280i idle speed too high

[440Interceptor]

Morning all, I've done maybe 50 kms since getting the 280i back on the road and all is going well.

One thing I need to address is that the car idles at around 1400-1600rpm when warm. I haven't touched the idle speed screw yet as I'm just letting the car get settled again after so long off the road, but this seems to be consistent each time I drive it.

Any obvious things to check?

[440Interceptor]

Zig, I haven't tried from the throttle body and can't until tonight, but using the pedal it goes straight back to 1500rpm, no dip then climbing revs.

[440Interceptor]

I was thinking idle speed screw on throttle body inlet rather than mixture. Only issue is that at startup from cold it idles fine at 900rpm, so if I reduce idle speed it may struggle from cold. Anyway, I'll have a gander tonight.

[440Interceptor]

turned down the revs at the throttle body, and all now seems fine. Been out 3-4 times and idle is now 1000 and steady.

[440Interceptor]

You don't know the half of it Zig! I have found that I have a very special car. The more I drive - I have done 100kms this weekend - the HIGHER my fuel gauge reads! Yes, I have a TVR the creates petrol!

Well, either that or I have made a bit of a blue with the sender unit...

Seriously though, I noticed this the other day and assumed without much thought that I had the sender unit contacts the wrong way around. Duly swapped them over and.. no difference. The needle is still resolutely heading for the full mark as I drive!

I can't see how I could have gotten the sender unit itself upside down when i put it back into the newly painted tank but in the absence of any other explanation ...maybe I have. I really don't fancy pulling it all apart at the moment so I'm going to see if it can be trusted the way it is, and tackle it some other time. 2 steps fwd and 1 step back!