Re: Burnt Valve??

["Billy T." <btylaska@onramp.net>]

Maybe a vacuum leak as well...  check the hoses.

b-

Bill Hussey wrote:

> Well, your symptoms are typical of a running way too rich on the mixture, so
> before I checked for bad intake valves, I'd check your air passage ways.  Make
> sure a mouse hasn't found a nice warm home on top of your air filter and begun
> dragging food into the airbox to feed the new babies (happened to a friend of
> mine).   Replace the air filter if necessary.  Check to make sure no debris got
> in any of the hoses or that a hose has disconnected ... I'd then suggest having
> VW run a diagnostic on the fuel management system to verify that it's
> functioning properly - then try the valves.
>
> The idea of  your dad's is a little far reaching .... black exhaust has always
> meant first and foremost that you have a rich mixture, which no doubt could be a
> bad valve or two, but is much more likely a less costly problem to fix.
>
> Bill
> '98 GLX
>
> MAOberer@aol.com wrote:
>
> > Hi guys and gals...
> >
> > On my 95 Jetta, I have been noticing a rough idle lately, and haven't been
> > able to get rid of it.  I guess its been here for more than 6 months, but its
> > really starting to bother me now.  My car doesn't have the power that it used
> > to have, just seems like its lacking in the top end.  I just replaced the
> > spark plugs (78k miles now), and got some fuel injector and fuel
> > treatment....no help.
> >
> > Here are my symptoms:
> > --Lost power
> > --Rough Idle
> > --Smells rich with fuel from the exhaust pipe
> > --Some black residue inside the exhaust tips
> >
> > I talked to my dad about it, and he seems to think that I might have a burnt
> > valve, seeing as I have the black carbon inside my tailpipes.
> >
> > FYI, I have a Garret V.09 chip, Modified throttle body, K&N intake with
> > Airbath, stock exhaust, stock internal engine components.
> >
> > Any ideas or helpful hints???
> >
> > Matt