Where is the knock sensor on a 2001 Chevy Silverado? One or two knock sensors were included in Chevrolet’s 4.3-litre Vortec V-6 engines. One for every cylinder bank. Both of them are situated below the intake manifold. These sensors picked up on improper combustion of the fuel-air mixture in the cylinder. The engine control module received the information from the knock sensor and changed the engine timing to account for the knock.
What are 4.3 Vortec knock sensor symptoms?
The following are the most common symptoms of a bad knock sensor in a 4.3 Vortec, and if your Chevy Silverado is showing one or more of those symptoms then I recommend testing and replacing the knock sensor.
- Engine warning light comes on.
When your “check engine” light illuminates, whether it is solid or blinking, it is best to have it repaired.
The light could mean a lot of different things, and the majority of them will need to be identified and fixed by a mechanic. More often than you might imagine, your car’s performance is monitored by a computer.
- Reduced engine power.
Reduced engine power is frequently caused by a faulty knock sensor, low engine oil, loose connections, and a blocked catalytic converter.
To overcome decreased engine power, tighten loose connections or clean your oxygen and mass air flow sensors. To overcome decreased engine power, replace your battery or catalytic converter if they are broken.
- Increased fuel consumption.
Driving too fast, accelerating too soon, and stopping abruptly are three examples of this undesirable practice.
High fuel usage can be caused by any one of these three behaviors combined with a malfunctioning knock sensor. If at all feasible, accelerate gradually and follow the flow of traffic.
- Catalyst Damage
A defective knock sensor might harm the catalyst in your car, causing increased HC (hydrocarbons) emissions and sometimes even poorer MPG.
When an engine runs poorly or misfires, the hydrocarbons are discharged into the air but are not fully burned.
- Check Engine Light
Your Silverado’s check engine light can come on if the knock sensor is defective. The knock sensor is somehow connected to any issue code between P0325 and P0334.
You will either receive a code for an intermittent issue, a high input, a low input, or an open circuit.
No matter what the code’s description, it usually indicates that the sensor in question is faulty or that there is a problem with the wiring harness.
How to replace a knock sensor on Chevy Silverado?
- Access the intake manifold in step one.
- Remove the fuel lines in step two.
- Disconnect the engine wiring harness and injectors.
- Replace the knock sensors in step four.
- Replace the components you removed.
Watch the following video for a better understanding.
How much does it cost to replace a knock sensor on Silverado?
Replacement knock sensors for a Chevrolet Silverado 1500 cost, on average, between $165 and $206. While parts are priced between $71 and $87, labour charges are predicted to be between $94 and $119. Taxes and other fees are not included in this range, nor are your particular model year or geographic area is taken into account.
How to test a knock sensor in a 4.3 Vortec easily?
A knock sensor listens for noises like pinging or banging in an engine, such as a spark knock. When an engine makes excessive noise, the device will try to reduce the noise by delaying the time.
One way to check it is to unplug it and see if the symptoms go away, or you may watch your spark progress on a scanner to see if it’s dropping off. Also, take care that unplugging it activates the engine light.
Will a bad knock sensor ruin engine?
Yes, a bad knock sensor can cause serious engine damage if not replaced in a timely manner.
The knock sensor is responsible for detecting engine detonation (knocking) and sending a signal to the car’s computer to adjust the fuel mixture accordingly.
If the knock sensor is not working correctly, the car’s computer may continue to provide too much fuel to the engine, potentially leading to engine damage.
What happens if the knock sensor is unplugged?
If the knock sensor is unplugged, the Engine Control Unit (ECU) will not be able to detect and respond to knocking or detonation in the engine. This can cause engine damage due to excessive heat and pressure, as the ECU will not be able to adjust the ignition timing to compensate for the knocking.