Backfire through carb, timing?
Thread Starter
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
Backfire through carb, timing?
just got done racing the wife a little bit, she has a 2003 stock 350z, i beat her. any way, had some backfire through carb, i put in a new distributor last saturday and set the idle speed timing for 12. which direction should i experiment to eliminate the backfire. only on WOT did i have the issue. I got a 78 with a spartan 350 crate engine in it. edlebrock intake manifold, headers, rochester q-jet carb.
thanks
thanks
Last edited by Doug1; Sep 23, 2012 at 02:29 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,379
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
The timing would have to be off by over 20 degrees before you'd get a backfire up through the carb. My papers outline timing setting in detail - just e-mail me for the timing papers. Setting initial to 12 doesn't mean much, and is no indication of what your total is.
The two common issues that will cause backfire up through the carb are lean mixture and valve train issues.
Lars
V8FastCars@msn.com
The two common issues that will cause backfire up through the carb are lean mixture and valve train issues.
Lars
V8FastCars@msn.com
Thread Starter
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
The timing would have to be off by over 20 degrees before you'd get a backfire up through the carb. My papers outline timing setting in detail - just e-mail me for the timing papers. Setting initial to 12 doesn't mean much, and is no indication of what your total is.
The two common issues that will cause backfire up through the carb are lean mixture and valve train issues.
Lars
V8FastCars@msn.com
The two common issues that will cause backfire up through the carb are lean mixture and valve train issues.
Lars
V8FastCars@msn.com
Last edited by Doug1; Sep 23, 2012 at 03:06 PM.
Thread Starter
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
well i went ahead and fiddled with timing a tiny bit, set it closer to 14 and turned those two mixture screws out a half turn each. went for a spin, ran like a champ. thanks lars for responding and your advice.
