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Registered
Join Date: Aug 2009
Posts: 13
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1980sc cold start problems
I have a cold start problem on my 1980 911sc. The car will start when I lift the air sensor plate for a second or two and then will start fine when warm. I have replaced fuel pump check valve and accumulator with no luck. Any suggestions would be greatly appreciated.
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08-07-2011, 04:33 AM
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Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
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Since you've replaced the check valve and accumulator, the next likely suspect for loss of residual pressure (which appears to be your problem) is the pressure relief valve inside the fuel distributor.
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
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08-07-2011, 07:19 AM
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Cold start? Do you have power to the CSV from the thermotime switch on the chain cover when cranking?
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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08-07-2011, 09:47 AM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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The thermotime switch provides the ground for the cold start valve. Make sure one of the terminals is grounded or you might have a bad switch.
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08-08-2011, 06:49 AM
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1985.5 Porsche 944 2.5L Supercharged 
911 SC
Panamera
