[Vwdiesel] smoking audi diagnosis

[Chris Jude]

well, i appreciate all the diagnostic advice from everyone.  i've driven the
car a couple times since reading the replies.  i've noticed that the car is
a little rough at idle, and will smoke for at least a minute after
starting.  the starting is difficult, as it has been since before any of the
recent work i've done.   but now it still hesitates a bit even once the
engine gets going.
i'm thinking it's a combination of a bad exhaust guide, along with needing a
valve adjustment.  though, with the new injectors, i hope that after fixing
this exhaust guide the car would start on the first couple cranks.
my mechanic thinks it'd be about 3.5-4 hours labor for a guide seal and
troubleshooting.
just hoping that's the right tree to bark up...  the car's not worth a big
hunt.

chris
1980 audi 5000s (diesel!)


On Tue, May 20, 2008 at 5:28 AM, Patrick Dolan <pmdolan at sasktel.net> wrote:

> My mistake.  Just stepped off of a 7 flight trip from other side of the
> world, and assumed when it said Audi, it was a gasser.  So few in NA
> actually HAVE an Audi diesel, never occurred to me it might be one.
>  However, a DIESEL injector that is letting unburned fuel pass will also
> have a miss that you couldn't.....er.....MISS (sorry, could "miss" the
> opportunity).
>
> ----- Original Message -----
> From: James Hansen <jhsg at sasktel.net>
> Date: Tuesday, May 20, 2008 0:50 am
> Subject: Re: [Vwdiesel] smoking audi diagnosis
>
> > Naw, not a valve adjustment issue.
> > verify stuff.  glow plug function, injector condition.  White
> > smoke as
> > in unburned fuel white smoke shouldn't last a couple blocks.
> >
> > Extensive blowby that accumulates in the intake, then gets sucked
> > in on
> > startup could.
> >
> > As Pat stated, a leaking valve seal may do that too, specifically
> > on the
> > exhaust side, where the oil is getting in after the hot stuff, and
> > getting spit down the exhaust pipe, where it smokes much like an
> > airplane manifold injection smoker for airshows.  That would take
> > a
> > while to burn off, like a couple of blocks....
> >
> > -james
> >
> >
> > Chris Jude wrote:
> > > stopped by a mechanics shop I've worked with before and was
> > asking his
> > > opinion about the Audi (1980 5000S).  It's been blowing bad
> > white smoke at
> > > startup since I rebuilt the head about a month ago.
> > > I noticed on the drive to work today that the car doesn't seem
> > to smoke much
> > > at all when being driven, and even when i got to work, at idle
> > it didn't
> > > smoke.  Then at lunch the car took about 10 seconds of cranking
> > to start,
> > > then blew white/grey smoke for about a block or two.  The same thing
> > > happened at the end of the day.
> > > I told him I wanted to do a valve adjustment on it, and the car
> > had a recent
> > > head rebuild job, and new injectors.  His first thought was that
> > there could
> > > be oil leaking into a cylinder, an injector could be leaking
> > fuel, or that
> > > maybe a valve was just too tight.  But he didn't seem to think a
> > valve> adjustment would solve the problem.
> > > I'm still going to go for the valve adjustment as soon as I can,
> > but it
> > > worries me to think that oil might be leaking past the gasket.  Oil
> > > consumption hasn't seemed to be a problem, but the car can
> > sometimes have an
> > > acrid smell, even when burning biodiesel.
> > > I didn't really understand  the leaky injector idea. But, i'm
> > not sure who
> > > 'remanufactured'  the Bosch injectors i got off eBay.  They
> > looked to be in
> > > good condition, but I didn't test  them before installing...
> > > anyone have any opinions?
> > >
> > > chris
> > > seattle
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> > >
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