Knock sensor riddle
Thread Starter
Staging Lane
Joined: Nov 2011
Posts: 51
Likes: 0
From: Fredericksburg,va
Knock sensor riddle Ok guys I got a good one Ive seen 100's of forums on this put no fix I have a 99 GMC rcsb 5.3 bored to 5.7 PRC CNC heads vinchi trucker high lift cam long tube etc not gona list everything I have both knock sensor codes po327 and po332 I've replaced the sensors and harness 4 times torqued to spec it keeps coming up and pulling time we even cleared the code long enough to tune it and they always come bak but they ohm out right at 99ohms all the way through the sensor harness im lost I got alot of experience with these engines and I've never seen this I duno what to do the engine purs like a kitten there is no knock give me your opinions ? I tryed to find a diagram of the whole circuit but I can't find one I don't think it's a PCM issue caise that's the only issue with the truck?
TECH Addict
Joined: Aug 2005
Posts: 2,305
Likes: 126
From: Monroe,NY
Did you use all genuine gm parts? I only ask because i have read many times with knock sensor problem are with the after market sensors and aftermarket harness. Once the put the proper gm parts in they worked fine. Also make sure none of the wires are pinched anywhere.
