1987 5kcdq acting very strange

[quk@sievers.com (Phil Payne)]

In message <UPMAIL01.199707301549350451@msn.com> "Stefan Bendevis" writes:

> I noticed that the 
> gas consumption increased greatly, a trip that uses about 2.0l of fuel now 
> uses about 3.2-3.5l.  When I'm on the highway and reach about 1.2 bar boost 
> pressure, the car hesitates and a cloud of black smoke comes out of the 
> tailpipe.  When the car is idling I no longer hear the famous Audi buzzing 
> sound. Yesterday I started checking the car, I had it idling in the driveway
> and I removed the oil cap from the valve cover and the engine did not stall
> (it is the MC engine with the QLCC chip in it).
> Today I will remove the air box and check the air filter and the plunger on 
> the fuel distributer.

Don't bother - that's not it.
 
It's obviously gone super-rich.  Most likely one of the O-rings in the metering 
head has failed,  or the warm-up regulator has gone ga-ga.  Check the warm-up 
regulator for continuity between the pins (there's a heater in there that might 
have failed).

Ideally, you should check system and control pressure in the fuel injection.  

-- 
 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club