Knock Sensor
Thread Starter
Teching In
Joined: Feb 2021
Posts: 6
Likes: 0
Knock Sensor Hey everyone. I have a 2000 Trans Am with 117k. Car was throwing p0405, p0122, p01404 and p02635 when I took it to the Kniesels Auto. They did find some wiring issues caused by a bracket on back of motor rubbing thru harness. In order to fix the wiring issues they found they needed to remove the intake manifold. It was suggested while we had the intake manifold off to replace send knock sensors and the knock sensor harness. Since that work was done none of the codes listed above have returned but I now have a p0322 code. After some back-and-forth they decided to replace again with new knock sensors and put a new wiring harness as well. I am now throwing a p0327 code. Does anyone have any thoughts of what may be causing my car to throw these codes? Could it be some more wiring issues within the main harness? Could it being caused by something internally within the motor? I love the car but I don't want to keep throwing money at it if I don't know what the actual issue is any thoughts would be very much appreciated
Thread Starter
Teching In
Joined: Feb 2021
Posts: 6
Likes: 0
New wiring So I bought a new pigtail for knock sensor, harness side. Ran new wiring from pcm to knock harness with new pigtail so basically direct in the event there was an issue in the main harness. Drove around for a few days checking for codes after runs with no codes. Went out today and ran the car much harder. I was cruising on freeway at 80-90 for a 20 mile run and when I got home it had same code as before. P0327. Guess I start with vacuum lines and injectors next if it's just a air/fuel mixture. Thoughts
Knock sensor may not be getting the voltage needed which could be due to connectivity issues. As pdxmotorhead suggested make sure you have good cleaned grounds and I hope you're using the ACDelco knock sensors.
Thread Starter
Teching In
Joined: Feb 2021
Posts: 6
Likes: 0
Knock Sensor Yep AC delco sensors and harness done twice. Not sure what grounds as its essentially wired direct from knock harness to pcm. I guess the pcm must have a ground, there are 16 grounds I have read. I haven't checked at the back of cylinder heads. Gonna check vacuum lines then move on to o2 sensor and maybe injectors
