I have just bought a 1994 Range Rover Classic 3.9 Efi that has been standing
for a number of years. After a full service the engine now runs really well,
most of the time.
When the engine is started it runs really fast.
As soon as there’s a load on the engine it settles down, idling in traffic is
also fine, any ideas what’s going on?
Mike Hutchinson, Slough, Berkshire
This is likely to be the stepper motor, or idle air control valve, that is
mounted at the back of the plenum chamber on the right-hand side of the engine.
The part number is ETC6660 and you should expect to pay around £40 for a
pattern part, and up to £150 for an original equipment equivalent .
You can take the valve out and clean it but this rarely works. It is very
common for these to stick when an engine has not been run for a long period. In some instances it can stick all the time, so that you have a tickover of
The good news is that this isn’t a difficult job – this part takes less than a
minute to fit.
This workshop advice appeared in the Spring 2014 issue of LRO. Back issues are available to download on digital devices here.