Misfiring Range Rover

Hi, I have a 2003 (52) L322 Range Rover which is misfiring. At 1st I didn't notice it until my mechanic told me my ECU was registering a slight misfire on cylinder number 5. Sometimes I could feel a slight vibration when driving. Anyway to cut a long story short, this developed into a serious misfire with the orange warning light flashing very soon after I had an alternator and battery replacement. The car would judder and vibrate heavily on gentle driving at 30mph. This would be intermittent misfiring and would often correct itself when I switched the engine off then on. This happened initially in the snow, now the weather is warm and the misfire doesn't rectify when I switch the engine off then on although the misfire is still intermittent until yesterday when it has now become constant. This misfire had behaved quite oddly, after a heavy intermittent misfire, upon leaving the car for a few days it behaved normally, during driving, I could make it misfire by putting ok cruise control at 30mph and then it behaved ok when I switched off cruise control. Anyway the car has had a new coil (swapped to cylinder 6 and still missing), a new injector, compression tested, leak tested, inlet manifold tested, ECU remapped. Now am really stuck and so is my mechanic. Other things that may be of relevance - it has had a couple of hoses blow (steam and coolant loss) on the cooling system, a new thermostat and (don't ask me how) an accidental short accross both battery terminals after the alt was replaced but before the battery. Any help would be greatly appreciated. Thanks for reading.

Sorry I forgot to add that she's had 8 new spark plugs fitted, the engine has been de-sludged and the oil and filters changed and injector cleaner also put into the petrol tank. Many thanks once again, Simon

Hi
Now 5 years later, did you ever sort that problem? I think we have the same issue with our 2003 L322 - worsening missing with missing on cylinder three fault message. In our case the engine runs well when cold but once up to temp the missing begins. It is worse under acceleration especially from lower revs but also intermittently at steady speeds. Changing plugs and coil & cleaning the injectors haven't helped.
Any ideas?

PhilHamilton said:

Hi
Now 5 years later, did you ever sort that problem? I think we have the same issue with our 2003 L322 - worsening missing with missing on cylinder three fault message. In our case the engine runs well when cold but once up to temp the missing begins. It is worse under acceleration especially from lower revs but also intermittently at steady speeds. Changing plugs and coil & cleaning the injectors haven't helped.
Any ideas?

Click to expand...

he has never been back to say if he cured it,so you had better go to the Range Rover section and ask in there about your own problem,good luck.

PhilHamilton said:

Hi
Now 5 years later, did you ever sort that problem? I think we have the same issue with our 2003 L322 - worsening missing with missing on cylinder three fault message. In our case the engine runs well when cold but once up to temp the missing begins. It is worse under acceleration especially from lower revs but also intermittently at steady speeds. Changing plugs and coil & cleaning the injectors haven't helped.
Any ideas?

Click to expand...

Get a compression test done, may be HGF

Datatek said:

Get a compression test done, may be HGF

Click to expand...

Or worn out cam shaft my dads ex police RRC did this ok newer car but same parts

cornish rattler said:

Or worn out cam shaft my dads ex police RRC did this ok newer car but same parts

Click to expand...

Cams are not a failure item on the BMW V8, unlike the Rover V8 they are made out of steel instead of cheese