You didn't say what year or what engine.
Assuming it is a 99-06 4.8, 5.3, or 6.0 the knock sensors are under the intake manifold. Search for a write up about replacing them and sealing the boots.
On the ABS module you can replace just the circuit part. Check ebay for the part and peole that will fix yours.
Last edited by PitchBlackC3; 10-11-2010 at 12:46 PM.
crap sorry it is a silverado, 4.8, 2001
Work in progress.........
You'll need to Disconnect intake tubes, all wiring to intake and coils, pull the wiring harness back and disconnect any emissions hoses. Disconnect the fuel lines,(be sure to put a shop rag or something under the connections to catch the fuel that will most definitely leak out). Unbolt the intake manifold and remove it with rails injectors and everything still attached. The get some tape and cover all the intake ports to keep them free of debris. After that, if you have steam vent tubes running across the top of the valley cover you'll need to remove them. After that, pop the rubber plugs out of the two holes in the valley cover and carfully disconnect the electrical plugs attached to the knock sensors by squeezing them at their widest point and lifting up, don't pull on the wires though, just the connector. After that, unbolt the valley cover and carefully remove the cover. After that, replace the knock sensor and replace the cover. Be sure to follow the resealing procedure for the rubber boots that seal the knock sensor holes. After that, reinstall everything in reverse.
I hope this helps, I probably missed a lot. Anybody else, feel free to chime in.
Last edited by molitor; 10-12-2010 at 10:10 PM. Reason: eh?
[IMG]https://images.app.goo.gl/XLfskemekXBo5VfS7/IMG]
www.tjc.edu
You don't have to take off the valley cover or the steam tubes even on the ones that have them. Just take out the sensors and clean the holes.
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