I had experienced the same pops and backfiring on deceleration. It was
caused by a leaking exhaust manifold to downpipe gasket.
Laurie Wilford
BN1, BT7, BJ8
>From: andy65 <andy65@snet.net>
>Reply-To: andy65 <andy65@snet.net>
>To: List Healeys <healeys@autox.team.net>
>Subject: pop and snap backfire on deceleration
>Date: Tue, 08 Jun 2004 11:48:47 -0400
>
>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?
>
>Andy
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