Knock sensor?
Thread Starter
Racer
Joined: Jan 2012
Posts: 405
Likes: 0
From: northern ca
St. Jude Donor '14
Knock sensor?
I have a rough idea how the knock sensing system work but do they fail? My 04 coupe (no mods) seems to have a knock once in a while. I usually do keep high test in it but have heard a ping/knock under some situtions and at full load. No codes or Engine service light 
thx in advance for the help.
thx in advance for the help.
Melting Slicks
Joined: Jul 2012
Posts: 2,507
Likes: 9
They do fail and they do throw codes when they do, are you checking codes with the DIC or a handheld scanner?
They generally fails by water infiltration from the top (people washing their engine with water) or from below with oil (there are plastic caps in the bottom of the wells the sensors sit it and they leak).
They generally fails by water infiltration from the top (people washing their engine with water) or from below with oil (there are plastic caps in the bottom of the wells the sensors sit it and they leak).
Thread Starter
Racer
Joined: Jan 2012
Posts: 405
Likes: 0
From: northern ca
St. Jude Donor '14
They do fail and they do throw codes when they do, are you checking codes with the DIC or a handheld scanner?
They generally fails by water infiltration from the top (people washing their engine with water) or from below with oil (there are plastic caps in the bottom of the wells the sensors sit it and they leak).
They generally fails by water infiltration from the top (people washing their engine with water) or from below with oil (there are plastic caps in the bottom of the wells the sensors sit it and they leak).
With the DIC, I'll give the scanner a try when I get a chance but wouldn't that give a check engine light? thx
Melting Slicks
Joined: Jul 2012
Posts: 2,507
Likes: 9
DIC is fine for this but a decent scanner will allow you to graph the output of the knock sensors and to capture them . The CEL would trigger if the sensor(s) were BAD, your's are most likely OK and the system may not be able to adjust the timing enough to compensate for bad fuel or excessive carbon buildup.
