Before completly rebuilding my BJ8 engine and carbs and adding a new
exhaust system, I had a horrible pop/snap/backfire when decelerating.
Matter of fact, noone would follow me when we went on a cruise.
Not suggesting this is what you need to do to eliminate the problem:), but
seems the combo of the three eliminated mine---more suspect of the carbs.
Now, there is basically none of these things but a very smooth sound when I
decelerate.
Cheers
tom
> [Original Message]
> From: Frenken, Eric <efrenken@lctax.de>
> To: <healeys@autox.team.net>
> Date: 6/9/04 3:27:01 AM
> Subject: RE: pop and snap backfire on deceleration
>
> Andy,
>
> I agree with the others saying it could be an exhaust leak. Another
option to look for is the vacuum advance, which you say is not working. As
far as I know one of the functions of the vaccuum advance is to advance the
ignition timing when decelerating. Gas is burning slower when decelerating
(don't ask me why, read it somewhere) and with vacuum advance not working a
certain amount of unburned fuel will leave the cylinders burning in the
exhaust causing backfiring.
>
> Eric BT7
> Heinsberg/Germany
>
>
> -----Urspr|ngliche Nachricht-----
> Von: andy65 [mailto:andy65@snet.net]
> Gesendet: Dienstag, 8. Juni 2004 17:49
> An: List Healeys
> Betreff: pop and snap backfire on deceleration
>
>
> BJ8 - When I decelerate I often get loud pops and snaps and sometimes a
> backfire that sounds like the crack of a rifle shot. Only happens when
> decelerating briskly and foot is off the pedal or less than one quarter
> throttle. Plugs look normal to blackish. Vacuum advance is not working.
> Checked timing and it is ok. Otherwise seems to run fine. Where do I
look
> next?
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