X5 4.6is Engine noise/idle compared to 4.4i

[allisong]

I have just changed my X5 from a 4.4i to and 4.6is (low mileage late car) and I notice more valve noise from the engine at ilde (more mechanical noise) and the right side exhaust sounds erratic compared to the left side. sounds a little like it misses a beat, idle is smooth however.

Just need to know if this is normal (my 4.4i was so smooth and quiet) or if not what could be the issue?

Any help appreciated, Geoff

[4.6is Ryder]

Doesn't sound normal. I went from a 4.4i to a 4.6is and that was not the case. The exhaust should have a lil more growl, but that's about it...........Phil

[vinuneuro]

Originally Posted by allisong

I have just changed my X5 from a 4.4i to and 4.6is (low mileage late car) and I notice more valve noise from the engine at ilde (more mechanical noise) and the right side exhaust sounds erratic compared to the left side. sounds a little like it misses a beat, idle is smooth however.

Just need to know if this is normal (my 4.4i was so smooth and quiet) or if not what could be the issue?

Any help appreciated, Geoff

check ignition related stuff (coils,plugs,wires)

[cimbro]

please, I'm very interested to know the difference of performance between the two model.

Thank you!