1969 miss- help!!
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Joined: Nov 2006
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From: New York
1969 miss- help!!
I have a 69 vette with a 350. When it runs it has a feeling of a miss. They motor vibrates and the acceleration is not too good. It happens throughout the entire RPM range. It happens cold and hot. I have changed everything: plugs, wires, distributer cap, rotor, points, coil, set the dwell, set the timing, cleaned out the carburator, and still it does not run correctly. It starts OK and idles but there is that annoying feeling its not on all cylinders. It does not smoke or burn oil. It runs at a normal temperature. Any ideas would be appreciated, I've almost given up! Thanks!!
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
I have a 69 vette with a 350. When it runs it has a feeling of a miss. They motor vibrates and the acceleration is not too good. It happens throughout the entire RPM range. It happens cold and hot. I have changed everything: plugs, wires, distributer cap, rotor, points, coil, set the dwell, set the timing, cleaned out the carburator, and still it does not run correctly. It starts OK and idles but there is that annoying feeling its not on all cylinders. It does not smoke or burn oil. It runs at a normal temperature. Any ideas would be appreciated, I've almost given up! Thanks!!
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Joined: Nov 2006
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From: New York
Thread Starter
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Joined: Nov 2006
Posts: 51
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From: New York
Race Director
Joined: Sep 2004
Posts: 11,874
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
look for things that are out of balance.....start with the fan clutch....is it wobbling? are all the belts running straight?
and be sure to check the firing order....these cars run amazing well even if two wires are crossed
and be sure to check the firing order....these cars run amazing well even if two wires are crossed
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Melting Slicks
Joined: Feb 2002
Posts: 2,625
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From: Cut n Shoot TX
This happened to me a long time ago. With me a push rod had wore a hole thru one of the rockers, making that cylander useless. The symptom was the same as yours.
missing all thru the rpm range, but at idle it was not real noticeable.
missing all thru the rpm range, but at idle it was not real noticeable.
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
You are correct, they typically don't once they are set up. I am suggesting that they may not have been adjusted correctly. What you describe sounds like you may have one adjusted too tight. You should go through them all using the [running] procedure that is being discussed currently in the Tech section.