ZR6 knock sensor issue

[AirTool]

Temp is 162,5 degrees fahrenheit came from 170,6 degrees (thermostat open)

Was that in the scan tool or on the dash?

I'm still wondering if the code comes on when the ECM confirms the engine is "warm" and changes control/advance schemes. I'm not sure where that takes us, though. A problem with the ECM internally or the knock sensor loops....but both loops were reported. I believe they are independent from what I've read....and you got two codes. That might point to the ECM and not the sensors.

HOWEVER.....

I can't remember where the ignition control module fits into all of this. I can't recall on the newer model if the advance is controlled by the ignition module or the ECM. On my old (OBD1) chevy truck, (IIRC) the ignition module handles all that during cranking (below 400 rpm) and in open loop a.k.a "cold". Then the ECM handles it in closed loop. Your boat has no closed loop because there are no O2 sensors. So, if the ignition module controls the advance and it is malfunctioning, advance goes to crap after warm up, knock is detected and the codes are thrown.

Please forgive all the commas and any typos. I am in South America, taking a break from the work insanity, and somewhat brain dead.

I believe your ignition module can be tested at an auto parts store....try to find a test machine that heats it up....because that is when they go crazy. I've seen it many times in autos.

[mklaaijsen]

We have solved the issue..!!

First we replaced the knock sensors with automotive sensors of a 2006 Hummer, to some forums they were interchangable and cheaper... well, they weren't.

We ordered the original PCM knock sensors through an official dealer, installed them, and we haven't seen the knock sensor error code anymore, the machine is running like a charm now.
Everytime we went out on the lake during the first or 2nd wakeboard session we were sure to see the problem

We now have taken her out for lik 7 - 9 times, with the new knock sensors and no problems anymore.

Thanks all, especially AirTool for the support and suggestions.!

-- One happy member --

[zoolander]

are there any diagrams on how to replace the knock sensor?

[AirTool]

read this http://www.planetnautique.com/vb3/sh...7-Knock-sensor