backfire?
Le Mans Master
Joined: Apr 2000
Posts: 5,089
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From: New York New York
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2023 C1 of the Year Finalist - Unmodified
Does it pop out the exhaust, after fire, or up through the carburetor, back fire?
Does it 'pop' when you are accelerating or only when you let off the throttle and are decelerating?
If only on decelerating then I would suspect an air leak in the exhaust.
Does it 'pop' when you are accelerating or only when you let off the throttle and are decelerating?
If only on decelerating then I would suspect an air leak in the exhaust.
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Le Mans Master
Joined: Sep 2004
Posts: 5,116
Likes: 5
From: Livonia MI
As mentioned, gotta be some kind of timing/ignition problem. Good idea pulling a few things apart, as the nylon quiet cam gear, is known to be a problem over time. If this is warn to the point, the chain starts jumping teeth, could be some walking in your near future.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Here's some good info on how timing works:
http://forums.corvetteforum.com/c3-t...long-post.html
Keep the shiny side up!
Scott
http://forums.corvetteforum.com/c3-t...long-post.html
Keep the shiny side up!
Scott
Tech Contributor
Joined: Aug 1999
Posts: 14,373
Likes: 6,370
From: At my Bar drinking and wrenching in Lafayette Colorado
You set up your timing and vacuum advance as outlined in my papers. E-mail me if you need copies of the timing paper and vacuum advance paper - specific instructions for altering the length of the timing curves are in the papers.
Popping in the exhaust is primarily the sign of a lean condition - you're going to want to richen it up in addition to fixing the timing.
Lars
V8FastCars@msn.com
Popping in the exhaust is primarily the sign of a lean condition - you're going to want to richen it up in addition to fixing the timing.
Lars
V8FastCars@msn.com
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
Small update (spent my weekend under a buddies 69 Mustang).
My vac canister says "B9", which (if I'm not mistaken) is a VC1605.
I made only one change this weekend, turned on Decel Fuel Cut. Backfire is much less violent and happens less often as well.
Next step, recheck my timing.
My vac canister says "B9", which (if I'm not mistaken) is a VC1605.
I made only one change this weekend, turned on Decel Fuel Cut. Backfire is much less violent and happens less often as well.
Next step, recheck my timing.