Disconnected vacuum advance on dist.
07-12-2010, 06:30 PM
#1
Burning Brakes
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Member Since: Jul 2006
Location: Sebastian Florida
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Disconnected vacuum advance on dist.
My vette has been surging at idle in drive. about 200rpms fluctuation.
When I disconnected the vac advance it idles fine.
What is probably wrong? and do I need to reconnect or can I leave it disconnected?
The cars seems to be running fine without it.
When I disconnected the vac advance it idles fine.
What is probably wrong? and do I need to reconnect or can I leave it disconnected?
The cars seems to be running fine without it.
07-12-2010, 09:50 PM
#2
Drifting
Sounds like your engine's manifold vacuum is too low for the vacuum advance unit. It should be all in by 2" hg less than your vacuum reading at idle. I would not run a street car without vacuum advance, because you are limiting the power band by throwing away low-load torque.
07-12-2010, 10:04 PM
#3
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Member Since: Apr 2010
Location: Vancouver British Columbia
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Been there done that
There are lots of threads here about setting the correct timing, but the Surging turned out to be a faulty Vac Advance can for me.
Good Luck !
