Quote:
Originally Posted by mr_robot
As far as I know the N62 in the 4.8is doesn't have a secondary air pump. Just the vacuum pump on the right side of the timing cover.
Or am I not following you?
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Correct, the X5 N62 doesn't have those emission air pumps. They're on 5 and 7 series N62 engines, the air pipes and pumps located under the intake manifold.
I would have thought the issue you're facing is the known intermediate levers problem that requires replacement with updated version? I'm just glad I verified mine are the updated version while doing the valve stem seals.
The other thing to note...was this issue there BEFORE the valve stem seals were replaced? I ask because during valve stem seals replacement, if the rocker arms are mixed up while installing them back (they have different tolerances for each valve stem), or if the spring keepers are installed up-side down, you could have intermittent misfires - exactly what you're describing. I did the valve stem seals myself and I rechecked and rechecked and rechecked yet again that I didn't make those mistakes. Just a thought....