[Vwdiesel] 2001 Golf smelly exhaust

[James Hansen]

Unless the intercooler pipe was off, and pointing in another direction, the
only air that the motor was sucking was unpressurized air, but clean stuff
that was pouring out of the intercooler ducting that faced the intake
suction.  Very little dirt gets injested when it happens that way, as more
air is coming out of the intercooler pipe than the engine can suck in.  The
oil that came from the duct collects in the intercooler over time, from the
engine crankcase.  This is the stuff that gets up to no good when it mixes
with the soot in the exhaust at the intake and eventually plugs the intake
manifold.
An unburnt fuel smell is likely just that.  Look carefully at and around the
injection pump, injector lines, return lines, etc.
If there is oil needing to be washed off the motor, do so, then you can tell
better where stuff comes from.   
Pop the t-belt cover and and peer around in there too, just to be sure no
seal is leaking and oil is getting flung onto something hot.
But, overall, if it's a fuel smell, look for fuel.  I had an injection
return line leak that just smelled, but not enough to be easy to see as a
leak.  The hot injector was evaporating the fuel as fast as it leaked.
-james

> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]
> On Behalf Of Rolf Pechukas
> Sent: Saturday, May 01, 2010 7:31 AM
> To: VW-TDI at yahoogroups.com; vwdiesel at vwfans.com
> Subject: [Vwdiesel] 2001 Golf smelly exhaust
> 
> hi gang
> some of you may remember my 01 Golf was re-assembled wrong after an
> alternator replacement by a local shop
> they left off the spring clamp on the hard plastic intake pipe
> as a result, the turbo blew the pipe off the hose and the engine was
> sucking in unfiltered air w/o the turbo boost
> the hard pipe ran into the serpentine pulley and was shredded up, and
> oil was spraying all over the engine compartment from the separation in
> the ducting
> I complained initially of VERY poor running, they encouraged me to
> 'drive it hard' to 'reset the computer'
> then I discovered the disconnected pipe, and they, to their credit,
> replaced the pipe for free and changed the oil
> 
> however
> 
> ever since this incident, the engine has been smelling 'bad'
> like unburnt fuel, disagreeable diesel smell
> before this, it was virtually odorless
> car is running fine, and economy is good - I am seeing 46-48mpg
> so it can't be running TOO bad
> 
> but what might cause smelly exhaust?
> anything else liable to have been contaminated/damaged by driving @30
> miles w/ intake duct disconnected?
> what got screwed up?
> 
> thanks for any thoughts,
> 
> Rolf in MA
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