I've noticed a bad knocking coming from the vacuum pump recently (diagnosed using the long screwdriver in the ear technique :wink: ). I've removed the pump to see if anything obvious is broken but all looked good. Once refitted the noise went away, but after 2 mins came back.
The car has the electronic turbo solenoid so the vacuum pump only provides vacuum for the brake servo and exhaust flap. Whist pulling the pipe off that feeds the exhaust flap (there is a split in the engine bay next to the NSF strut tower) there is slight vacuum but not enough to operate the flap. Increasing the revs doesn't increase the vacuum either.
Has anybody else experienced this or can confirm how much vacuum they're getting?
Whilst doing some research it appears that BMW recalled all 2013 and earlier N20 cars in the US for a bad oil supply to the vacuum pump (that ultimately could cause brake failure), and a re-profiled end to the intake camshaft was installed on later models allowing better oil flow to the pump. Doing the checks mine has the older camshaft :x
Regards
The car has the electronic turbo solenoid so the vacuum pump only provides vacuum for the brake servo and exhaust flap. Whist pulling the pipe off that feeds the exhaust flap (there is a split in the engine bay next to the NSF strut tower) there is slight vacuum but not enough to operate the flap. Increasing the revs doesn't increase the vacuum either.
Has anybody else experienced this or can confirm how much vacuum they're getting?
Whilst doing some research it appears that BMW recalled all 2013 and earlier N20 cars in the US for a bad oil supply to the vacuum pump (that ultimately could cause brake failure), and a re-profiled end to the intake camshaft was installed on later models allowing better oil flow to the pump. Doing the checks mine has the older camshaft :x
Regards