I converted my 89 chevy astro over to the 16197427 (vehicle was converted to a 350 TBI a few years a go). I was having problems with the knock sensor wiring, originally I connected brown and blue together as desribed in this how to. This does not work on an 89 astro. On this vehicle brown is ground and black is the signal to the ECM (now PCM). This is probably an astro specific thing but there may be other GM TBI vehicles with this discrepency so I suggest going by the pinout of the ESC module which is as follows - pin A is empty, pin B goes to +12 volt, pin C is signal to ECM, pin D is ground and pin E to knock sensor. So connect the wires at pin C and E together. Oh and thanks goes to those who pioneered this conversion and those who have worked to perfect it!
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