If this doesn't fix it I give up
10-03-2009, 07:27 PM
#28
Maybe its not "false knock". Now I don't know a whole lot about the subject, so feel free to snipe anything I say as potential causes, I am just thinking out loud. I do know that the knock sensors use what's called a Piezo Electric crystal, and when disturbed in any way above its established parameters, generates a small amount of voltage. Voltage increase is proportionate to intensity of the disturbance (vibration, knock, hitting the block with a hammer, motor torquing and exhaust making contact, etc...
1. Is it possible that one of the injectors is partially clogged, causing that cylinder to go lean and not have the same intensity during combustion?
2. Exhaust tubing making contact with chassis under WOT? This can be a royal PITA to find, I spent weeks under my TA chasing this issue.
3. Heavy carbon buildup in CC, on valves, or piston face, superheating and causing detonation?
4. Valve float (not very common anymore, but still possible.
5. Broken or sagging motor mount(s)?
1. Is it possible that one of the injectors is partially clogged, causing that cylinder to go lean and not have the same intensity during combustion?
2. Exhaust tubing making contact with chassis under WOT? This can be a royal PITA to find, I spent weeks under my TA chasing this issue.
3. Heavy carbon buildup in CC, on valves, or piston face, superheating and causing detonation?
4. Valve float (not very common anymore, but still possible.
5. Broken or sagging motor mount(s)?