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BackintheFold · 01-09-23, 09:01 AM

BTW.. I have discovered another trick... If I just turn the ignition on and off (without starting the engine) twice and then turn the engine on, the car starts up and drives well. Sometimes the engine surges from 800 to 1100 rpm when idling, but otherwise OK..

It's definitely pointing to a problem pump or return valve...

I don't think this points to a "dumb" component, as I can't see why the start up procedure would do anything to the fuel pump and non return valve.
It says to me its an electrical/sensor issue.

I regrert I can't be more help with what one!

01-09-23, 09:01 AM	#33
BackintheFold Senior Member Classic Audi Club Member Join Date: Feb 2019 Location: Near an MB ur Quattro Posts: 1,190	BTW.. I have discovered another trick... If I just turn the ignition on and off (without starting the engine) twice and then turn the engine on, the car starts up and drives well. Sometimes the engine surges from 800 to 1100 rpm when idling, but otherwise OK.. It's definitely pointing to a problem pump or return valve... I don't think this points to a "dumb" component, as I can't see why the start up procedure would do anything to the fuel pump and non return valve. It says to me its an electrical/sensor issue. I regrert I can't be more help with what one! __________________ 2006 A3 (daily drive) 1987 MB ur