Knock Sensors
Thread Starter
Instructor
Joined: May 2001
Posts: 127
Likes: 1
From: Yorba Linda, CA,,,USA
Knock Sensors
I replaced the Oil pressure sensor, which required the removal and replacement of the intake manifold. Now after about 10 minutes of driving I get a check engine light with codes P09332, and P0337. This indicates that the Knock sensors has issues. Any suggestions?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Did you unplug the KNOCK SENSOR Connector or damage the Knock sensor wires during the intake manifold reinstallation?
I would remove the intake, inspect the sensors, the connectors on the sensors, the wiring and harness connector at the back of the block. Also make sure that the sensor wells are clean and dry inside
Make sure you use RTV sealant and seal the knock sensor rubber covers to the plate to help keep water out of the sensor wells.
BC
I would remove the intake, inspect the sensors, the connectors on the sensors, the wiring and harness connector at the back of the block. Also make sure that the sensor wells are clean and dry inside
Make sure you use RTV sealant and seal the knock sensor rubber covers to the plate to help keep water out of the sensor wells.
BC
Tech Contributor
Joined: Jan 2007
Posts: 19,512
Likes: 1,186
From: Dyer, IN
Did you unplug the KNOCK SENSOR Connector or damage the Knock sensor wires during the intake manifold reinstallation?
I would remove the intake, inspect the sensors, the connectors on the sensors, the wiring and harness connector at the back of the block. Also make sure that the sensor wells are clean and dry inside
Make sure you use RTV sealant and seal the knock sensor rubber covers to the plate to help keep water out of the sensor wells.
BC
I would remove the intake, inspect the sensors, the connectors on the sensors, the wiring and harness connector at the back of the block. Also make sure that the sensor wells are clean and dry inside
Make sure you use RTV sealant and seal the knock sensor rubber covers to the plate to help keep water out of the sensor wells.
BC
You can see if the knock sensor harness is plugged in or not(located by the left rear top of motor. If it's plugged in, you may have damaged/pinched the harness under the intake.
Thread Starter
Instructor
Joined: May 2001
Posts: 127
Likes: 1
From: Yorba Linda, CA,,,USA
I removed the intake again (I’m getting good at it) and found that the wires for the knock sensors were pinched, burned, and broken. I’m sure that reseating the manifold pinched the wires, but it looks like this has been in the works for a while. There’s not much clearance between the manifold and the plate that covers the valley. The wires barely fit (I could see the imprint from the wires in the foam under the manifold). I soldered and spliced in some new wire. I’ll see if that holds.
Burning Brakes
Joined: Jul 2004
Posts: 1,172
Likes: 71
From: MA
The harness isn't that expensive. When I did mine I replaced the harness all the way to the connection behind the block. It is cheap insurance. Wires get brittle over time and I found that the rubber plugs shrunk and were hard as nails.
Also, you should consider a oil pressure switch relocation kit. Why do you want to go do that again? These things fail frequently.
Also, you should consider a oil pressure switch relocation kit. Why do you want to go do that again? These things fail frequently.
Thread Starter
Instructor
Joined: May 2001
Posts: 127
Likes: 1
From: Yorba Linda, CA,,,USA
01Vetter...Does the harness go all the way to the knock sensors under the rubber covers? I didn't remove these. I thought it looked like one piece and I would have to replace the sensors as well. Also I replaced the oil pressure sensor with a sensor from NAPA. It's an Echlin, and it says made in the USA. Hopefully it will last. If not, I will consider the sensor relocation.
Last edited by Jamn; Jul 4, 2009 at 12:47 PM.
Burning Brakes
Joined: Jul 2004
Posts: 1,172
Likes: 71
From: MA
The harness includes the connectors to the knock sensors, the rubber plugs that seal the knock sensor wells, and all the wiring with plug that connects to the harness at the rear of the block. It is all one piece. If you go to a GM dealer be careful because they tried to sell me just the wire that I would have had to solder to the existing harness. I found that my rubber plugs were deteriorated to the point that they leaked. Also, my rear knock sensor well seal in the valley cover let go and as such, I had a pool of oil around my rear knock sensor.
I got the harness, knock sensors and intake gaskets from Gene Culley at GM parts house (http://www.gmpartshouse.com/)
I got the harness, knock sensors and intake gaskets from Gene Culley at GM parts house (http://www.gmpartshouse.com/)
Tech Contributor
Joined: Jan 2007
Posts: 19,512
Likes: 1,186
From: Dyer, IN
The harness includes the connectors to the knock sensors, the rubber plugs that seal the knock sensor wells, and all the wiring with plug that connects to the harness at the rear of the block. It is all one piece. If you go to a GM dealer be careful because they tried to sell me just the wire that I would have had to solder to the existing harness. I found that my rubber plugs were deteriorated to the point that they leaked. Also, my rear knock sensor well seal in the valley cover let go and as such, I had a pool of oil around my rear knock sensor.
I got the harness, knock sensors and intake gaskets from Gene Culley at GM parts house (http://www.gmpartshouse.com/)
I got the harness, knock sensors and intake gaskets from Gene Culley at GM parts house (http://www.gmpartshouse.com/)
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Burning Brakes
Joined: Jul 2004
Posts: 1,172
Likes: 71
From: MA
I did the SB as well, including removing the foam seal from the rear of the intake manifold. For those that haven't done this yet, the SB says not to form a complete circle of RTV around the rear knock sensor. It advises leaving a section on the rear without RTV for drainage.
The new rubber plugs fit much snugger than the old ones. I also used some RTV around these to get a better seal.
The new rubber plugs fit much snugger than the old ones. I also used some RTV around these to get a better seal.
