CSL Commissioning Gremlin..

Wes

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I'm at the pointy end on the car restoration now. Have taken it for a couple of short trips ahead of the 300km drive back to my new house.
Car is now running well but there's still one issue I can't seem to sort.

Once the car is warm on the road (say 15min into the drive) a buzzing or mosquito like noise starts in the cabin. The pitch of the noise also seems to vary. Put your head in the engine bay and it can't be heard. Turn the motor off it dies instantly.

I'm yet to really dig into it but seems to be from around the tunnel or behind the centre consul. My thinking is it's electrical and potentially something with a moving part that gets wonky once warm. My car is without a radio or speaker at present and has no AC. Could it be a dodgy relay that's partially shorting? My car just had its roadworthy and all the lights and switches worked fine and still do.
Some one must have had the same issue?
 
Does it have an electric fuel pump?
A relay that does not quite close and oscillates seems reasonable, maybe isolate by removing uses instead of shutting down the engine?
 
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Does it have an electric fuel pump?
A relay that does not quite close and oscillates seems reasonable, maybe isolate by removing uses instead of shutting down the engine?

Yes it does have an electric fuel pump.
Wondered if it could be a fuel pump. Will start diagnosing next weekend.
I'm hoping whatever it is it will let me drive car back home before I fix it..
 
Yes it does have an electric fuel pump.
Wondered if it could be a fuel pump. Will start diagnosing next weekend.
I'm hoping whatever it is it will let me drive car back home before I fix it..
On my E24 M30 SFDon showed me I had been driving with a dead in-tank pump for a year and it drove fine, so you can remove the pump fuse and check that item.

In other words one pump sucks and the other one pushes.
 
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