Date: Wed, 3 May 2006 00:57:16 +0000 (UTC)
From: Craig's Saab C900 Site <c900nospam.apana.org.au>
Subject: Re: 1986 900 warm start running rich...


Paul Halliday <pjghnospamyonder.co.uk> writes: >in article 4bpm1nF10oi4aU1nospamvidual.net, Dave Hinz at DaveHinznospamcop.net >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 "http://www.classicsaab.net/library.html". 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 http://lios.apana.org.au/~c900 | http://www.classicsaab.net and other URL's Email: c900nospam.apana.org.au | For Saab 99/C900/9000 Enthusiasts World-Wide! Alternate: saabonautnospaml.com | Web-forums, galleries, library, links, etc.

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