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It's a simple job, it does require the removal of the intake manifold as the knock sensors are mounted under it. I'm posting a link to a video that explains it well, be sure to use top quality intake gaskets when reassembling your Suburban's Engine. No big deal,6yuve got this, ask more questions if you need more answers!
Install the knock sensor.Tighten Tighten the knock sensor to 25 [n-m] (18 lb ft).
Connect the knock sensor electrical connector.
Reinstall the intake manifold. this is quite a job and i would not reccomend a novice mechanic to preform this repair book time is about two hours for this repair hope this helps
It is somewhat complicated to change the knock sensors. There are two of them and they are located under the intake manifold. The intake manifold must be removed. I would recommend tha you replace both while you have the engine apart.
What leads you to believe the knock sensors are bad, I've seen few bad knock sensors? The knock sensor issues more times than not have been caused by other problems.
After you remove the intake manifold disconnect the knock sensor connectors. Remove the bolts and the two knock sensors then replace with new knock sensors tighten the bolts to 15 foot pounds. Reinstall manifold. The total job for an experienced mechanic with tools is about 5 hours. Not a good job for a beginner.
This is a big job, you will need to remove the intake manifold and various other intake components to get to the knock sensor, which is sitting in the V gulley of the engine.
But basically you need to remove all inlet tract components, and the top cooling system components, then remove inlet manifold and there you will see the knock sensor.
Hi welcom to fixya.
A defective knock sensor may cause engine detonation or reduced spark advance and fuel economy. When a knock sensor is removed and replaced, the sensor must be tightened to its specified torque. If the knock sensor is installed tighter than it should be, it may become too sensitive and provide an excessively high voltage signal, resulting in more spark ****** than required. When the knock sensor is installed looser than it should be, the knock sensor signal will be lower than normal, resulting in engine detonation.
To replace the knock sensor:
Disconnect the knock sensor wiring connector.
Then, unscrew the sensor.
Remove the knock sensor.
Reverse the procedures to install the part.
15 ft.lbs.torque
hope this helps.Thank You for using fixya..iluv2fish.. Ray..
the knock sensors are located under intake there is two so best to replace both while you have tore down. what usually happens is moisture builds up and causes bad connection. to remove intake remove fuel lines after bleeding pressure!!! all obvious hoses and wiring and i think it is 10 bolts holding intake down. let me know if you need more help
It's located deep in the valley! Under the "LOWER intake manifold". copy and paste this link in your browser, or try clicking on it. It may be helpful to you.
I didn't find this link until after I had already disassembled my truck. This is the hardest job that I've taken on thus far, hope I can put it all back together properly. I changed the gaskets on the valve covers since I had everything off. To answer your question: It's under your lower intake manifold, so it's a hard job!
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