Re: T7 works well - Saab 9000 Bulletin Board - Saabnet.com
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Re: T7 works well
Posted by BobS (more from BobS) on Wed, 17 Aug 2011 19:33:12
In Reply to: T7 works well, Noel, Wed, 17 Aug 2011 18:11:49
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25 PSI is really pushing it, hope you don't use it often. My son would not run his Saabs over about 22 PSI, his Evolution is something else.
The ECU transistors either work or not. They malfunction by shorting or going open like a fuse. Shorting is caused by excessive current from shorted winding in a BPC coil, which over heats and melts the transistor internals. A shorted transistor should blow fuse #5. If excessive current continues, or is really high, like a dead short, the transistor internals will blow open. This can happen much faster than fuse #5 can respond, since the transistor internal conductors are much smaller than the fuse element.
A shorted transistor would not operate the BPC very well if at all (it would tend to hold the disc to one side), and could damage the BPC coil. Generally I think a coil goes bad first by partially or intermittently shorting, which then over heats and shorts the transistor, and if the short is bad enough, the transistor blows. Some transistor maybe damaged by people sparking around. At one time there was a bad batch of BPC valves that failed very quickly, I had one last only a couple weeks
posted by 65.101.94...
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