[Vwdiesel] smoking audi diagnosis

[James Hansen]

An exhaust guide won't affect starting, unless it's so bad it won't let 
the valve shut.  It may leak oil, let smoke back into the engine but not 
hamper starting.  Starting is timing, compression, glow plugs, 
injectors.  From your description I would tackle valve set and injectors 
first, at the same time even, then it's easier to turn over to do the 
valve set.

Good motor or bad motor, you can always use a good set of injectors on 
the next one to come along, so no real loss.
James

Chris Jude wrote:
> 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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>>>> http://www.audifans.com/mailman/listinfo/vwdiesel
>>>>
>>>>
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>>>
>>
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