Bad valve seals?
Thread Starter
Racer
Joined: Aug 2011
Posts: 429
Likes: 24
From: Charlotte NC
Bad valve seals?
The vacuum gage has a flutter to it and does not read steady. Seems to be using oil especially at high speed. Some plugs are fouled some are not. Maybe valve guides?
Last edited by CiCiC3; Apr 27, 2016 at 04:28 PM.
Instructor
Joined: Apr 2016
Posts: 104
Likes: 7
From: Denver Colorado
How much of a flutter? If some of the spark plugs are getting oil fouled you almost certainly have piston ring or cylinder scoring issues.
Thread Starter
Racer
Joined: Aug 2011
Posts: 429
Likes: 24
From: Charlotte NC
Thread Starter
Racer
Joined: Aug 2011
Posts: 429
Likes: 24
From: Charlotte NC
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Drifting
Joined: Dec 2004
Posts: 1,714
Likes: 42
From: Austin Texas
Cici,
I just performed this test on my car because I had the same vacuum gauge flutter at idle.
Connected to brake booster hose to intake manifold = Flutter
Connected to manifold vaccum port on carburetor = Smooth
For me, this was a good discovery.
John
I just performed this test on my car because I had the same vacuum gauge flutter at idle.
Connected to brake booster hose to intake manifold = Flutter
Connected to manifold vaccum port on carburetor = Smooth
For me, this was a good discovery.
John
Thread Starter
Racer
Joined: Aug 2011
Posts: 429
Likes: 24
From: Charlotte NC
I plugged into the carburetor base from the vacuum line that goes to the distributor. That should be a good reading there. It flutters about the width of the needle. Some dirty plugs probably but I'm still checking into the cause for that.