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944 Ecology 944 Ecology is online now
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Join Date: Jul 2004
Location: Upstate New York
Posts: 3,280
The OP is looking for the thermo-time switch on his 81 924, which operates the fifth injector (cold start valve) when the engine is very cold. The part number is 928.605.101.00, and a picture can be found in the Pelican Parts catalog.

I believe that it is located in the rear of the block.

On my audi CIS cars, they were such a pain in the butt that I wired in a momentary on button in the dash to manually control the fifth injector when starting cold. A lot cheaper, too.
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Good luck, George Beuselinck
Old 10-06-2014, 02:40 PM
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