Misfire on M62 4.4l V8 (Range Rover)

[gavsadler]

Hello all,

So about 2 weeks ago, my brother-in-law purchased a 2003 Range Rover, fitted with the BMW 4.4l V8.

The car had a light misfire at large throttle openings (normal driving it is fine). He serviced it yesterday, apparently the oil looked toxic, and the spark plugs were completely shot.

His local spares shop has now supplied him with Bosch Super4 plugs (the ones with the 4 electrode tips). He's fitted those, but says the misfire is now much worse - still at large throttle openings.


Some questions:

1) Obviously, any ideas what the problem could be (coil packs maybe)?

2) I suggested to maybe try swap out the plugs, with NGKs or something. Does anyone know a plug code off hand which he can source?

Thanks

 

[Fordkoppie]

Even a bullet proof BMW V8 cannot survive the bad reliability vibes of a LR:roflol:
:sorry:

 

[Blue Shirt]

The correct spark plugs for the M62B44 are:
BOSCH FGR7DQP
NGK BKR6EQUP

If the misfire continues after installing the correct plugs, check for air leaks in the intake or swap the coil packs around to see if the misfire follows the coil pack. You can really only determine this with diagnostic tools.

Since you mention that the misfire is only evident at large throttle openings (i.e. high fuel flow rate), it can also be caused by a partially blocked injector. Again, having diagnostics will assist greatly in identifying the problem.

 

[Fordkoppie]

Could also be a fuel pump or FPR

 

[gavsadler]

Update, so he took it to have diagnostics done yesterday afternoon. Coil packs 1&7 were poked.

Replaced those, and also swapped out for NGK plugs as mentioned above. He says the car is running like a dream now.

Thanks for the input. I suspect this thread will continue as the issues make themselves known. Not to worry, he received plenty of jabs about buying a Land Rover / Range Rover. :rollsmile:

 

[jcwdrop]

These can be good value for money. What is his mileage?

 

[Peter@AEW]

These can be good value for money. What is his mileage?

...for the mechanic that services them

 

[gavsadler]

These can be good value for money. What is his mileage?

Mileage is just over 130000kms on this vehicle.

 

[Maljan]

Check out Doug DeMuro's videos on his 2006 Range Rover ownership experience. It is the stuff of internet lat egend. Basically, he bought a $3900 warranty with the car and has racked up more than double that in repairs!

[video=youtube]

 

[aksamg]

Even a bullet proof BMW V8 cannot survive the bad reliability vibes of a LR:roflol:
:sorry:

True story! Had my fair share of bad experiences! :thumbdo:

 

[jcwdrop]

Even a bullet proof BMW V8 cannot survive the bad reliability vibes of a LR:roflol:
:sorry:

True story! Had my fair share of bad experiences! :thumbdo:

If you don't do all which needs to be done on these motors they can be pretty unreliable even in BMW guise. 1st thing to do at that mileage is test the timing chain then make sure to refresh the cooling system.