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Shifting backfire
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Dan-
If the ignition timing(bad belt, distributor, etc.) is erratic, it =
will make the crank pulley appear erratic using your method. Remember, =
the timing light gets its trigger from the ignition.
No biggie....
Larry
sandiego16v
----- Original Message -----=20
From: Dan Bubb=20
To: calimus=20
Cc: Scirocco-l ; John Lagnese=20
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:
>=20
> 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.
>=20
> 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
>=20
> > 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
> >
> >
> >
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
>=20
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l
_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org
http://neubayern.net/mailman/listinfo/scirocco-l
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<DIV><FONT face=3DArial size=3D2>Dan-</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> If the ignition timing(bad belt, =
distributor, etc.) is erratic, it will make the crank pulley appear =
erratic=20
using your method. Remember, the timing light gets its trigger =
from the=20
ignition.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>No biggie....</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>sandiego16v</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:jdbubb@ix.netcom.com"; =
title=3Djdbubb@ix.netcom.com>Dan Bubb</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:calimus@techography.net"=20
title=3Dcalimus@techography.net>calimus</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A=20
href=3D"mailto:scirocco-l@scirocco.org"=20
title=3Dscirocco-l@scirocco.org>Scirocco-l</A> ; <A=20
href=3D"mailto:jlagnese@massed.net"; title=3Djlagnese@massed.net>John =
Lagnese</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, February 10, 2003 =
5:04=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Shifting =
backfire</DIV>
<DIV><BR></DIV>Just as a quick check shine your timing light on the =
crankshaft=20
pulley.<BR>If it's jumping around then your crank to timing pulley key =
is=20
shot.<BR>That'll make both ignition and cam timing jump around.<BR>As =
far as=20
the exhaust pop, my experience is this is almost always an<BR>exhaust =
leak=20
(yep I read you have new mufflers) that allows air into the<BR>exhaust =
on=20
overrun and lights off any fuel in the pipe causing the=20
pop.<BR>Dan<BR><BR>calimus wrote:<BR>> <BR>> I could be wrong, =
but if=20
your timing is jumping then that very well could be<BR>> the cause =
of your=20
backfire problem. Actually, I would almost bet money on<BR>>=20
it. As for why it's jumping, the timing belt would be the first =
thing=20
I<BR>> looked at. Replace it and if it continues, you might =
want to=20
look at the<BR>> tensioner being faulty.<BR>> <BR>> =
William<BR>>=20
----- Original Message -----<BR>> From: "John Lagnese" <<A=20
=
href=3D"mailto:jlagnese@massed.net";>jlagnese@massed.net</A>><BR>> =
Cc:=20
<<A=20
=
href=3D"mailto:a2-16v-list@mail.a2-16v.com";>a2-16v-list@mail.a2-16v.com</=
A>>;=20
"The List" <<A=20
=
href=3D"mailto:scirocco-l@scirocco.org";>scirocco-l@scirocco.org</A>><B=
R>>=20
Sent: Monday, February 10, 2003 12:54 AM<BR>> Subject: Shifting=20
backfire<BR>> <BR>> > Hi,<BR>> > I'm getting a curious =
problem=20
in my daily driver. Its a 91 Jetta GL 8V.<BR>> Its got<BR>> > =
194K.=20
When I shift above 4k there a small pop, like a backfire? Do I =
have<BR>>=20
a<BR>> > sticking valve? Its got a new mid and rear muffler, so =
the=20
exhaust is<BR>> tight.<BR>> > Also same vehcile, why would =
the timing=20
mark jump around? Is my timing<BR>> belt<BR>> > =
tired?<BR>> >=20
Thanks,<BR>> > John<BR>> ><BR>> ><BR>> =
><BR>>=20
><BR>> > =
_______________________________________________<BR>> >=20
Scirocco-l mailing list<BR>> > <A=20
=
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR>&g=
t; >=20
<A=20
=
href=3D"http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayer=
n.net/mailman/listinfo/scirocco-l</A><BR>>=20
<BR>> _______________________________________________<BR>> =
Scirocco-l=20
mailing list<BR>> <A=20
=
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR>&g=
t; <A=20
=
href=3D"http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayer=
n.net/mailman/listinfo/scirocco-l</A><BR><BR>____________________________=
___________________<BR>Scirocco-l=20
mailing list<BR><A=20
=
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR><A=
=20
=
href=3D"http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayer=
n.net/mailman/listinfo/scirocco-l</A><BR></BLOCKQUOTE></BODY></HTML>
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