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Topic: Rev counter not working ? (Read 539 times) |
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Scorpio123
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Rev counter not working ?
« on: Aug 8th, 2007, 1:19pm » |
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Hi all, My red cosworth that ive recently accquired has a couple of problems.
1> The rev counter doesnt work at all, it wont budge from the bottom
2> The speedo does the same , but not all the time, sometimes its ok then all of a sudden it drops to the bottom & stays there, and it may or may not return straight away.
3> There is a noise coming from the rear when driving, its like a humming drone that gets louder the faster you go, is it a wheel bearing ? Or something worse.
Thanks Simon
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pete from Hull
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Non Scorpio at the moment, but still interested...
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Re: Rev counter not working ?
« Reply #1 on: Aug 8th, 2007, 2:21pm » |
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Hi Simon,
IMO the problem with the speedo and rev counter could be a wiring issue, somewhere on the site I have seen reference to a repair that can be carried out on the instrument cluster, (dry Joints) etc but I'm blowed if I can find it, someone may reveal it's whereabouts soon though.
Check the VSS and the CPS as well. http://www.fordscorpio.co.uk/intbasicelec/vss.pdf
The noise at the back sounds like a wheel bearing, see this page for replacement details, htp://www.fordscorpio.co.uk/rhubs.html
I did mine twice on my last car 'cos I got bearings from a third party supplier and they were faulty so I would recomend getting genuine ford parts.
hth
Pete
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Jonnycab
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Former owner of 2.3 Ultima Facelift saloon
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Re: Rev counter not working ?
« Reply #2 on: Aug 8th, 2007, 2:50pm » |
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Regarding the noise at the back, it could also be the diff. When they're worn they tend to make a humming drone that gets louder the faster you go 
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Scorpio123
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Re: Rev counter not working ?
« Reply #3 on: Aug 8th, 2007, 2:59pm » |
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Hi Pete, thanks for the info/linksI will look into & try it out
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Scorpio123
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Re: Rev counter not working ?
« Reply #4 on: Aug 8th, 2007, 3:00pm » |
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Hi Jonnycab, How can I tell if its the diff or not ? Is there anything I should look for ?
Thanks
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Jonnycab
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Former owner of 2.3 Ultima Facelift saloon
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Re: Rev counter not working ?
« Reply #5 on: Aug 8th, 2007, 3:53pm » |
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The only way I can suggest is to try & work out where the drone is coming from.
If it's in the middle of the car, then likely it's the diff. If it's more to the left or right, then likely a bearing. But in my experience wheel bearings tend to squeak & squeal more than drone when they're on their way out.
You could also check to see if the diff is leaking any oil, or if it's low on oil then give it a top up. It may quieten it down
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Rev counter not working ?
« Reply #6 on: Aug 8th, 2007, 4:05pm » |
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I'd take a look at the cv joints and the prop centre bearing 
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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Sewingkit
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2.9 Cosworth Auto 1995, I love my car more than...
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Re: Rev counter not working ?
« Reply #7 on: Aug 8th, 2007, 6:10pm » |
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Hi
I just had the same thing with my speedo, twas the VSS!
£70 from ford mind you but at least it will last (longer than the car I would think!)
Steve
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mr._floppy
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Re: Rev counter not working ?
« Reply #8 on: Aug 8th, 2007, 6:12pm » |
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If the sound is the same whether on overrun ( when you take your foot off the gas pedal ) or booting it, then I'd discount the diff.
They tend to be very robust on the Scorp, diff problems are few and far between on this board, they go on forever .
My Crown Vic Forum reccommends changing the Diff oil every 30k miles !!! 
aye, that will be right , a money making exercise for FMD's more like.
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Scorpio123
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Re: Rev counter not working ?
« Reply #9 on: Aug 8th, 2007, 7:08pm » |
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Thanks all for your input, im going to see if I can solve the problems with what youve told me.
Thanks Simon
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Scorpio123
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Re: Rev counter not working ?
« Reply #10 on: Aug 8th, 2007, 7:50pm » |
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Forgot to ask, would the VSS also be responsible for the rev counter or just the speedo ?
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Rev counter not working ?
« Reply #11 on: Aug 8th, 2007, 8:19pm » |
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just the speedo
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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Scorpio123
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Re: Rev counter not working ?
« Reply #12 on: Aug 8th, 2007, 9:22pm » |
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Ok thanks, will have to remove instrument panel & see if that sheds anymore light on as to why the rev counter isnt working.
Cheers
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pete from Hull
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Re: Rev counter not working ?
« Reply #13 on: Aug 8th, 2007, 10:25pm » |
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I believe the rev counter is fed from the Crank Position Sensor via the ECU....
Could be a wiggle the wire type of job, especially after all the rain we've had
hth
Pete
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Scorpio123
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Re: Rev counter not working ?
« Reply #14 on: Aug 8th, 2007, 10:43pm » |
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Thanks pete, come tomorrow will give it a try.
If alls good will let you know.
Thanks Simon
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Simmo
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Re: Rev counter not working ?
« Reply #15 on: Aug 9th, 2007, 7:14am » |
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I think THIS is what Pete was trying to find. It relates to another issue but may help IF you take the cluster out. Personally I'd try the 'wiring wiggle' route first. 
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Scorpio123
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Re: Rev counter not working ?
« Reply #16 on: Aug 9th, 2007, 9:52am » |
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Thanks Simmo, will go for the easier wiggle option first, but if no joy then will try the more complicated option.
Thanks
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