This LRO reader emailed LRO.firstname.lastname@example.org to ask Andrew Varall about causes for erratic revs with a Range Rover Classic.
I went to see a 1993 Range Rover Classic Vogue 3.9 EFi that I’m thinking of buying. When it fired up, the revs shot up to about 4000rpm then dropped and almost stalled, then shot up again and then dropped almost to zero. It did that the whole five minutes it was running. The owner said it hadn’t been started for some months; it hadn’t done that before. Also, the oil and alternator warning lights came on even though the key wasn’t in the ignition. What do you think is wrong? Am I looking at a wildly expensive fix?
John Mason, Scourie, Sutherland
The running fault is likely to be either an air leak on the inlet side, the stepper motor (part no ETC6660, £40 approx) or the airflow meter (ERR5198, £95 approx). Check for air leaks first by checking all vacuum hoses are connected properly and that the inlet manifold and plenum chamber are tight, then check the stepper motor. If they’re not at fault, replace the airflow meter.
The dash lights coming on without the key in could be the ignition switch at fault, or it could be a wiring fault. All in all, I would be a bit suspicious of buying this vehicle because it seems that it has had some major work carried out with various mistakes and this could well mean that other repairs or upgrades haven’t been been done well either.
This workshop advice appeared in the Feb 2015 issue of LRO. Back issues are available to download on digital devices here.