Backfiring (out of the exhaust) on the overrun is usually caused by a faulty
gulp valve. It is the air pump that causes the backfiring, and the gulp
valve that is supposed to prevent it. All emissions kit would need to be in
good condition, and the ignition and carbs in a good state of tune. Get all
those right then see what happens.
PaulH.
----- Original Message -----
From: "Alan Harriman" <vtech@usol.com>
To: <mgs@autox.team.net>
Sent: Tuesday, August 17, 2004 2:06 PM
Subject: 1980 MGB Tune up (air pump question)
> The previous owner had also removed the air pump belt, but otherwise the
> emissions system seems to be intact. However, when I reinstalled the air
pump
> belt, the engine to start backfiring and generally run very poorly. I'm
curious
> what would cause that.
Check out the new British Cars Forum:
http://www.team.net/the-local/tiki-view_forum.php?forumId=8
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