Doug_Dwyer
May 6, 2023, 1:53pm
3
It’s been a long time since I dealt with this so my memory is fuzzy. But this thread has some good discussion that might help. it has remarks from Dick Maury…who is always worth listening to, IMO.
I might study it myself, to refresh my memory !
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The effect of disconnecting a vacuum connection depends on the size of the hose - the engine uses vast amounts of air even in idle, and a bit extra, air, a vacuum leak, makes little difference…
Idle will increase with hose size, some 30 - 50 rpms for a ‘normal’ vacuum hose - a large leak may interfere noticeably with fuelling as the leak bypasses the AFM. However, engine behaviour to an air leak may also depend on hose interconnections - and where the hose is disconnected, or the leak occur…
Cheers