My 1990 Range Rover Classic 3.9 automatic sometimes has an extremely low idle when it’s hot, and tends to stall. After that happens, it takes a very long time until it revs up again and runs normally. The ignition leads and plugs are new and I also tried a different ignition coil but it had no effect. What might be the problem?
Second, there seems to be a problem with the ZF automatic transmission. When I start the engine and select ‘D’ it takes about half a minute until the gear is selected.
Werner Gabelar Graz, Austria
There could be many things causing the first fault. Test to see if there’s a good spark at the spark plugs when you’re struggling to restart the engine: there are inline testers available for only a few pounds from various auto electrical suppliers. If the spark is good, check the inlet system for air leaks and check the stepper motor is working.
The gearbox fault is potentially more serious. The first thing I would do is change the gearbox oil and filter. If this doesn’t cure the fault, the gearbox will have problems in the valve block and you’ll need a reconditioned gearbox.
This workshop advice appeared in the January 2009 issue of LRO. Back issues are available to download on digital devices here.