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Backfire from intake
Posted by: GioGio ()
Date: July 13, 2022 03:46AM

My 66 automatic wants to backfire through one carb when cold. Also, after it warms up and you ease into the throttle it will hesitate and sometimes backfire through the same carb, but if you slam the accelerator down it does not hesitate or backfire. I have changed out that carb with 2 others to no avail. Any Ideas, Timing is good and have electronic ignition.

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Re: Backfire from intake
Posted by: vairmech ()
Date: July 13, 2022 09:11AM

There has to be some sort of vacuum leak causing a minor lean condition.
And then what about swapping carbs side to side? Does the issue follow the carb or stay on that side?

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Backfire from intake
Posted by: GioGio ()
Date: July 13, 2022 09:48AM

It stay on that side how can in check the vacuum? ????

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Re: Backfire from intake
Posted by: American Mel ()
Date: July 13, 2022 01:41PM

I think you found where your "Booping" noise is coming from!

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WA. state, 1 mile south of the Canadian border, I am not at the end of the world, but you can see it from here.

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Re: Backfire from intake
Posted by: GioGio ()
Date: July 13, 2022 08:54PM

I did not find any vacuum leak for now

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Re: Backfire from intake
Posted by: corventure Dave ()
Date: July 13, 2022 11:45PM

You may want to check for a broken intake valve spring.

Corventure Dave

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Re: Backfire from intake
Posted by: RobertC ()
Date: July 14, 2022 01:45AM

You have given no indication that you have the needed shop manuals or Bob Helt's book on Rochester carbs.

You cannot just swap carbs. For best performance, the carbs need to exactly match. There are slight differences over the years.

Given the "poor" condition of the motor in your previous pics, you cannot hack your way to a properly performing Corvair engine.

As previously stated, maybe the problem is beyond the carbs.

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Re: Backfire from intake
Posted by: GioGio ()
Date: July 14, 2022 03:55AM

Yes i have the book and i rearrange all the vacum line and all the missing pieces thatvwas needed gonna,check the valve tonight to make sure everything isbgood i learning here i am sorry!

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Re: Backfire from intake
Posted by: corventure Dave ()
Date: July 17, 2022 09:00PM

No problem GioGio.
Keep us posted as to what you find.

Corventure Dave

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Re: Backfire from intake
Posted by: RobertC ()
Date: July 26, 2022 01:05PM

Ontario club states it has members in New Brunswick.

[www.corsaontario.com]

Maybe you can find someone to help you.

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