Knocking noise from engine and loss of power

Was driving on the highway and suddenly the check engine light came on and lost engine power and is knocking

My car has 119000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
The illumination of the check engine light means that diagnostic trouble codes were set during this incident. The codes are probably "related" to the knocking noise. If there was a mechanical failure in the engine, these codes could have simply been set as a "consequence". That is, the principal issue could be a mechanical failure. It is also possible though for ignition and/or fuel system failures to create strange noises, if and as individual cylinders fail. You do have one of the more common engines, so replacements are easy to come by. Generally it is an outstanding engine design based on mechanical operation, power, fuel economy and serviceability. YourMechanic has trained professionals who can travel to your location to determine the best solution to this engine problem.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Commonly, engine knocking occurs because of a buildup of oily carbon deposits inside the combustion chamber. This can be caused by burning oil or incomplete combustion from misfires, which coats pistons, cylinder heads, and other parts of your engine with residue.
One of the most common causes of engine knocking is low oil. If your car has been using more oil than usual, it`s a good idea to top it off. You can also try using a higher-quality oil, as this can help reduce engine wear. It`s important to regularly change your oil because dirty oil can also cause knocking.
The spontaneous ignition of air/fuel inside the cylinders is a common source of engine knock. While the description of the sound may differ, the circumstances under which it occurs are often the same – low-speed, high-torque conditions common when you`re accelerating.
The wrong blend of fuel and air can cause multiple ignition points, creating those knocking noises you can hear. At the other end of the spectrum, it could be worn out or loose rod bearings, timing belt problems, or your engine preparing to seize.
If you hear a light knocking or pounding sound, the noise can usually be traced back to your connecting rods. This sound is often most noticeable when the engine is at an even rpm–not accelerating or decelerating–and is often caused by a worn bearing or crankpin, misaligned connecting rod, or lack of oil.
Spark Plugs That Are Worn or Misfiring

If your spark plugs are overdue for replacement, your engine knock could be attributed to that and you may also lose engine power.

In case of a knock sensor failure, the PCM may not be able to recognize or fix the spark knock frequency. The failed sensor can result in a metallic pinging noise from the engine. You`ll also notice that the noise gets most prominent when the engine is under a heavy load.
FAULTY KNOCK SENSOR: SYMPTOMS

Engine warning light comes on. Error code is stored. Reduced engine power. Increased fuel consumption.

If you start to notice rod knock, this isn`t a problem that will just resolve itself—you must take immediate action and replace the rod bearing while also fixing any other parts associated with the sound. If you do not take action quickly enough, you might need to replace the engine entirely.
A bad or faulty connected VVT solenoid can and often does cause engine knocking, inconsistent idle and acceleration problems. The issue could be with the solenoid itself or the electrical harness connected to the VVT.
If you start to notice rod knock, this isn`t a problem that will just resolve itself—you must take immediate action and replace the rod bearing while also fixing any other parts associated with the sound. If you do not take action quickly enough, you might need to replace the engine entirely.
Once an engine starts to knock, the rod can fracture without warning. It could be the next time you start it in your driveway, or it could keep going for six months. Eventually though, the engine will blow and you`ll be stranded somewhere.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Check engine on knocking engine milky cap but not in oil change loud knocking noise while driving and cold start up
ANSWER : Coolant leaks can be external or internal. If the coolant is leaking internally into the cylinders or crankcase, that will require a fairly significant repair. If the coolant is leaking externally, unless the leak is at the head gasket or the lower intake manifold, external leaks can be repaired readily. On the engine you have it was really common to have coolant leaks at the lower intake manifold, so common that the gasket there was completely designed and a different repair procedure was specified (higher torque on the manifold studs). To get the coolant leak diagnosed, please use YourMechanic’s coolant leak diagnostic service link. The knocking noise is obviously of concern. Unfortunately, typically, such noise is from worn bearings, connecting rods, and other major components. The noise might be accompanied by low oil pressure. My best advice is have the cooling leak diagnosed in case that is readily resolvable. The mechanic can evaluate the noise and if it is internal the engine will eventually have to be disassembled and rebuilt. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Engine malfunction light, reduced engine power, engine powered down
ANSWER : Hi there. There are a lot of things that can cause this on your 2012 BMW M5. I usually start by scanning the computer for codes to see what comes up. If there are not codes then I load test the alternator and the battery to see if they are failing. Low voltage in the electrical system will cause this. If that is fine, then it is usually caused by a failing throttle body. I have seen a lot of these fail due to the motors in them hanging up. If the problem is only happening intermittently, this can make the issue hard to duplicate, but you can still have tests done on the car. If you are going to have this fixed, consider YourMechanic, as a certified mechanic can come to your home or office to test the vehicle and diagnose the Engine Malfunction Light.

Noise in the frontal area off the engine near the fan
ANSWER : Hello, thank you for writing in. There must be more diagnostic work and testing done to determine what the issue is. Without a drive or timing belt, the engine would either not run at all, or perform very poorly. This does not mean that an inspection of the timing belt/chain should not be done. There are other components in the timing belt system that can become damaged and cause issues. The valve and lifter consideration is valid, and can be inspected visually with some time and energy. Unfortunately you may also have crankshaft end play or a bad camshaft bearing. Use the location of the sound to help you determine what to check into first. One by one, check into the systems in that area until you find the culprit. For more help resolving the noise, contact our service department.

Reduce engine power / check engine light is on
ANSWER : Hi there. Most of the time, reduced engine power is caused by a restriction of fuel, or the throttle body’s inability to efficiently mix air and fuel. This could be caused by a failing mass air flow sensor, EGR valve or other fuel system components. Since the check engine light is on, you should have a professional mechanic complete an inspection at your location to determine what codes are stored and which components require repair. This should resolve your issue.

Can front wheel drive car engine power rear wheel drive
ANSWER : Anything is possible with enough engineering. The changes you are looking at would take major structural changes and would definitely not be an easy job. You could possibly consult a manufacturing engineer to get more details on how this could actually be carried out and whether it would be feasible.

Car sometimes give me acceleration and power issues. Engine power reduced message and engine light appear intermittently.
ANSWER : It is possible that your vehicle’s PCM has failed. This is somewhat of a common problem amongst many GM vehicles. If the computer has failed, this could be one of the reasons that no trouble codes are appearing and the fact that the problem is intermittent. It is possible that the computer is somehow getting overheated and by stopping the vehicle for a short period of time, the PCM cools down allowing the vehicle to run again. I would recommend having your PCM tested for proper function by a certified technician with experience in computer diagnostics.

Turned on back winow heater and engine made a noise …when lights are turned on engine makes a noise like it can’t take load ….
ANSWER : Hi there. It appears you have more than one problem with your vehicle. The noise coming from engine area with a load on the electrical system, may be a bad diode in the alternator. Continuing to drive the vehicle with a bad alternator diode, may leave you with a dead battery. The hot air coming from the vents sounds like blend door actuator(s) problems. I recommend the concerns your vehicle has, it be inspected by a certified technician like one from YourMechanic to pinpoint the noise and help you fix it accordingly.

Check engine light on, power loss in fourth gear
ANSWER : Many different faults can be attributed to your 2008 Chevrolet Aveo5’s loss of power. In cases where the Check Engine Light has not set a hard code, it can be a bit harder to pinpoint the issue.

If the spark plugs were replaced when the Check Engine Light was able to be read, I can only guess that the code was for a misfire without knowing the actual code. The most likely causes of a loss of power would be a misfire, spark plugs, fuel pump, fuel filter, oxygen sensor, MAF sensor or vacuum leak. A qualified technician, such as one from YourMechanic, will be able to diagnose the vehicle’s loss of power and perform any repairs required.