Speedo calibration unit

[Andav469]

I'm getting a high idle when coming to a stop (2000rpm then settles after 10 secs) I suspect it's a faulty speedo calibration unit on a BTR diff, anyone got one that is surplus to requirements?

[Andav469]

1200 isn't good but 2000 is a real PITA, especially on the appoach to a roundabout or junction, there is no engine braking and wants to accelerate and not slow down!

[Andav469]

jojackson4 said:

Have you done the clean and set on the pick up?

Yes, though it made no difference.

My understanding is that the speedo will fail or read sporadically if the pick up is set wrong

[Andav469]

ianwayne said:

Does it do it when the engine has warmed up? Mine sometimes does this when cold but stops when the engine is warm so I eliminated that as a cause.

It does it all the time, ok when started, only does it when the car has been moving

[Andav469]

The problem was the fuel temp and coolant temp senders were crossed.

The big mystery is, the same high idle issue was there before I changed my engine and first happened in November after the car had been laid up for four weeks and the wiring had not been touched at that point!