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Old 19th July 2019, 19:51   #1
Raspberrycai
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Rover 75 Saloon, Merc 190E 1.8, '91 Yamaha SR125

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Default Speedometer not working

Hi,

Speedometer has been working intermittently in the last week. It's done it before, but today I drove ~100 miles and the speedometer stopped working for about 75 of those miles.

Fuel gauge also likes to stick, but sometimes when the speedometer stops working it'll go up and down a quarter of a tank and just start wobbling. When the speedo stops working the mileage doesn't go up.

I'm thinking it may be the battery, because today the car would crank once, cut out, then come on again and start up but the letter "E" would appear next to the P on the information screen. Apparently I can check the voltage through the diagnostics menu so I'll do that tomorrow.

I've got no other warning lights such as the traction control or ABS light (could it still be the ABS sensor, which apparently causes these issues) so what could the problem be? I'm doing my oil change tomorrow so I'd best try and sort it whilst I'm doing that I reckon.


Cheers.
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2004 Rover 75 Saloon - Connoisseur S.E - 2.0 Diesel CDTi - Platinum Gold - Auto.

1991 Mercedes 190E 1.8 (Nico) / 1991 Yamaha SR125 (David)
This vehicle (Nigel) was born Wednesday, 15th September 2004 @ 08:14:39 and was the 103,810th 75 to run off the production line, out of 112,381 - This vehicle was the 3,096th 75 CDT Connoisseur SE (135) to be made out of 4,744 - This vehicle was the 303rd 75 in Platinum Gold (code: MCN) to be made out of 1,685 Platinum Gold 75s
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Old 19th July 2019, 19:53   #2
marinabrian
 
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Check your plenum now !!
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Old 19th July 2019, 19:57   #3
Raspberrycai
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Quote:
Originally Posted by marinabrian View Post
Check your plenum now !!

That's what I'll do first thing tomorrow!

We've had heavy rain recently so you're probably spot on.
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2004 Rover 75 Saloon - Connoisseur S.E - 2.0 Diesel CDTi - Platinum Gold - Auto.

1991 Mercedes 190E 1.8 (Nico) / 1991 Yamaha SR125 (David)
This vehicle (Nigel) was born Wednesday, 15th September 2004 @ 08:14:39 and was the 103,810th 75 to run off the production line, out of 112,381 - This vehicle was the 3,096th 75 CDT Connoisseur SE (135) to be made out of 4,744 - This vehicle was the 303rd 75 in Platinum Gold (code: MCN) to be made out of 1,685 Platinum Gold 75s
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Old 19th July 2019, 20:36   #4
Raspberrycai
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Default

Just gave the plenum a check and it's dry as a bone in there really. There's quite a lot of mouldy leaves which were damp and could hold moisture right by the ECU, so that could have caused the problem, but there was no water in there.

Hopefully this has solved the issue, but any more clues on what it could be if not that?
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2004 Rover 75 Saloon - Connoisseur S.E - 2.0 Diesel CDTi - Platinum Gold - Auto.

1991 Mercedes 190E 1.8 (Nico) / 1991 Yamaha SR125 (David)
This vehicle (Nigel) was born Wednesday, 15th September 2004 @ 08:14:39 and was the 103,810th 75 to run off the production line, out of 112,381 - This vehicle was the 3,096th 75 CDT Connoisseur SE (135) to be made out of 4,744 - This vehicle was the 303rd 75 in Platinum Gold (code: MCN) to be made out of 1,685 Platinum Gold 75s

Last edited by Raspberrycai; 20th July 2019 at 09:07..
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Old 20th July 2019, 09:47   #5
bendrick
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Quote:
Originally Posted by Raspberrycai View Post
Just gave the plenum a check and it's dry as a bone in there really. There's quite a lot of mouldy leaves which were damp and could hold moisture right by the ECU, so that could have caused the problem, but there was no water in there.

Hopefully this has solved the issue, but any more clues on what it could be if not that?
Only issue that I've had similar to this was getting back in my car the other week down the supermarket and all the dials were dead.

Got home and after advice on here did the old battery disconnect for 20 minutes coneccted back up and they all came back on and have been fine ever since.
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Old 20th July 2019, 10:49   #6
Mike Noc
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Quote:
Originally Posted by Raspberrycai View Post
Just gave the plenum a check and it's dry as a bone in there really. There's quite a lot of mouldy leaves which were damp and could hold moisture right by the ECU, so that could have caused the problem, but there was no water in there.

Hopefully this has solved the issue, but any more clues on what it could be if not that?

If the plenum drains are partially blocked then water levels can get high when it rains and then subside over time.


The E on the dashboard may be the clue to what happened - ECM got wet and then lost communication with the automatic gearbox.


If it happens again best get it checked out - Brian does a very fast and very thorough turn around by post for the ECM if it is faulty.
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