Fuel mixture on 5KTQ?

[paul.heneghan@bbc.co.uk (Paul Heneghan)]

From: Daniel Hussey <GY3WSX@VM.SC.EDU>

>My mechanic said my car was running
>way too lean, so he turned up the fuel mixture.  Anyways, now the car is
>bucking under acceleration!  I am thinking the fuel mixture is too rich now 
and
>needs to be set back some.  Two questions: What is the proper air to fuel 
micture on
>these cars (5ktq)?  And, is this something I can easily adjust myself?  Any
>info appreciated.  Thanks in advance.

You probably have an vacuum/air leak.  Get a vacuum gauge (very cheap. 
<GBP20), plumb it into the vacuum pipes and see what it indicates.

Common places for leaks are:
perished vacuum pipes
perished engine breather pipes
split intercooler pipes
vulcanised o-rings on the injectors (very common)

All your mechanic has done (probably) is compensate for the increased air at 
idle by turning up the fuel.  At high revs, the ratio won't be right.

Ratio can be adjusted using long 3mm Allen key at CO adjuster in air flow 
box.

Paul
paul.heneghan@bbc.co.uk
1984 Audi 80 quattro
1989 Audi 100 Avant


                                                               Later,
                                                               Dan