Date: Wed, 3 May 2006 00:57:16 +0000 (UTC)
From: Craig's Saab C900 Site <>
Subject: Re: 1986 900 warm start running rich...

Paul Halliday <> writes: >in article, Dave Hinz at >wrote on 02/05/2006 19:17: >> This car has CIS injection. >I have a year 2000 Bosch K-Jet manual if you're interested (in PDF). I'll >drop it in your inbox if so :) I've got a Bosch CIS manual available for downloading from the tech library page on my site at "". Could well be the same document you have as the one I've got is PDF as well. But yes the thermo-time switch is the device which controls when the cold-start injector receives power. The t/t switch is actually a double-purpose device since it has a heating element that slowly heats the body of the device at a pre-set rate after 12 volts is first applied to it, plus it absorbs heat from the engine so when the engine is above a certain temp it won't allow the cold-start injector to operate on cranking/starting. The Bosch t/t switch that Saab used with 8V engines in c900's is the one ending in -217. You can't really use a different one since they're made with quite widely varying settings for cut-off temp and heat-up time, but if you're lucky to find one that's close it'd be ok. I don't know if they all have the same thread size/pitch - maybe the one for the Saab engines isn't interchangable at all. There are checks to make sure the thermo-time switch and cold-start injector are working properly and they're simple to do with a multi-meter, etc. The bentley manual covers this well on pages 240-10 and 240-11. It's helped me diagnose the fault with the t/t switch on the engine in the turbo car I'm fixing - it's heater resistance was varying massively with any vibration or just a touch of my fingers on the wire harness and it was probably a dud internal electrical connection to the bi-metal strip. Good luck solving the problem. Craig. -- Craig's Saab C900 Page at | Craig's Classic Saab Workshop - Sydney .au | and other URL's Email: | For Saab 99/C900/9000 Enthusiasts World-Wide! Alternate: | Web-forums, galleries, library, links, etc.

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