electrical/intbasic/VSS.pdf
Changing it is quite a simple job.
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