What Causes Engine Knock?
There are multiple reasons engine knock could occur. Here are a few potential causes:

Poor timing: the spark is not igniting at the correct time.
Improper air and fuel mixture: if the ratio of air to fuel is incorrect, this could create ignition problems.
Deposits inside the cylinder: dirt, grime, and contaminants can enter cylinders and create all sorts of issues.
Faulty, unhealthy, or incorrect spark plugs: the wrong type of spark plug, spark plugs with deposit build up, or incorrect spark plug gaps could cause poor spark or incorrectly timed spark.

What Does Engine Knock Sound Like?
Engine knock typically sounds like a knock, or click coming from the engine. The sound often becomes more noticeable during throttle input and/or acceleration.

Process of changing knock sensors (Test your sensors before installing):
1. Remove the rear piece of foam from the intake manifold
2. Check and clean 2 grounds at the rear of the engine while the manifold is off
3. Clean the gunk out of each knock sensor hole
4. Make little horseshoes of silicone with an opening facing the rear of the engine around each sensor port to direct water away. Horshoes, not circles
5. Replace the wire harness
6. Add silicone to new rubber harness boots when installing
7. Torque knock sensors to suiable ftlb

Package Included:
2 x Knock sensors (usually only the rear gets broken but since this is a large job you might as well swap them both)

Warm Tips:
If you buy a wrong type for your vehicle, please not damage the label and barcode return it in the native package. If you have installed, please clean it and put into the resellable original package, otherwise may not accept your returns.
The brands related above are only for purposes of demonstrating compatibility, not use as trademarks, our trademark is Meonum.