Fresh engine swap-P0327
Thread Starter
Teching In
Joined: Sep 2019
Posts: 46
Likes: 5
Fresh engine swap-P0327 Hey guys, I have a fresh LQ4 swap into my Camaro but now I am getting the P0327 code for Knock Sensor low voltage. I replaced both knock sensors when the engine was out. Is there a good way to troubleshoot what the issue could be? If I erase the code, is it safe to drive and see if it comes back?
Thanks in advance
Thanks in advance
TECH Fanatic
Joined: Dec 2017
Posts: 1,467
Likes: 265
From: Bossier City, Louisiana
Hello,
Sure, go ahead and drive it after clearing the fault. Make it a short trip. Are you running anything risky in your engine that would cause knock? High compression, lots of spark advance, forced induction or nitrous?
Rick
Sure, go ahead and drive it after clearing the fault. Make it a short trip. Are you running anything risky in your engine that would cause knock? High compression, lots of spark advance, forced induction or nitrous?
Rick
Thread Starter
Teching In
Joined: Sep 2019
Posts: 46
Likes: 5
9.5:1 compression, no forced induction or nitrous. I am not sure of the exact spark advance because it was professionally tuned at a shop.
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
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From: Central Cal.
This hasn't been mentioned, so I will.
Check that all grounds are good.
Check for any bent/missing pins, and that all are connecting solid.
It all seems obvious, but you would be surprised at what gets missed or overlooked.
Check that all grounds are good.
Check for any bent/missing pins, and that all are connecting solid.
It all seems obvious, but you would be surprised at what gets missed or overlooked.
TECH Fanatic
Joined: Dec 2017
Posts: 1,467
Likes: 265
From: Bossier City, Louisiana
Good call on changing the knock sensor harness. The connectors on my old knock sensor harness crumbled in my hands when I replaced my sensors. Its a harsh environment at that location.
Rick
Rick
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Verdad Gallardo TECH Fanatic
Joined: Dec 2017
Posts: 1,467
Likes: 265
From: Bossier City, Louisiana
The things pointed out in post #2 above are the typical causes of knock with the possible addition of a carbon hot spot in the combustion chamber and low octane fuel. That P0327 code is merely telling you that you likely lack knock detection.
Rick
Rick