she starts, she won't run - 1990 200QA Update 3

[Tony Hoffman]

When you go to rev it up, what happens if you lift on the sensor plate while
opening the throttle body? I'm just wanting to verify it's lean. Also, is
there oil in the michelin man hose? It sounds a lot like when the turbo went
on my 5ktq.

Tony

BTW, 140 should be fine.




On 1/28/07, David Michael <adavidmichael at gmail.com> wrote:
>
> I spent more time working on the ailing 200QA today, and it is not looking
> good. The biggest problem now is that it is blowing great billowing clouds
> of smoke or steam out the tailpipe. Which it did NOT do before I brought
> it
> to the mechanic. Initially the cloud is blue tinged, but after a few
> seconds, its mostly white. But it has essentially NO smell.I checked the
> compression on all the cylinders 165, 165, 162, 161 and 140. The 140 is a
> little worrisome. A little oil in the cylinder brought up the 170. So it
> would seem the rings are a little worn, but for a car with 120k, even 140
> is
> not horrible?
>
> It terms of getting the car to run, it will start and idle, but won't
> accelerate (never mind the embarrassment of the cloud I generate when I
> try
> to drive it). I checked the control pressure when cold. It measured 20 psi
> at 30F degrees. That seems high, which would make the car run lean. It
> should be closer to 10 I think, at least by extrapolating the curves in
> the
> ALLDATA CD. Anyone know for sure? The Bentley has values only down to 68F.
> The system pressure is correct. After the car had idled and warmed up, the
> OX sensor freq. valve was going to 85-90% (full lean), and then back down
> to
> 45-50%. This is with everything hooked up, (not  unplugged and
> disconnected per the Bentley for setting the mixture). But I do not think
> its supposed to swing wildly like that.
>
> I am not convinced that the smoke/steam clod and poor running are directly
> related. Not convinced that they are not either.
>
> Any suggestions on what to do next?
>
> Dave
> 90 200QA 220K
> 07 EX-L 4WD 0.003K (sad, but true)
> _______________________________________________
> quattro mailing list
> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro
> ---
> Watch this space for ads :)
>