Re: Burnt Valve??

[Bill Hussey <vfrboy@home.net>]

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