Code 43
I have a code 43 on my 89 astro. Wondering how I find the exact problem. In the manual a Code 43 is either low voltage in EST (electronic spark timing) or ESC (electronic spark controller). On a website I went to it said a Code 43 was the ECM not detecting a knock signal at near wide open throttle at coolant temperature above 194 degrees. I have never owned a vehicle with so many sensors before and I feel a bit over-whelmed when this stuff happens. Does it involve testing with a volt meter or is there another way. Any help is much appreciated. Thanx
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