brucelee

iTrader: (3)

So I was driving my 99 z28 the other day and my ses light came on. I had the code pulled at autozone and all that came up was knock sensor low voltage. Has anyone had experience with this and if so what is the solution?

Thanks,
Steve

01WS6/tamu

iTrader: (37)

Replace the knock sensor harness and both knock sensors. Throw away the rear foam baffle on the intake and then build a dame 3/4 of the way around the rearmost knock sensor using gm grey rtv silicone. They usually fill up with water rust out and then fail. The above is a gm tsb to avoid a repeat in the future.

brucelee

iTrader: (3)

would the low voltage also cause it to pull timing or no?

brucelee

iTrader: (3)

replaced both knock sensors, and I still have the same problem. any ideas?

2001NBMZ28

If you can hear a knock could be a mechanical issue, and yes, the PCM retards spark timing. Visit gearchatter.com and look up P0327/P0332 for your year for description/diagnostics.