Speedo see sawing!
Speedo see sawing!
Author
Discussion

Iaing01

Original Poster:

421 posts

240 months

Wednesday 16th July 2008
quotequote all
Just got the car back after its been sitting in a garage for 9 weeks! Drove it home last night and to work today. Everything was fine up until I was out this lunchtime when the speedo shot up and down erratically a few times up to the drving speed I was at then it settled down and started working as normal.

I've done a search and found the common speedo sensor / speedo problems although I'm unsure which of these it could be. Could it be that because the car has been sitting that its a bit damp and simply needs to be driven (yes i'm in denial smile)?

Anyway how can I tell if its the sensor or the speedo? I've checked the plugs in the passenger footwell and they seem to be dry.

If it is the speedo are they costly to replace?

Any help would be appreciated

Iain

JAZ 34

568 posts

272 months

Wednesday 16th July 2008
quotequote all
I had the same,

Sounds like the Sensor. Not expensive IIRC. Westhill SS fixed it for me.

You may find the next stage is total loss in the speedo and mileage readout.

Iaing01

Original Poster:

421 posts

240 months

Wednesday 16th July 2008
quotequote all
Is the sensor on the front drivers side wheel on the M400 and is it a Noble part?

Cheers

Iain


JAZ 34

568 posts

272 months

Wednesday 16th July 2008
quotequote all
I got it from Noble. Part No; EMP 36/2 £42.07 + VAT

http://www.pistonheads.com/gassing/topic.asp?h=0&a...



Edited by JAZ 34 on Wednesday 16th July 17:10

mgbond

6,749 posts

261 months

Wednesday 16th July 2008
quotequote all
JAZ 34 said:
I got it from Noble. Part No; EMP 36/2 £42.07 + VAT

www.pistonheads.com/gassing/topic.asp?h=0&t=375566&r=5178132&hm=30271#5178132



Edited by JAZ 34 on Wednesday 16th July 17:10


JAZ, did you put it on the nobleparts forum?

Bondy

JAZ 34

568 posts

272 months

Wednesday 16th July 2008
quotequote all
Hi Bondy,

Yes - done it.

Jamie

Naso Grande

237 posts

228 months

Wednesday 16th July 2008
quotequote all
Guys,
Is it the same system on all the models or just the 3R/M400?

Cheers,
Graeme

ThatPhilBrettGuy

11,810 posts

269 months

Wednesday 16th July 2008
quotequote all
Naso Grande said:
Guys,
Is it the same system on all the models or just the 3R/M400?

Cheers,
Graeme
I know some of the 2.5L with 5 speeds take a feed off the gearbox.

Ash 996 GT2

3,836 posts

270 months

Wednesday 16th July 2008
quotequote all
Iaing01 said:
Just got the car back after its been sitting in a garage for 9 weeks! Drove it home last night and to work today. Everything was fine up until I was out this lunchtime when the speedo shot up and down erratically a few times up to the drving speed I was at then it settled down and started working as normal.

I've done a search and found the common speedo sensor / speedo problems although I'm unsure which of these it could be. Could it be that because the car has been sitting that its a bit damp and simply needs to be driven (yes i'm in denial smile)?

Anyway how can I tell if its the sensor or the speedo? I've checked the plugs in the passenger footwell and they seem to be dry.

If it is the speedo are they costly to replace?

Any help would be appreciated

Iain
Trace the wire back through the fron bulkhead, cut out the connector and hard wire in.

If you look at the connector you will se it is corroded.

I had three new sensors before we realised there was nothing wrong with it.

Look back over some of my old posts, full story somwhere.

NobleGuy

7,133 posts

244 months

Thursday 17th July 2008
quotequote all
ThatPhilBrettGuy said:
Naso Grande said:
Guys,
Is it the same system on all the models or just the 3R/M400?

Cheers,
Graeme
I know some of the 2.5L with 5 speeds take a feed off the gearbox.
Yup. My '03 GTO3 does as well.