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View Full Version : LS1 Knock Problem

BigAls87Z28
02-08-2011, 10:25 PM
Friend of mine called me today and asked me if there is a common problem with knock sensors. He has replaced 3-4 of them so far, as well as the small harness, and is still getting the code. Anything common with this?
I told him to check his mounts to see if anything is hitting, but everything is ok. His exhaust does hit the panhard location bracket, but not sure if that is going to effect the knock sensor in the block?
SRGN
02-08-2011, 10:38 PM
Exhaust hitting can trip the knock sensors. Why did he change the sensors? Codes or just reading a lot of knock retard?
Stevoone
02-09-2011, 12:35 PM
I'm not big into LS1's but I remember seeing a service bulletin for knock sensors. I'll look around and see if I can find it.


02-06-04-023A is the bulletin I was thinking about. Not sure if that will help at all since he's already replaced the sensor and the harness. I'd fix the exhaust first before you tear the intake back off.
NJ346
02-09-2011, 02:12 PM
Friend of mine called me today and asked me if there is a common problem with knock sensors. He has replaced 3-4 of them so far, as well as the small harness, and is still getting the code. Anything common with this?
I told him to check his mounts to see if anything is hitting, but everything is ok. His exhaust does hit the panhard location bracket, but not sure if that is going to effect the knock sensor in the block?

I know I had a problem with mine a while back in my old motor. Has he tried replacing both of them at the same time?
KirkEvil
02-09-2011, 03:10 PM
Does he have any mods on the car? Underdrive pulley or aftermarket torque converter can set off knock codes....
BigAls87Z28
02-12-2011, 12:21 AM
No mods really, just flowmaster cat back and a lid I believe.
Both sensors were replaced, as was the harness. Keeps tripping the same codes. He replaced the sensors, it goes away. then a week or so later, it pops a code again. Replaced both again, fine for a while then it comes back. Replaced it again with harness. No problem...for a few weeks.
BonzoHansen
02-12-2011, 10:15 AM
what are the codes?
creeper
02-12-2011, 10:42 PM
I've actually heard of a few people having this problem and never finding a fix

I've been throwing a knock code for 6 months, I think I yanked the harness too hard when I did my 6 speed swap so I've had the new sensors and harness staring at me for months waiting to go in