What happens if knock sensor fails

If the knock sensor is bad, it will not relay that knock is occurring and will not, therefore, alter ignition timing. It can be difficult to hear engine knock at speed since road and wind noise is also a factor, so acceleration and excessive engine vibration issues should be examined as soon as they present themselves.

The aforementioned sound test can easily be performed when safely in a parking lot off the road. Fuel economy can also suffer from incorrect combustion timing or additional combustion within the engine.

Poor fuel economy is rarely the only sign of a bad engine knock sensor because it can be related to so many issues from so many different vehicle systems. With this in mind, fuel economy is more of a supplementary symptom of engine knock than a primary symptom. The easiest way to specifically identify a bad engine knock sensor is the illumination of the check engine light. Beyond actually hearing the infamous engine knock associated with the sensor, an OBD scanner is the easiest way to diagnose a faulty sensor because it shows the exact code associated with this specific issue.

Engine and piston failure usually only occur if the owner of the vehicle has neglected to have the issue fixed. There are multiple other ways to tell if the engine knock sensor has failed before extensive engine damage occurs. Therefore, it is important to have these issues investigated as soon as problems arise to mitigate costlier future damage to major components.

Some amount of engine knock occurs almost all the time in each engine due to continually changing environmental factors. A functioning knock sensor can mitigate this and helps an engine run as well as possible under a variety of conditions. My GMC Canyon sle has mi.

I am using regular unleaded gasoline. When truck is in lower speed, it makes knocking noise. As I drive above 40 mi per hour, the noise stops.

On the freeway I can here that noise too, but not as loud. Do you think changing the knock sensor can help eliminate that nagging noise? Thank you Mars. Does the knocking noise change with RPM? I had my Kia Sportage Ex brought to 2 separate mechanics,. Still no change,thats when we were told bad engine due to low compressions especially on 3 and 5 cylinders. We were going to replace the engine when the other mechanic decided to check and change the knock sensors.

He said it was ideal after he replaced the knock sensors,changed the plugs and wires. Tomorrow we will return to the mechanic but meanwhile did he do anything useful? He did not provide the updated compressions. Or any proof,info. So using our own OBD2 reader,it displays the same.

And check engine light on. It does drive great,however on the flip side,its still not running right,and the cel is on,. Yet the OBD reader says 3 and 5,multi and recently a torque converter clutch,P He the mechanic seemed oblivious to that when I showed him the photo I took of that read out on my cell from the obd reader. Any advice? Changing the knock sensor, plugs, and wires will not affect compression. What were the compression numbers? I have a Mini Cooper with 67k miles on it.

What does it mean? The light disappeared the next day. This may be a wiring issue, a problem with the knock sensor, or a bad ground. I newly replaced my knock sensor, and when I scanned it using OBDll it says check engine particular in the knock sensor.. I dont have any idea please help. It could be an electrical issue such as a bad ground or weak connection somewhere. Check the wiring leading to the knock sensor to see if anything may have rubbed the insulation away. Check all grounds to make sure they are clean and tight.

I will be cruising and suddenly revs will drop completely and I will have no power for a couple of seconds. Other than that, car runs perfect. Just yesterday, got an engine light which I read to be a faulty knock sensor. Do you think these two things could be related? Could be related, not sure. Do you have any mods?

If so, are you running a tune that supports them? These cars pull a lot of timing and lose power when you use a lower octane. Can a knock sensor react to a bad spark plug or coil pack? My 8 cylinder Chevy Silverado seems to run fine but it has the KS code.

Through loud knocking noises, pinging sounds, reduced engine performance, and poor fuel mileage, the signs of a bad knock sensor can prevent this issue from permanently damaging the engine. When you step on the gas pedal in your vehicle and you hear a slight noise coming from the pedal or the engine, this is what an engine knock is. What you are hearing when this happens is pre-ignition, which generally occurs when there is a pocket of the air and fuel mixture that is igniting before the flame is occurring from the spark plug.

If this happens in your car, then there is a small electrical current that happens near the explosion, increasing the pressure within the cylinder. In most cases, the engine knocking can lead to severe damage in the engine , causing an expensive repair or replacement, and meaning that the bad knock sensor can damage the engine.

In an older engine where the ignition timing can be changed to fit your needs, the engine knocking can be analyzed and fixed by slowing down the timing just a little.

In addition, water injection could be a potential solution. When engine knock occurs in your vehicle, the knock sensor is in charge of keeping your engine in good shape and preventing a bad knock sensor from damaging the engine. This detonation that occurs too early is often referred to as engine knocking. There is a knock sensor that is in charge of regulating the engine, detecting the vibrations and the detonations and sending the correct voltage signals to the powertrain control module.

This can alter if a bad knock sensor can damage your engine. Generally called the PCM in your vehicle, this automotive control unit combines the engine control and the transmission control unit. This can help prevent the engine from gaining further damage and needing a repair or replacement. This shows how a bad knock sensor can damage the engine. If your knock sensor were to malfunction or become damaged in your vehicle, there would be clear symptoms that a drive and passenger would notice.

One of the first symptoms that is the most visually noticeable for the driver to see when determining the healthiness of your engine and knock sensor is the engine warning light coming on.

You might notice this show up on your engine dashboard. Although this can happen due to many reasons, one of the main reasons of hte engine warning light coming on is a poor knock sensor.

Should I change the knock sensor again even if the check engine light is off? I am really confused, I will appreciate your feedback. What unusual engine sounds are you experiencing? Check your fuel trims to make sure your air fuel ratios are about where they should be.

If they are extremely lean or rich, you likely still have a mechanical problem that is causing the loss of acceleration. As a sanity check, you may want to test that your new knock sensor is functioning properly. You should be able to find a procedure for this in the factory service manual. I have a Honda Accord V6, I got a check engine light and the dealer ship told me that I have a bad knock sensor.

But as they did not have the item in stock they did some temporary fix. Is it fine to drive like this? You could look closer at scan data to see how intense the knock event was, and how much timing is being pulled. Minor knock under light load is no cause for concern but an intense knock event under wide open throttle could destroy the engine. Hi, I have a 9speed fiat Ducato Motorhome. Two weeks ago at only 6 months old it was re-programmed to rectify the consumption of Ad-blue.

The alarm light for ad-blue kept coming on at kms but it was a false reading as ad-blue tank was still almost full. False sensor reading.

Now with only 30kms driving since re-programming the engine light came on and the vehicle went into limp mode.