Vehicle & Technical > Discovery

v8 only firing on 7 not 8

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Range Rover Blues:
What I'd suggest is you soak the manifolds with water before you start it up and see which if any don't heat up.

BTW whilst it seems logical that a missfire on both gas and petrol can't be down to either fuel system, it could be down to a leaky injector.  Check the colour of you plugs.

Bulli:
Right, buy a set of spark indicators. they plug in between your ht lead and your plug. this will let you see straight away if you have a spark or not. Eliminating things is the key.
First sparks...if you are missing a spark on 1 cylinder only it can only be the plug , ht lead or the dizzy cap.
now check fuel. The easiest way is to remove the plugs and clean them then run it for a minute and take out the plugs. They should all look pretty similar . If one varies massively this is the problem cylinder.
Check the injector wiring for that cylinder, if that looks ok then check the compression on that cylinder.
Are you 100% sure it is only running on 7? V8's do have their little foibles and can sometimes change note or sound quite a bit. Im in Rotherham and could spare a hour or 2 if you fancy a run up.

Range Rover Blues:
TBH If i'm trying to detect a misfire by disconnecting the injector plugs I have to pull 2 or 3 before I can notice a drop in revs.  V8s are so powerful at idle.


BTW, I stuck Rovacom onto the LSe the other day and it reported a missfire on bank B.  Bludy hell even I hadn't noticed it.

gtomo2:
quick update on the misfiring. having got the exhurst silent now i can hear the engine and there is a knocking sound coming from the same cyl that was blowing badly. so me thinking maybe a broken or very out rocker arm. so will be taking the rocker cover off this week and seeing if its that. good job a have a spare head for it

Range Rover Blues:
Weak/broken valve spring
blocked hyrdraulic lifter of faulty the same
worn camshaft
piston slap

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