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Bland
Join Date: Nov 2003
Location: I'm 'out there...'
Posts: 8,782
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My 86 930 does this too. I kinda think it’s related to the massive inter cooler I have in it. I *think* you need to have vacuum for the distributor to have the correct advance to start.
Having no IC on your 77, this may not be the case.
I would start by checking for vacuum leaks if I was you, particularly your Turbo which were notoriously bad on the 76 and 77 cars. I know the turbo on my 86 needs to be rebuilt and I think this is my issue.
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06 Cayenne Turbo S and 11 Cayenne S
77 911S Wide Body GT2 WCMA race car
86 930 Slantnose - featured in Mar-Apr 2016 Classic Porsche
Sold: 76 930, 90 C4 Targa, 87 944, 06 Cayenne Turbo, 73 911 ChumpCar endurance racer - featured in May-June & July-Aug 2016 Classic Porsche
Last edited by unclebilly; 12-24-2020 at 07:13 AM..
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