Quote:
Originally Posted by Clan
Don't overlook the vacuum pump . If it is pumping hard trying to build up a vacuum it ejects the air it collects into the back of the pump and out into the camshaft area so will cause a chuff chuff noise !
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Yeah, I did consider the vac pump, it still makes the noise even with the main vac hose (from the nipple on the pump) plugged tight, even went as far as changing the pump out, just to rule it out.