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Knock Sensor readings
- Thread starter Scott13SHO
- Start date
FoMoCoSHO said:Yeah, she got hot but recovered quickly.
I was shocked that I had no knock.
Maybe the ecu becomes a tad conservative under those condition and just doesn't get to that point.
It's possible, even being tied to ambient temps.
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I think I finally have a definite answer for my random occasional KR spikes and it's not tune related, and it's not octane related either! On a recent short (6 hrs.) trip I was able to finally tie my KR spikes to a driving situation not just once but twice. It is triggered by a tranny malfunction that I have been dealing with for years. The tranny "slip/bang" occurrences used to be real bad but the valve body TSB made it about 90% better and Ford won't fix the suspect sensors that I'm blaming for the remaining problem because it's not readily reproducible. I've been living with the occasional symptoms for a long time. I'm not sure why the tranny screw up causes a momentary high KR reading but now that I know it does, I can just ignore the reading and reset the KR gauge. For the last couple of months I have been running everything from stock to LME 4+ 3BAR and monitoring my readings. A few days ago I finally reloaded my 4X tune and oh my how sweet it is. It's great to have my eco-beast back!
SHOdded said:A good reminder to consider all inputs into this complex electromechanical system ...
that's a no shi**er !
BiGMaC said:Larry.... The tranny detective work is awesome! The question I have about the KR is related to the sensor, which as you probably know, is just a microphone. Do you think the tranny sends vibration or frank noise that the sensor/ECM interpret as Knock?
Wish I knew BigMac. In lieu of hard facts I'm making guesses that seem at least to make sense to me. The ECM is very sophisticated and maybe more than the sound of pinging would go into the decision to throw a high KR. Maybe it's considering the interplay of sounds, temps, timing, load, and maybe even gear selection to actually prevent detonation. If gear selection is going screwy as in my case, a tranny sensor error might cause a calculation/value that would command the car to go into a protective mode. Maybe a good way for the car to pull timing is to throw out a high KR number. Always dangerous to be building a case for what and how based on so much assumption. Wish I knew more and was guessing less!
I had some pretty bad wheel hop one night and threw a positive 6.5.Larrylu said:BiGMaC said:Larry.... The tranny detective work is awesome! The question I have about the KR is related to the sensor, which as you probably know, is just a microphone. Do you think the tranny sends vibration or frank noise that the sensor/ECM interpret as Knock?
Wish I knew BigMac. In lieu of hard facts I'm making guesses that seem at least to make sense to me. The ECM is very sophisticated and maybe more than the sound of pinging would go into the decision to throw a high KR. Maybe it's considering the interplay of sounds, temps, timing, load, and maybe even gear selection to actually prevent detonation. If gear selection is going screwy as in my case, a tranny sensor error might cause a calculation/value that would command the car to go into a protective mode. Maybe a good way for the car to pull timing is to throw out a high KR number. Always dangerous to be building a case for what and how based on so much assumption. Wish I knew more and was guessing less!
Hasn't happened since probably because a little torque management was added back in....
ecoboostsho
New member
I know on my Grand Prix shifting could cause false knock. You could up the octane and it wouldn't go away (or if it did then it was real). I don't see this on my SHO though. When my knock gauge is reading numbers I usually believe it. That said I still only get appreciable knock at part throttle up a hill - almost never at WOT.
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Yea... I get that, kinda does the same thing on easy acceleration... Lugs easy. Makes me use the throttle briskly and then let go...ecoboostsho said:I know on my Grand Prix shifting could cause false knock. You could up the octane and it wouldn't go away (or if it did then it was real). I don't see this on my SHO though. When my knock gauge is reading numbers I usually believe it. That said I still only get appreciable knock at part throttle up a hill - almost never at WOT.
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