A negative knock sensor can cause some significant engine damage. Prior to that happens, inspect out this handy overview on replacing knock sensors in your Silverado.

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This article applies to the Chevrolet Silverado GMT800 (1999-2006).

Knock sensors play vital as well together essential role in her Silverado"s engine functionality, detecting any kind of engine noises resulted in by early detonation and also adjusting the ignition-timing accordingly. When a hit sensor fails, detonation is not properly regulated and also serious engine damages can occur, leading to some an extremely costly repairs. Symptom of a negative knock sensor incorporate a check engine light, loud thumping noises comes from the engine, or shaking, vibrating, and also misfires on a cold start. Keep analysis as this short article will display you just how to replace a faulty hit sensor in your Silverado prior to costly damages occur.


Materials Needed1/4" and 3/8" drive ratchets22mm deep fine socketTorque wrenchFuel heat removal toolReplacement knock sensors (2)Knock sensor sub-harnessIntake manifold gaskets (optional)Shop rags or tiny containerRTV sealant
Pro Tip

In enhancement to replacing the hit sensor, preventative maintain can additional reduce detonation.

Lower the compression ratioUse greater octane fuelAdd injector cleaner right into the fuel tankRetard the ignition timing

Step 1 – accessibility the intake manifold

Always disconnect the negative battery terminal (black cover) once working under the hood.Remove the intake water tap by loosening the water tap clamp on each end: one by the MAF and also the other by the throttle body.Then, eliminate the accelerator cable and cruise manage cable indigenous the throttle body. If you have actually a 2003 and also up Silverado, you likewise need to unplug the drive-by-wire harness.Remove the accelerator cable bracket from the input manifold, and also push the bracket in addition to the cables turn off to the side.Unbolt the key engine harness bracket top top the driver"s side of the input manifold.Unplug the EVAP solenoid, MAP sensor, and knock sensor sub-harness.Remove the throttle body and set it aside.Remove the vent hoses from each valve cover.Relieve fuel pressure through the Schrader valve on the fuel rail crossover, and also use a rag or tiny container come catch any gas operation off.
Figure 1. Push the facility pin the the Schrader valve to relax pressure.

Step 2 – remove the fuel lines

Use a fuel heat removal device to disconnect the fuel lines native the fuel rails. The fuel rails are situated at the rear, driver"s side of the entry manifold. Use a rag or little container to record any loosened gas.1999 come 2003 Silverados have actually a supply and also return line, when 2004 and also up Silverados execute not have a return line.Use the fuel line removal device to remove the EVAP heat located in between the engine and also the firewall.
Figure 2. Remove the fuel lines indigenous the fuel rails.

Step 3 – eliminate the injectors and engine wire harness

Unplug and remove every eight fuel injectors and also connectors.Disconnect the vacuum heat from the brake booster.Pull the engine harness to the side, and unplug the alternator connector.Unplug the idle air manage valve.Unplug the throttle place sensor on the throttle body.
Figure 3. Unplug the fuel injector connectors.

Step 4 – replace the punch sensors

Remove all of the intake manifold bolts in the turning back order to your bolted down sequence (10 to 1). Refer to number 4 below.Pull the manifold off. The hit sensors are located underneath the black color plugs linked to a wire harness.Pull the plugs out and unbolt both knock sensors using a 22mm deep well socket.Install the new sensors and also torque them to exactly 15 ft-lbs.Apply some RTV come the rubber plugs to stop water native entering.
Figure 4. Diagram with intake manifold bolt sequence.
Figure 5. Unplug the cable harness, eliminate the knock sensors, and apply RTV sealant.
Figure 6. Installed knock sensors through RTV sealant.

Step 5 – Re-install the eliminated components

Clip the brand-new intake manifold gaskets to the intake manifold. Do sure all of the surfaces room clean.Set the manifold earlier onto the engine, and torque the bolts in their correct bespeak (1 come 10). Refer to figure 7. Very first torque each bolt come 44 in-lbs, and also then come 89 in-lbs.Put the accelerator body ago in place, and torque it come 106 in-lbs.Connect the knock sensor plugs from the cable harness.Plug in all the remaining sensors.Reconnect the fuel lines, EVAP line, brackets, and also intake hose.Reconnect the an adverse battery terminal (black), and also start the truck to for sure the engine knock has disappeared.

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Figure 7. Input manifold bolt sequence through torque specs.

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