That bang is probably a backfire.
It is destroying your AFM.
When you're engine is just starting the flapper in your AFM is partially
open when you backfire it drives that flapper closed real hard and the
electronics in your AFM are taking a beating.
One little rod that sets the fuel pump microswitch will eventually bend and
they you get to walk home.
Set your timing and correct all your vacuum leaks before you're afoot.

Stan Wilder
Engine Ceramics
214-352-4931
www.engineceramics.com
----- Original Message -----
From: "Sam Johnson" <wrey45@YAHOO.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, March 10, 2005 7:43 PM
Subject: Loud Bang

> Hello Vanagon Gurus,
>                     First of all thanks for the tons of info that helped
> me to keep my Westy running for these past twenty one years (1984 Westy).
> I just replaced the original motor but I've noticed that one in every four
> starts causes a loud bang when first starting. Motor works great except
> for this loud bang on some starts. Any ideas as to what causes this -
> motor mounts perhaps?
>
> Sam
>
>
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>