Re: can't test knock sensor - Saab 9000 Bulletin Board - Saabnet.com
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Re: can't test knock sensor
Posted by Ron J (more from Ron J) on Fri, 1 Apr 2005 16:15:35
In Reply to: can't test knock sensor, boomshnka, Fri, 1 Apr 2005 14:19:18
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Your correct,you can't test the knock sensor by your methods.Think of it as a microphone it's job is to listen to engine noise and when the output level is high enough the DI/APC reduces the timing and the boost level.The program has to have a mininmum output level/time to confirm it's operational.With the amount of miles on your car i would not be cranking up the boost,imho your asking for trouble.I have seen a bad front wheel bearing noise limit the boost levels in Saabs.The system is doing it's job!!If you had a DSO(digital storage osciloscope)you could check it out.Other than that or a tuned ear you can't.
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