Six in line BMW dieseling issue

[Gerard C]

Hi there. Car is an historical BMW ex-TWR, six pot 3,5 litre running on Webers. Some issues plus "dieseling" (also called run-off I think). Any idea/advice? Thanks.

[Tel 911S]

Originally Posted by Gerard C

Hi there. Car is an historical BMW ex-TWR, six pot 3,5 litre running on Webers. Some issues plus "dieseling" (also called run-off I think). Any idea/advice? Thanks.

If it has been standing and not used for a while , then the carbs will need cleaning out as modern fuel will " Gum Up "the jets and other bits inside .
Then check fuel delivery rate to carbs , fuel levels in float chambers , and balance between all of the Butterflies so that they are all opening at the exact same time .
Then a new set of spark plugs , give it a run and see what the plugs look like .
They should all be a light brown colour .

Just another thought , if the ignition timing is retarded , that can also cause "Run On ".