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weber carb back fires when I turn off the car.

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weber carb back fires when I turn off the car. #1
constamark Mark Constable Amherst, NH, USA Sign in to contact 1972 MG Midget MkIII "Elizabeth"	Topic Creator (OP) Sep 17, 2014 08:46 PM Joined 9 years ago 5 Posts

Any ideas as to what might be causing the back fire. I have rebuilt the carb and checked for leaks. Could the timing be set too high? Or is the carb to rich or lean?

Thanks in advance for the suggestions.

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Re: weber carb back fires when I turn off the car. #2
PeterC Peter Caldwell Madison Wisconsin, USA Sign in to contact 1931 Morris Minor Saloon "Cammy OHC" 1960 Land Rover Series II 1962 MG Midget MkI 1963 Volkswagen Karmann Ghia & more	Sep 18, 2014 12:11 PM Top Contributor Joined 18 years ago 6,506 Posts

Well..... after 15 hours, no one has stepped up to help you with an answer.

So, I will.

The answer to all of your questions is yes

World Wide Auto Parts of Madison www.worldwideimportautoparts.com

Supplying New Old Stock parts for all imports. A LARGE quantity being loaded to our EBAY store stores.ebay.com/worldwideimportautoparts Rebuilding lever shock absorbers for British cars. (608) 223-9400 M-F 9-5 Central or parts@nosimport.com

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Re: weber carb back fires when I turn off the car. #3
TeamEvil Thomas C (Disabled) Kingston, MA, USA Sign in to contact	Sep 18, 2014 01:02 PM Top Contributor Joined 12 years ago 5,815 Posts

Backfiring (coughing/spitting) through the car is a lean fuel mixture condition.

Backfiring through the exhaust is usually an indication of the carb being set too rich.

Other things like valve adjustments and timing, spark plug heat range, exhaust and intake gasket/fitting leaks and such can play into it as well.

You really ought to go over all of your engine settings one by one and get them correct as soon as you can.

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Re: weber carb back fires when I turn off the car. #4
dlrhine Dave Rhine Columbia, SC, USA Sign in to contact 1978 MG Midget	Sep 18, 2014 04:00 PM Joined 14 years ago 4,598 Posts

Mark

Does it backfire only when you turn the ignition off?

Also, does the engine run on after you turn the ignition off or just shut down immediately & backfire?

What Weber carb do you have?

Too many unknowns, more info needed...

smileys with beer

If it ain't broke, I'll fix it until it is! winking smiley

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Re: weber carb back fires when I turn off the car. #5
tweak chris b perth, western australia, Australia Sign in to contact 1934 MG J-Type Midget 1969 Austin-Healey Sprite "Little Red Car"	Sep 18, 2014 05:13 PM Joined 11 years ago 97 Posts

Hi Mark,

Whatever is causing it - may I respectfully suggest getting it sorted pretty quickly.

My chickens live in a 1972 Alfa 2600 shell - it was once a fine and quick car that I enjoyed greatly - a back fire through the air cleaners caused a fire ..............................

Although this is a recognised Alfa problem, webers is webers. I was told that the foam air cleaners get a mist of fuel in them, and that is very easy to ignite.

Kind regards,

Chris.

greatest invention in the history of mankind is beer. Oh, I grant you that
the wheel was also a fine invention, but the wheel does not go nearly as
well with pizza."
~ Dave Barry

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constamark thanked tweak for this post

Re: weber carb back fires when I turn off the car. #6
TeamEvil Thomas C (Disabled) Kingston, MA, USA Sign in to contact	Sep 18, 2014 05:19 PM Top Contributor Joined 12 years ago 5,815 Posts

My friend lost his TR8 in a car fire as well. a back fire through the Weber foam air-cleaner and that was it !

The filter element is pretty much foam shaped gasoline. It ignites with just a spark, same as the Edlebrock copies. Loads of info/comments on the web about this.

http://www.nastyz28.com/forum/archive/index.php/t-232357.html

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Re: weber carb back fires when I turn off the car. #7
constamark Mark Constable Amherst, NH, USA Sign in to contact 1972 MG Midget MkIII "Elizabeth"	Topic Creator (OP) Sep 19, 2014 11:13 AM Joined 9 years ago 5 Posts

Dave,
Yes the car will keep running for a short time after I turn it off. In most cases, if it turn the key back on and then off again, it will stop. The carb is a Weber DGV manual choke 32/36.

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Re: weber carb back fires when I turn off the car. #8
66jalopy Phillip Jolliffe Lake City, FL, USA Sign in to contact 1956 Morris Minor	Sep 19, 2014 12:08 PM Joined 11 years ago 6,727 Posts

Until you fix the problem, turn car off in gear and immediately release the clutch to stop the engine.

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Re: weber carb back fires when I turn off the car. #9
dlrhine Dave Rhine Columbia, SC, USA Sign in to contact 1978 MG Midget	Sep 19, 2014 04:21 PM Joined 14 years ago 4,598 Posts

Where do you have the idle speed & ignition timing set?

Could be just in need of a bit of adjustment...

If it ain't broke, I'll fix it until it is! winking smiley

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Re: weber carb back fires when I turn off the car. #10
constamark Mark Constable Amherst, NH, USA Sign in to contact 1972 MG Midget MkIII "Elizabeth"	Topic Creator (OP) Sep 21, 2014 11:47 AM Joined 9 years ago 5 Posts

Dave, I cant tell. We had to send the tach out to be repaired. It got fried with the rest of the wiring system. I'm trying to find someone local that might have a portable one. I know it is higher then is should be. Still need some work on the carb I think. I may breakdown and take it to a mechanic that remembers how a carb works.

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Re: weber carb back fires when I turn off the car. #11
littlecars David Bassett Nashville, TN, USA Sign in to contact 1963 Chevrolet Corvair "Cheeto!" 1965 Chevrolet Corvair "Ski Team Transport SOLD!" 1965 MG Midget MkII "Buffoon --- SOLD!!!" 1966 MG Midget MkII "Swiss Cheese...SCRAPPED" & more	Sep 21, 2014 02:29 PM Top Contributor Joined 12 years ago 8,388 Posts

My Weber backfired once too many times through the carb and once without the aircleaner mounted shot a flame straight up to my hood which had a melted-paint mark on both sides to remind me to continue tuning.

Hey..if you've melted part of your car's wiring you may have something that has bit the dust like the HI wire to the dizzy or the choke wire to the carb, if electric choke.

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Re: weber carb back fires when I turn off the car. #12
dlrhine Dave Rhine Columbia, SC, USA Sign in to contact 1978 MG Midget	Sep 21, 2014 03:46 PM Joined 14 years ago 4,598 Posts

In reply to # 2802830 by constamark I may breakdown and take it to a mechanic that remembers how a carb works.

Good luck my friend!

A lost art...

If it ain't broke, I'll fix it until it is! winking smiley

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