backfire problem?

kidneyboy · 07-14-2005, 11:35 PM

Out for a little spin by the lake tonight when I hit the gas at a green light the car backfired and then almost stalled.

So at the next red I tried it again, stomped the gas and same result.

If I get on it once I'm moving no problem. Ideas?

Thanks.
Mike

tlaselva · 07-15-2005, 01:54 AM

First thing I would check is your wires, make sure their tight.

Then your plugs.

Sounds like one of your cylinder's isn't getting a spark.....

Good luck.

4GTABODT · 07-15-2005, 12:50 PM

Mike, 9 times out of 10, its usually something electrical as mentioned above, wires, plugs, timing so that would be my first things on the checklist. But sometimes too, a loss of vaccum can cause a backfire as well so check all your vaccum lines while you're at it. Finally check all the carb settings and fittings. Good luck

7t2vette · 07-15-2005, 01:03 PM

Hey Mike, a lean condition can also cause a backfire in the carb, have you made any mods recently?

kidneyboy · 07-15-2005, 01:30 PM

Thanks for all the good advice guys, I'm going out after lunch to have a look. I'll let you know what I find out. No Bruce no new mods. By the way I saw all your for sale stuff I amy be out in Pickering this weekend if you're home can I stop by and have a look?
Mike

7t2vette · 07-15-2005, 03:44 PM

No problem Mike

Maymyvetteliveforevr · 07-15-2005, 04:49 PM

Is it backfiring through the carb or the exhaust?

Frank

kidneyboy · 07-15-2005, 05:22 PM

carb

4GTABODT · 07-15-2005, 05:45 PM

Mike, when it comes to backfiring through the carb, 99.9% of times it comes down to 1 of 2 things...incorrect timing or carb setting (usually too rich)...try to wiggle your distributor cap and see if there is any play in it...if its tight and no has messed with the timing then set your attention to the fuel mixture. If the cap is loose, then you'll need to retime it with a timing light. Not sure about your exactly but SB chevy's usually come out of the factory with timing set between 6 and 8 degrees. If you need a timing light, I'm in Oakville and can give you a hand on the weekend...

Maymyvetteliveforevr · 07-15-2005, 06:12 PM

I'll tend to go with what 4GTABODT, says and lets hope that's the problem. I had the same problem when my wife had a Z28 with a 350 and the same symptoms, except it was a gradual backfire which slowly intensified. It ended up being the 2 lobs on the cam were wearing out. I don't believe and am hoping that's not your case.

Keep us updated.

Frank

kidneyboy · 07-15-2005, 08:34 PM

I'll keep you posted. Was working from home today with the hopes I could get out and work on the car a bit. Too busy. First thing tomorrow. Thanks for the help.

Mike

Maymyvetteliveforevr · 07-21-2005, 09:45 PM

How are you making out kidneyboy?

Keep us posted.

Frank

AGVI · 07-21-2005, 09:57 PM

patience grasshopper...Lars will fix all.

kidneyboy · 07-22-2005, 01:28 AM

just getting home from a three day road trip, haven't even started her yet.

Won't get the chance now until after work tomorrow. Anyway can't wait for Lars to fix it! See you all on Sunday!
Mike

Maymyvetteliveforevr · 07-22-2005, 12:16 PM

Thanks for the update kidneyboy, I hope that it's not a serious problem. By the way, when is the dates that Lars is coming to town.

I wish I could pick his brain on my vacuum problem.

Frank