Poppimg/missing/backfire
Thread Starter
Instructor
Joined: Jul 2015
Posts: 129
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From: pa
Poppimg/missing/backfire
!970 454 runs good when initially running...after it warms up, it runs like its missing it backfires and breaks up under acceleration. I thought it could be carburation, any ideas??
thanks
steve
thanks
steve
Melting Slicks
Joined: Feb 2006
Posts: 3,105
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From: Sunrise FL
What is the history of the car...this a new problem? Could be bad fuel, debris in carb, etc.
I would pull the plugs and look at them. Looking for mis fire on some cylinders, and overall color and condition.
I would pull the plugs and look at them. Looking for mis fire on some cylinders, and overall color and condition.
Thread Starter
Instructor
Joined: Jul 2015
Posts: 129
Likes: 0
From: pa
can initial timing be performed w/o finding tdc on cylinder 1?? I basically am working on this by myself and I feel the timing is all jacked up.....there is no vacuum line run from the hei to the carb so most likely that is part of the problem....I was just gonna hook up time light and adj timing to 0 degrees....would that be right??
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Joined: Jan 2016
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From: Reno Nevada
can initial timing be performed w/o finding tdc on cylinder 1?? I basically am working on this by myself and I feel the timing is all jacked up.....there is no vacuum line run from the hei to the carb so most likely that is part of the problem....I was just gonna hook up time light and adj timing to 0 degrees....would that be right??
Setting it to 0 degrees would not be correct.
Not sure of the exact number off the top of my head, but something on the order of 34 degrees total timing is in the ball park. That is after distributor advance takes place. I am sure someone here has the exact tolerances or you can google them as well.
0 degrees would be way too retarded to operate correctly in almost any circumstance.
All of this is assuming you are running a standard distributor with a carb setup. If you have a computer setup, then follow those directions as they are likely different.
Last edited by 73racevette; Jun 8, 2016 at 04:12 PM.