FD3S Knock Sensor

kariayam · 01-25-2011, 09:01 AM

Hi Guys,

Just need some opinion from you guys regarding my knock sensor...

Normally, I'll read maximum knock value less 24-27 and hardly hit 30 thru Power FC commander. However, I've been seeing higher value of 47 to 55 lately.

Upon investigation,the rubber insulator that suppose covering the sensor outer surface was found melted letting the sensor naked.

Could this condition makes the sensor picking up false knock value ? any of u guys had experienced the same matter?

However I'll try to put sillicone rubber sealant and see how it could improve the knock readings.

Amer

vex · 01-25-2011, 10:25 AM

Since a knock sensor is basically a microphone any deadening material removal will result in higher false positives.

djmtsu · 01-25-2011, 10:39 AM

I'm with vex. I had a similar issue with a knock sensor on my Outback. The rubber was in bad shape, and the ECU was getting high knock readings. Swapped in a new one and everything went back to normal.

kariayam · 01-27-2011, 12:08 AM

Thanks for the reply guys..

Just had the sensor filled in with high temp silicone rubber glue.

Will wait till the rubber dries and see how it goes....

01-25-2011, 09:01 AM	#1
kariayam The Newbie Join Date: Sep 2010 Location: malaysia Posts: 5 Rep Power: 0	FD3S Knock Sensor Hi Guys, Just need some opinion from you guys regarding my knock sensor... Normally, I'll read maximum knock value less 24-27 and hardly hit 30 thru Power FC commander. However, I've been seeing higher value of 47 to 55 lately. Upon investigation,the rubber insulator that suppose covering the sensor outer surface was found melted letting the sensor naked. Could this condition makes the sensor picking up false knock value ? any of u guys had experienced the same matter? However I'll try to put sillicone rubber sealant and see how it could improve the knock readings. Amer

01-25-2011, 10:25 AM	#2
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. Posts: 2,113 Rep Power: 20	Since a knock sensor is basically a microphone any deadening material removal will result in higher false positives. __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group

01-25-2011, 10:39 AM	#3
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	I'm with vex. I had a similar issue with a knock sensor on my Outback. The rubber was in bad shape, and the ECU was getting high knock readings. Swapped in a new one and everything went back to normal. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

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01-27-2011, 12:08 AM	#4
kariayam The Newbie Join Date: Sep 2010 Location: malaysia Posts: 5 Rep Power: 0	Thanks for the reply guys.. Just had the sensor filled in with high temp silicone rubber glue. Will wait till the rubber dries and see how it goes....