ironheadvette

Hi everyone - I'm coming over from the C1/C2 Forum - since I have a 61 Restomod with a 2001 LS6 engine. My check engine light is on, and I'm getting the dreaded error message "Knock Sensor - Bank 2".

So, I order two new GM sensors and tear off the intake. The wiring is fine, but the rear sensor has oil on the connector and Down in the hole. I know this didn't come in from the top of the valley cover - the sensor was tight.... So do I need to replace seals on the Valley cover?

This isn't a 20 minute job, so I don't want to button it all back up and then get the code again.

Ideas?
Thanks.

HPS MASTER TECH

yes. replace the round seals on the bottom

chain_5001

Its also common to replace the wiring harness along with the knock sensors.

ironheadvette

After pulling the intake and the valley cover - I see the round seal for the rear sensor laying on the top of the block. Easy to see why the oil was all over my sensor.

Bought Felpro gaskets - and first thing I ran into was the Valley cover was an aluminum gasket with the rubber attached to it - vs the cover it'self - which had an intact rubber seal glued to it. So.. I pressed out the remaining round seals, and installed the two new ones. I decided to just install the valley cover with the intact gasket, as it wasn't leaking, and I wasn't sure if I should scrape it off for the new Felpro one.

Installed the wiring harness - will replace the gaskets on the intake, and button her up.
One good thing about this process - I discovered an open vacuum port below the large port for the power brakes. Plugged that up.

Thanks for your help
Ironheadvette

HPS MASTER TECH

that port would be for ac controls.

ironheadvette

So I'm carrying my LS6 intake out the door (to dump the gas) and I feel this little plastic piece hit my shoe... (see pictures - included a knock sensor for size comparison)

I don't see anyplace for it on the intake, and I don't remember pulling off a wire connector with anything like it.

Any ideas?

Thanks

HPS MASTER TECH

that is half of a fuse puller.

ironheadvette

Wow... I might even have to look for the other half now.

This is very much appreciated.

Thanks again.
BB