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

[robwill2 at wxs.nl]

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