Shifting backfire

[Rabbit16v@attbi.com (Rabbit16v)]

Not necessarily, Dan.  If it is jumping around it could just be a rough or
irratic idle.  I think this is what he is talking about in the first place.
Shining the t-light on the timing marks and the timing looks to be jumping
around.  There is a possiblity that the key is broken but it is dependant on
what he means by "timing jumping around" I guess.

Dave
----- Original Message -----
From: "Dan Bubb" <jdbubb@ix.netcom.com>
To: "calimus" <calimus@techography.net>
Cc: "Scirocco-l" <scirocco-l@scirocco.org>; "John Lagnese"
<jlagnese@massed.net>
Sent: Monday, February 10, 2003 5:04 AM
Subject: Re: Shifting backfire


> Just as a quick check shine your timing light on the crankshaft pulley.
> If it's jumping around then your crank to timing pulley key is shot.
> That'll make both ignition and cam timing jump around.
> As far as the exhaust pop, my experience is this is almost always an
> exhaust leak (yep I read you have new mufflers) that allows air into the
> exhaust on overrun and lights off any fuel in the pipe causing the pop.
> Dan
>
> calimus wrote:
> >
> > I could be wrong, but if your timing is jumping then that very well
could be
> > the cause of your backfire problem.  Actually, I would almost bet money
on
> > it.  As for why it's jumping, the timing belt would be the first thing I
> > looked at.  Replace it and if it continues, you might want to look at
the
> > tensioner being faulty.
> >
> > William
> > ----- Original Message -----
> > From: "John Lagnese" <jlagnese@massed.net>
> > Cc: <a2-16v-list@mail.a2-16v.com>; "The List" <scirocco-l@scirocco.org>
> > Sent: Monday, February 10, 2003 12:54 AM
> > Subject: Shifting backfire
> >
> > > Hi,
> > > I'm getting a curious problem in my daily driver. Its a 91 Jetta GL
8V.
> > Its got
> > > 194K. When I shift above 4k there a small pop, like a backfire? Do I
have
> > a
> > > sticking valve? Its got a new mid and rear muffler, so the exhaust is
> > tight.
> > > Also same vehcile, why would the timing mark jump around? Is my timing
> > belt
> > > tired?
> > > Thanks,
> > > John
> > >
> > >
> > >
> > >
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