EZK knock sensor - Saab 900 Bulletin Board - Saabnet.com
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4 flashes is the EZK knock sensor... Doesn't store a fault code, either. If the light is on solid, that's something else. Check Townsend's page or FAQs for info.
If it's really knocking while idling, either you got really bad gas, your spark timing is screwed up. Spark timing is controlled by Hall-effect sensor at crankshaft pulley, not real easy to get to.
False knocking signals can be a screwed up knock sensor. Maybe bad grounds or corroded wiring connections? Stand alongside the RH wheel, look between the middle 2 intake runners. The coolant temperature sensor has a blue plastic plug; the knock sensor is the round thing bolted to the engine block beneath that.
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