[s-cars] Occasional Smoking - continued

[Scott Justusson]

He hasn't put the turbo in yet Cody!  White 'smoke' could be a failed/failing/choking catalyst, could also be leaking headgasket.  The white smoke from catalyst could be related to the HC issue or the HG problem.  fuel pressure regulator, fuel injector/s, MAF, vacuum leak, TPS, 02 bad, bad engine temp sender.  White smoke from leaking headgasket should result in a sweet smell from the exhaust.  You should also do that leakdown warm, and then check for pressure in the A/F reservoir

All that said, your compression and leakdown don't look like the problems would be internal.  I bet you flunk test/s in the fuel diagnostic tree.

HTH

Scott J
95.5 S6

 

 

 

-----Original Message-----
From: Cody Forbes <cody at 5000tq.com>
To: Brian Pleet <subscriptions at strategico.ca>
Cc: s-car-list <s-car-list at audifans.com>
Sent: Thu, Nov 7, 2013 7:58 am
Subject: Re: [s-cars] Occasional Smoking - continued


I very recently had a turbo failure that would smoke only occasionally. It 
started out as once a month or so it would smoke horribly while sitting at a 
stop light. It got more frequent until it was roughly 1 out of 5 times I let the 
engine idle for more than 10 seconds. Also on decel down hills occasionally. I 
initially thought it to be a sticking piston ring, but investigation proved it 
to be the turbo oil seal to the turbine side.

-Cody Forbes (mobile)

On Nov 7, 2013, at 3:13 AM, Brian Pleet <subscriptions at strategico.ca> wrote:

> My 90 90Q seems to know it's approaching 250k km by acting her age.
> 
> For a few weeks the idle went wild, she belched (white) smoke erratically,
> she'd threaten to stall (but never did) on deceleration.
> 
> Having gained my full attention, I did a compression test, followed by a
> leak down test; Head was rebuilt @ 125k, lower block is all original. I
> have a rebuild able 3B avalable for building a sleeper car.
> 
>         CYL   COM           WET    DRY    LOSS%
> 
>   - #1       9.6,            10.0      6.5     0%
>   - #2      10.5            10.5      7.0     17%
>   - #3        9.7            10.5      7.0     5%
>   - #4        9.5            10.0      6.5     0%
>   - #5        9.7            10.5      7.00    0%
> 
> Cleaned the ISV, replaced the O2 sensor, cleaned air filter, replaced the
> rotor and cap and put it all back together. For the past 3 days she's been
> purring...except
> 
> The plugs are covered with a black dry soot and it smells of hydrocarbons.
> On occasion, if I watch in the mirror, I can cover the car behind in white
> smoke (like James Bond) If I measured mileage  it appears to be down. Oil
> consumption is a little elevated.
> 
> She's giving me hints but I can't talk to her (blink test says she's fine)..
> 
> 
> Suggestions?
> 
> 
> Brian
> 90 90Q
> 95,5 URS6
> 09 TT on the way
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