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

[Grant Lenahan]

Two thoughts:

1. Does the car have a cold-enrichment injector? Check it.

2. If the lean condition only occurs when cold, then the distributor is 
likely under-measuring the mass of air flowing when cold.  I think, but 
may be wrong, you system still uses a mechanical airflow sensor (the 
plunger plate?)  might just be sticky when cold. Clean or lube it if 
you are brave.

If its an e-system, sounds like a misbehaving MAF when cold.

Grant

On Jan 19, 2007, at 10:58 PM, David Michael wrote:

> Well, after 12 years of owning a type44, the love affair may be 
> ending.  Our
> beloved 1990 200QA is seriously misbehaving. When cold, its starts
> immediately, and then just as quickly dies.
>
> I ran through the archived, and found a posting  from someone who had
> exactly the same problem. Turns out that someone was ME - about 8 
> years ago.
> The problem then was a vacuum leak through the valve cover gasket.
>
> Unfortunately, not so easy this time. I rpeaced the gasket last year.  
> The
> car has been at an experienced Audi mechanic for three weeks. They have
> checekd all the sensors, all the pressures and all the control signals,
> found no vacuum leaks and they said they all  checked out nominally. 
> What
> they told me is that there seems to be something in the fuel 
> distribute that
> is creating too lean a condition, but the only way to be sure was to 
> replace
> it. At which point I said stop. This all came on rather suddenly - the 
> car
> started fine through the 8 winters an  all through the summer and 
> fall. But
> when it got below 30 (finally), then it started misbehaving.
>
> I am not really asking for advice hear, since I no longer have much 
> time to
> got out and fiddle with the car. I will check the valve cover gasket 
> again,
> since but short of that, I am stumped.
>
> I am bummed.....
>
> Dave
> 1990 200QA
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