I have a long-running VANOS problem that has me stumped. I will, somewhat randomly, see various faults relating to the intake cam timing. By far the most common one is P0011. But, when I monitor real-time data, all looks fine - the "Reference" position is always at 119.x degrees, and the actual position is always within ~1 degree of the target position, all the way up to 5000 RPM.
I originally suspected there was something wrong with the way I timed it when I rebuilt the head last year, but if that was the case, it seems to me it would ALWAYS be throwing one or more faults. But, it will go sometimes a week or two with NO faults, then, typically, seems to throw a fault on a warm engine start.
I was just about to pull the valve cover and double-check the timing, but that now seems to me like a waste of time. Any ideas what I should do? Seems to me this may be some transient that occurs on engine start, which suggests perhaps it's related to oil pressure?
Regards,
Ray L.
I originally suspected there was something wrong with the way I timed it when I rebuilt the head last year, but if that was the case, it seems to me it would ALWAYS be throwing one or more faults. But, it will go sometimes a week or two with NO faults, then, typically, seems to throw a fault on a warm engine start.
I was just about to pull the valve cover and double-check the timing, but that now seems to me like a waste of time. Any ideas what I should do? Seems to me this may be some transient that occurs on engine start, which suggests perhaps it's related to oil pressure?
Regards,
Ray L.