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1980 911 SC AAV, AAR

Fuel System

Vehicle Information: Model: 911S; Year: 1977; Body Type: Coupe; Total Mileage: 166000 (chassis) 70000(engine);

I am experiencing the typical cold start sputtering and banging symptoms that suggest either vacuum leaks or auxiliary air valve or auxiliary air regulator problems. I have already replaced the WUR which helped a lot with both cold and warm running. I also have the airbox pop valve installed. I am finding it difficult to access the AAR and AAV. Should I have my mechanic drop the engine, or can I just remove the air box (and, if so, how do I do this?)?. I have tried to remove the curved metal pipe with the rubber end from the passanger's side of the AAR, but it doesn't want to budge. Should I try Penetrating oil or WD40 on the end of the pipe to loosen it? Is there enough play in the pipe and connections for it to move out of the way to examine the AAR operation, without damaging the pipe?

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