[Vwdiesel] smoking audi diagnosis
pmdolan at sasktel.net
Wed May 21 23:20:12 PDT 2008
As in the other reply, exhaust guide will not bother starting.
You (or your mechanic) needs to go back to square one and do the basic diagnosis procedures before spending a bunch of time and money chasing rainbows.
What is compression (take glow plugs out and do compression test) ?
Are glow plugs working (check for resistance) ?
Are injectors working properly (pop test and observe spray)?
Is timing right (check timing)?
If I remember, you just had the cylinder head off. 99% of the time, anything that starts right after a repair simply means that something wasn't done right in the repair. If someone else did the work, it is a shop comeback and they need to put it right. In failure investigations, as in so many other matters, you can safely work on the assumption that there are no co-incidences.
----- Original Message -----
From: Chris Jude <vegbenz300 at gmail.com>
Date: Wednesday, May 21, 2008 10:34 pm
Subject: Re: [Vwdiesel] smoking audi diagnosis
> 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
> just hoping that's the right tree to bark up... the car's not
> worth a big
> 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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> > > > Vwdiesel at vwfans.com
> > > > http://www.audifans.com/mailman/listinfo/vwdiesel
> > > >
> > > >
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> > > Vwdiesel at vwfans.com
> > > http://www.audifans.com/mailman/listinfo/vwdiesel
> > >
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