Quote:
Originally Posted by glatt
There are so many vacuum hoses! I was looking for possible disconnected hoses and kept finding new ones to inspect.
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Better designed cars have a number on each hose. A vacuum hose diagram confirms each connection. I once found two hoses reversed. Car still started.
EGR valve will not open fully with 'mouth vacuum'. But just enough to confirm its works. More important is no leak (ie stray piece of carbon) from exhaust to intake manifold.