Knock Sensor: How to tell a good one?
12-18-2007, 09:04 PM
#1
Knock Sensor: How to tell a good one? Hey guys, I have been throwing a P0327 Code since I bought this freakin car, and I've finally gotten into troubleshooting it, after realizing, oh hey, I'm losing a lot of timing.
The car is pulling a constant 4 degrees at ANYTHING over 60% throttle, which means lean VE tables and all that crap.
I dug in and popped off the intake (snapped the oil pressure unit too!) with a friend, and the knock sensor's sure look rusted out.
I got a pair of new ones from a buddy that had some, and he claims one of them is bunk.
I can't figure out how to tell which is which. The nominal resistance is 93-107kohms, and I got one at 99.3 and one at 100.3.
I guess the proper way is to hook em up?
Anyone got a good idea? I'm going with this site as a bit of a guide, just curious about practical applications...
http://gearchatter.com/viewtopic8730...63ae227dd2ce24
The car is pulling a constant 4 degrees at ANYTHING over 60% throttle, which means lean VE tables and all that crap.
I dug in and popped off the intake (snapped the oil pressure unit too!) with a friend, and the knock sensor's sure look rusted out.
I got a pair of new ones from a buddy that had some, and he claims one of them is bunk.
I can't figure out how to tell which is which. The nominal resistance is 93-107kohms, and I got one at 99.3 and one at 100.3.
I guess the proper way is to hook em up?
Anyone got a good idea? I'm going with this site as a bit of a guide, just curious about practical applications...
http://gearchatter.com/viewtopic8730...63ae227dd2ce24
12-18-2007, 11:15 PM
#2
That looks like a great guide for for OBDII systems.
You didn't say whether you're working on OBDI or II.
I don't know enough about Firebirds to tell what year you have, but if you're working on OBDI, try http://shbox.com/1/4th_gen_tech2.html#knock_sensor
There's also pertinent information for OBDII, but that other site looked even better.
You didn't say whether you're working on OBDI or II.
I don't know enough about Firebirds to tell what year you have, but if you're working on OBDI, try http://shbox.com/1/4th_gen_tech2.html#knock_sensor
There's also pertinent information for OBDII, but that other site looked even better.
12-18-2007, 11:19 PM
#3
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Yeah, proper way would be to hook them up, snap the intake back on and clear the codes ....check to see if they come back up again after some drive time. That would be what I've done anyways,...knock sensors have been a consistent pain in the *** for me also, just replaced a set in the Z28 today.
12-19-2007, 12:29 AM
#4
Yeah, proper way would be to hook them up, snap the intake back on and clear the codes ....check to see if they come back up again after some drive time. That would be what I've done anyways,...knock sensors have been a consistent pain in the *** for me also, just replaced a set in the Z28 today.
argh. I do NOT wanna mess with replacing the intake 30 times.
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12-25-2007, 11:26 PM
#10
Damn I just did mine two weeks ago. I had a P0327 code I reset it with a cheap code reader and it was fine, but I had to hook up hptuners to be sure, and it had the same code pending. Before I pulled the intake I ohmed them out. The front said 33k ohms which explained the P0327 (front KS).
I ordered two GM sensors, wire harness, and intake gaskets. Also sealed the rubber plugs with silicone as instructed in a TSB GM put out, this will keep water from getting in again.
I ordered two GM sensors, wire harness, and intake gaskets. Also sealed the rubber plugs with silicone as instructed in a TSB GM put out, this will keep water from getting in again.
12-26-2007, 11:52 AM
#11
Damn I just did mine two weeks ago. I had a P0327 code I reset it with a cheap code reader and it was fine, but I had to hook up hptuners to be sure, and it had the same code pending. Before I pulled the intake I ohmed them out. The front said 33k ohms which explained the P0327 (front KS).
I ordered two GM sensors, wire harness, and intake gaskets. Also sealed the rubber plugs with silicone as instructed in a TSB GM put out, this will keep water from getting in again.
I ordered two GM sensors, wire harness, and intake gaskets. Also sealed the rubber plugs with silicone as instructed in a TSB GM put out, this will keep water from getting in again.
Just did this too, my front sensor was a pile of rust. Cutting EGR plates this afternoon to finish it up.
12-26-2007, 12:23 PM
#12
Just did 'em on a friends 5.3 in his silverado-took me about and hour and a half to swap em out, both were swimming in a mud/water/rust stew, and another friend that followed him when he was "fording the river" has codes for the same issue, at least i get free beer out of the deal...
01-01-2008, 09:41 AM
#16
Then I checked with hptuners and it had a code pending.
This link will tell you what sets the dtc.
http://www.gearchatter.com/viewtopic9363.php
01-04-2008, 12:41 AM
#17
No it won't. I had a dead one, reset the code and the light stayed off for several driving cycles.
Then I checked with hptuners and it had a code pending.
This link will tell you what sets the dtc.
http://www.gearchatter.com/viewtopic9363.php
Then I checked with hptuners and it had a code pending.
This link will tell you what sets the dtc.
http://www.gearchatter.com/viewtopic9363.php
Good to know.
