no nice running of old 2.0 litre Audi 100 engine..

[Joshua Van Tol]

>Hi group,
>
>My other Audi 100 Typ 43 car, standing for about 8 (!)
>years now, presents the following problem:
>
>After a long time of standing the pistons don't seem to be
>corroded to the cylinders.. :-))
>I injected some engineoil in the spark-holes on each
>cylinder (4 -pot engine, 2.0 litre, 115 hp, carburettor)
>I cleaned the plugs and screwed them in again..
>A freshly loaden battery attached: with the help of 'start
>pilot' stuff sprayed in the carburettor-venturi and some
>churning the engine ran.., drinking out of a jerrycan with
>fuel, as the tank has deposits in it..
>
>But: I need to half-depress the throttle to keep it running:
>easing it let the engine stop..
>As it doesn't seem an electrical problem (then it wouldn't
>start at all), could the fuel or air needles be the cause??
>Only some are accessible when I take off the air-cleaner
>housing (it the Pierburg 2-step carburettor), but on
>explosion-pictures I have, there are some jets inside, but
>I can remember I ever tried to open the carburettor itself
>(upper from lower half), but I didn't get it...
>Would the accessible jets and cleaning (blowing through
>them) make a difference??
>
>BTW: on starting/running there is some backfire out of
>the carburettor-venturi (I saw real flames erupting!): this
>would mean the ignition is not set right??
>I do have a flashlamp and revolutioncounter to regulate
>the 'schliesswinkel', but to do so the engine must be
>running on its own (about 950 rpm)..
>
>Maybe you have some useful thoughts on this??
>
>TX
>Robert
>robwill2 at wxs.nl

The carb is full of gunk. Gauranteed. You'll need to completely 
dissassemble it, soak in carb cleaner, and re-assemble with new 
gaskets, etc. Or you could replace the carb with a new or rebuilt 
unit, but this is likely to be very expensive. Cleaning the jets that 
are accessable MIGHT make a difference, but it's kind of unlikely 
that you could get it to run perfectly that way.
-- 
Joshua Van Tol -- josh at spiny.com