6 Symptoms of a Bent Engine Valve and How to Test for It — UNDERTHEHOOD®

Engine hassles are the last thing you want to deal with. However, it does happen. An embarrassing situation that can trigger a headache is a bent engine valve. What are the signs of bent engine valves and how critical is the fault?

Since engine valves are a vital part of the engine, it is necessary to fix these problems quickly. We will see the operation of the engine valves and contact on the panels when one is twisted. Our information also shows how to check for bent engine valves.

6 symptoms of bent engine valves

1. Check Engine Light

Modern automobiles monitor all of your car’s engine sensors in real time to check that its efficiency is perfect. If something is wrong with any of the sensors or a parameter is out of range, this will sweeten the test engine smoothly into your dashboard.

If any of your engine valves are bent, it will undoubtedly end in a smooth test engine. You can test the trouble codes with an OBD2 scanner to find any trouble codes associated with the air-fuel combination.

Engine valves are not digital and later trouble codes will not say an engine valve is bent immediately, but it could say something about misfires or faulty air-fuel combinations.

2. Engine Backfires


If an exhaust valve is bent, it impacts the way the fumes travel away from the cylinder. Exhaust valves must open and close at specific times to ensure that the correct amount of stress is present at all times.

A bent exhaust valve can find you in a bad spot. It may also not seal properly when closed. This fault causes an exhaust leak which affects the way the gas is burned.

When the ECU notices the problem, it overcompensates by changing the amount of gas that will be delivered to the cylinder. When the cylinder runs heavily, the unburned gas escapes into the exhaust, which produces a backfiring or popping noise.

3. Low compression

Compression test

When the engine is running, there is a buildup of stress contained within the cylinder, often referred to as compression. Bent engine valves usually cause a compression imbalance. When this stress is simply too low, the course of combustion is affected and the gas cannot burn properly.

The bent engine valve creates low compression because it no longer closes properly, leaving the defective gasket with the cylinder head. As air or exhaust gases escape, compression is thrown off, causing wasted energy and other efficiency issues.

If you discover low compression during a compression check, it’s probably time to test your engine’s valves to make sure they don’t appear to be leaking.

4. Shaking motor

Bent engine valves are infamous for altering the smooth running of the engine. If a valve is broken due to something resembling a damaged timing belt, the engine may begin to rumble due to misfiring. You may experience this supplement generally when idling or driving at slower speeds.

Depending on the severity of the valve rupture, you may be able to drive for a short time. However, badly broken valves could cause the engine to shut down completely.

5. Lack of power

Bent engine valves almost anytime result in no power. In many cases, these energy points come from a reduction in stress in the cylinder caused by the broken valve. When the valve does not close properly or sit where it should, the combustion suit will likely be ejected.

Also, the installation points can come from the engine running well to compensate for the problems caused by the bent valve. Either way, it needs to be fixed because the problem will only get worse over time.

6. Excessive oil consumption

Engine valves must be lubricated to function properly. With the help of the valve seal, the valve stem is lubricated with oil when it strikes. However, the oil is prevented from transferring into the cylinder using the valve seal.

A worn or broken seal can occur when the valve bends. These damaged seals allow oil to seep into the combustion chamber. This fault causes an extreme amount of oil to burn. It can also have an effect on engine operation and damage the catalytic converter if it is not fixed quickly.

If you see blue smoke coming out of your exhaust pipe, it could be caused by a bent engine valve causing the valve seal to leak.

What are engine valves?

Engine valves

The valves are the elements that help manage the movement of air through the engine. During the consumption stroke, the consumption valves open to allow air to enter the combustion chamber. During the exhaust stroke, the exhaust valves open to allow burnt combustion to exit the chamber.

When the compression stroke occurs, each of the intake and exhaust valves must remain closed to create stress before the combustion suit can be ignited. This combustion drive supplies your car with its energy.

Inside the cylinder head is where you can see the exhaust and intake valves. Most cars have two of each per cylinder. Therefore, a four-cylinder engine incorporates 16 full valves. However, some LS V8 engines used by GM include only one exhaust and intake valve per cylinder, giving you a total of 16 valves.

How to Test for Bent Engine Valves

To check for a bent engine valve, the best test would require you to remove the cylinder head and take a bodily look at the valve. However, this is extra work that most individuals want to take care of, which is why compression exams and leak exams are helpful.

With a compression test, you can quickly see how much compression each cylinder produces. This is an easy fix to see how the engine is working.

If you discover that a cylinder is low, you will transfer it to the leak check. With this diagnosis you can possibly inform when the air is escaping from the engine. The leak check will snag as much as the spark plug gap. Once this is achieved the crankshaft will be rotated until the cylinder is in the compression stroke. This is while you hear where the air is escaping from the engine.

If the air is coming from the intake, it looks like you are dealing with a bent intake valve. On the other hand, the air coming from the exhaust factors to a bent exhaust valve. However, air coming out of these places can also imply that there is simply carbon buildup on the valves, causing poor sealing. Further diagnostics may be requested by a professional mechanic if you are unsure.

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