Guys,

Here's my dilema. I am picking up knock on my PCM (seeing it thru Datamaster) and it's pulling upto 12 deg timing. Now I cannot hear any audible knock whatsoever so here's what I've checked so far:

• Fuel Pump - New Racetronix and putting out the proper pressure
• KS circuit is stable at 5v
• KS is new and tq'd to 14flbs with no thread sealer
• No arching of wires
• Car doesn't seem to miss (however it's hard to tell with this choppy cam)
• Injectors all OHM out properly
• LT4 KM is installed
• No exhaust rattles, or leaks
• No vaccum leaks I can find
• Pulled VC's and the rockers look fine and are not loose

Now, I swore it was the KS picking up false knock so I replaced it. Before the new knock sensor it was picking up knock all over the place - randomly - and now it's primairly picking up knock at idle and pulling 12 deg at Idle? What else can I check? Could the plugs be bad? Check the resistance of the wires and see if I have a bad one?

Solomon has tuned my car and some guys say that his high timing can cause knock, but I have installed an old tune (before Solomon) and it still picks up knock the same?

I'm pulling my hair out here, any help is much appreciated!!!!

 

Just for grins, you might try attaching your old KS to the connector and securing it somewhere that it won't get any vibes (or let it dangle in the air). Then see if you are still pickup up any knock.

 

Damn, good idea Shoe Box, I'll do that tonight and see what happens. Any other ideas guys. The knock being detected is only at idle and goes away when I give it gas.

 

You have to ground the sensor when you attach it to the single wire connector, or you will get a code and you will have almost constant variable knock retard.

Did you check the voltage WITH THE CONNECTOR ON THE SENSOR? That has to be in the range of 1.5 - 3.5V to avoid setting a code.