Re: quattro-digest V4 #2821

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <ea4efcb5.360f359a@aol.com> Vbonz@aol.com writes:

> I have a '90 200q and have been experiencing erratic stalling.  The car never
> stalls when it sits for a while and then is started.  It stalls when after
> running for a while is shut down and is started again within  2 hours.  The
> car will then stall on startup but not after you start driving.  It seems to
> be more of a problem when it is hot and/or humid.  Any suggestions.

Is the 1990 still CIS-E, or is it Motronic?  If CIS-E:

Fuel system residual pressure leak-down.  Attach a pressure gauge to the
fuel system and watch the residual pressure when the engine is switched
off.  It should fall to around 2.8 bar but no further.

a) Take the car to a Bosch fuel injection specialist, not an Audi dealer.

b) Order to check:

   - cold start valve - pull it, is it dripping?
   - system pressure control valve - disconnect return line. Dripping?
   - fuel system check valve - a bit tougher - undercar clamping job
   - injectors - just plain tedious - check spray pattern while they're
     out

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
 (The contents of this post will _NOT_ appear in the UK Newsletter.)