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RarlyL8 RarlyL8 is online now
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,527
I pulled my Bosch manual to verify what we discussed today. According to the manual which is specific for the early US/Euro 930s, the thermo time switch and the cold start injecter do indeed run in series.
That means the thermo time switch is aptly described; it will break the electrical connection to the cold start valve at both a preset time and temperature.
Should the switch fail in the closed position (least common) the cold start valve would remain on. Should the switch fail in the open position (most common) the cold start valve will not operate.

I cannot say that all 930s are wired this way but it would make sense that they are. I see no reason for the cold start valve to have its own power supply independant of the thermol time switch (unless used as a 7th injector, but that is a whole different ballgame and does not apply to your situation).

Others please chime in.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 02-25-2008, 08:23 PM
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