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Pelican Technical Article:

Replacing Your Engines Knock Sensors

Steve Vernon

Time:

2 hours2 hrs

Tab:

$35 to $70

Talent:

****

Tools:

13mm wrench or socket. Torque wrench

Applicable Models:

VW Golf GTI (2000)

Parts Required:

New knock sensors sensor, intake manifold gasket

Hot Tip:

Don't work on a hot engine

Performance Gain:

Piece of mind on engine knock

Complementary Modification:

New injectors

There are two knock sensors on the GTI Mark4 and they play an important part of the engine management system. The sensors detect knock or ping in the motor which is pre detonation and can cause serious and expensive damage to the motor. If knock is detected the sensor will tell the management system of the engine to severely retard the ignition. Beside an error code you will notice a lack of power and throttle response, especially when on boost.

The sensors are easy to replace once you get access to them. Unfortunately you will need to remove the fuel rail, injectors and intake manifold. Please see our articles on how to perform this work. While some people have claimed to change them without removing the intake system I do not see how that would be possible.

Note: The knock sensors are torque sensitive and over or under torquing them will result in incorrect readings from the sensors and poor performance from the motor. The bolts must be torqued to 15 lbs.

The sensors are located on the front of the motor under the number 1 and 2 and the number 3 and 4 intake runners.

With the intake system off you can see both sensors mounted to the engine block. Remove the electrical connections.

You can easily remove the 13mm bolt with a wrench but you will need to reattach the new sensor with a torque wrench as the torque of the bolt is integral to the function of the sensor.

Installation is the reverse of removal.

The sensors are located on the front of the motor under the number 1 and 2 and the number 3 and 4 intake runners (red arrows).
Figure 1

The sensors are located on the front of the motor under the number 1 and 2 and the number 3 and 4 intake runners (red arrows).

With the intake system off you can see both sensors mounted to the engine block.
Figure 2

With the intake system off you can see both sensors mounted to the engine block. The left sensor (yellow arrow) still has the electrical connection attached while the right side (red arrow) has been removed. Note: you do NOT need to disassemble the engine to this point to preform this work! This photo was used only to illustrate the location of the sensors

You can easily remove the 13mm bolt with a wrench (red arrow) but you will need to reattach the new sensor with a torque wrench as the torque of the bolt is integral to the function of the sensor.
Figure 3

You can easily remove the 13mm bolt with a wrench (red arrow) but you will need to reattach the new sensor with a torque wrench as the torque of the bolt is integral to the function of the sensor.

This photo shows what a sensor looks like off the engine.
Figure 4

This photo shows what a sensor looks like off the engine.

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Page last updated: Tue 4/25/2017 02:34:25 AM