Results 11 to 16 of 16
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05-06-2019, 07:09 PM #11
Interesting, a knock like that would probably be heard by the engine knock sensors and kill power too.
There has to be a better fix.
Sent from my iPhone using Tapatalk2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan
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05-06-2019, 09:03 PM #12
No..no...“Knock sensors” detect detonation which is a specific frequency. It will detect this frequency for a period of time and then reduce timing until it stops. As a FYI a internal combustion engine is most efficient and produces the most power right on the edge of knocking/detonation.
I wouldn’t call this a knock, I would call it a “tap”....metal tapping together...it’s something in the engine bay, NOT in the engine.
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05-06-2019, 09:38 PM #13
Knocking noise at idle 2015 Mondo
2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan
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05-06-2019, 09:56 PM #14
You’re right in that a sensor is like a microphone...however an engine and drivetrain will make all sorts of noise...knock sensors are designed to detect detonation frequency- not random tapping or other knocking type noises... For example, if you were to tap on the engine with a screw driver it’s not going to start retarding timing..
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05-06-2019, 10:09 PM #15
When you hook up hptuners you can see timing be pulled if the sensors hear anything that resembles knock.
I will admit I am not familiar with Ford , But GM sensors pull timing with sources of false knock, including tapping with a screw driver.
I wish the indmar ECM allowed use of HP tuners.
Sent from my iPhone using Tapatalk2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan
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05-14-2019, 03:00 PM #16
My 16 mojo had a random knock that bothered me for the first season. Finally found out it was the plastic board that the ballast pumps are mounted too. Wedged a towel between it and the transom. Problem solved. Hope yours is an easy fix too.
Sent from my iPhone using Tapatalk2016 Mojo