Vehicle & Technical > Range Rover
Missing a beat
Garth:
Dyslexia rule KO :oops: :oops: :oops:
Range Rover Blues:
Ok, silly things time, did you check the routing of your new plug leads as per the diagram in the manual, it shouldn't be a problem with good leads but tracking between leads can cause problems on a V8.
When did you last change the oil and did you use good stuff, there was a post recently by Eyore to the effect that cheap oils froth inside the hydraulic lifters and cause an intermittant misfire. On that theme so can a badly worn cam.
Inlet manifold leak
Badly worn dizzy
faulty coil
leaky injector
So what colour were the plugs that came out?
MuddyMike:
How many miles has the engine done on the current cam shaft?
Mike
Garth:
Plug leads routed as per manual
Oil :- Millers Magnol and new
Plugs :- light brown
Sprayed WD 40 around all inlets - plenim etc. OK
Dont know how many miles engine has done (its a different one to original)
MuddyMike:
If a Rover V8 has had regular changes with decent quality oil the camshaft will last up to 100,000 but no more. If however the oil has not been changed regularly or poor quality oil has been used it wont make 50,000 without serious wear. The lobes simply wear away with those on the rearmost cams going first. Have a good look inside the rocker covers removing one if necessary. Is there a lot of black tar like deposit? If so this is a sure sign of poor oil change routine and a good guide to the cam being worn. The hydraulic lifters both mask the effects and contribute to the early wear by keeping in constant contact with the cam. Replacement of the cam shaft and lifters is not a massive job, nor are the parts that expensive. Its a good idea to replace the timing chain and sprockets and fit an oil pump overhaul kit whilst you are in there. Take a look at http://www.v8engines.com/engine-4.htm#worncams it gives useful information on cam wear and lot more.
Mike
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