Knock sensors
- Thread starter 992dr
- Start date
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Deleting the cats will do that
After changing them Sunday, the light stayed on for one day then cleared again. It has not come back on since.
I'll have to look around and see if there is a nick or cut somewhere. I'm all about preventative maintenance hah.
I haven't done my exhaust yet. It's all stock.
Matthew Jeschke
Full Access Member
I have same problem but brought on by my own stupidity. I hate to invest too much in this 5.3 motor as I plan to build a 6.0 just haven't found the block yet. I power washed behind my water pump when I replaced it. Then put everything back together. I think some of the water got under the intake and into the knock sensor (my guess). Now I'm throwing P0332 code 
I'm not sure if P0332 indicates I wrecked one or both of the knock sensors under the intake. And if I can get by with one bad knock sensor. Truck runs fine otherwise.
I'm not sure if P0332 indicates I wrecked one or both of the knock sensors under the intake. And if I can get by with one bad knock sensor. Truck runs fine otherwise.
Matthew Jeschke
Full Access Member
I'm going to save a few notes in here in case anybody else comes across this thread.
P0327 - Front knock sensor closest throttle body
P0332 - Rear knock sensor closets bell housing
Nominal sensor has 93k to 107k Ohms resistance (can test through connector to chassis ground / engine block).
Nominal output is AC 400mV. Tap on engine block with wrench and see if you get signal on DMM.
Wiring harness copied below:
P0327 - Front knock sensor closest throttle body
P0332 - Rear knock sensor closets bell housing
Nominal sensor has 93k to 107k Ohms resistance (can test through connector to chassis ground / engine block).
Nominal output is AC 400mV. Tap on engine block with wrench and see if you get signal on DMM.
Wiring harness copied below:
Last edited:
I have same problem but brought on by my own stupidity. I hate to invest too much in this 5.3 motor as I plan to build a 6.0 just haven't found the block yet. I power washed behind my water pump when I replaced it. Then put everything back together. I think some of the water got under the intake and into the knock sensor (my guess). Now I'm throwing P0332 code
I'm not sure if P0332 indicates I wrecked one or both of the knock sensors under the intake. And if I can get by with one bad knock sensor. Truck runs fine otherwise.
Gen IV knock sensors are not under the intake, they are located on the bottom sides of the block.
iamdub
Full Access Member
I have same problem but brought on by my own stupidity. I hate to invest too much in this 5.3 motor as I plan to build a 6.0 just haven't found the block yet. I power washed behind my water pump when I replaced it. Then put everything back together. I think some of the water got under the intake and into the knock sensor (my guess). Now I'm throwing P0332 code
I'm not sure if P0332 indicates I wrecked one or both of the knock sensors under the intake. And if I can get by with one bad knock sensor. Truck runs fine otherwise.
Just replace both as well as the harness since you'll already have the manifold off. When you build the 6.0, swap the sensors and harness over to it. Be sure to blow and vacuum out the holes before you remove the sensor(s) so no debris falls in. Apply a moderate layer of RTV to the underside of the flaps on the harness so they seal to the valley cover and keep water out.
Matthew Jeschke
Full Access Member
Ah I didn't realize your post was for gen 4... I have a gen 3.
Sent from my SM-A505U using Tapatalk
, I'd do exactly what iamdub suggested
Matthew Jeschke
Full Access Member
Tore it down, fun project... I'm a glutton for punishment haha Just don't like the $50 I'm spending on a motor I plan to get rid of. Got two new knock sensors, harness, and intake gasket. I must say, this Gen 3 design is BAD, at least they could have made a better seal for the sensor / harness. It was laughable. Certainly had been water accumulating in there for a long time. It looked like I raised a cannon from a sunken ship haha. I measured resistance and was basically an open. The second sensor looks great. The harness still made a connection but has a bunch of resistance in it so needs junked. Thanks everybody for the help. I'll probably RTV the seal in as I've seen other people do when I put it back together.
