The Most Common Malfunctions in Diesel Engines and How to Fix Them| Tips & Tricks

Common Diesel Engine Malfunctions It can be very daunting when you start experiencing diesel engine problems, especially when you are not familiar with diesel engines. Diesel engine malfunctions can be caused by wear and tear, but sometimes these problems can be more complex.

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Common malfunctions in diesel engines

This practical guide explores common diesel engine faults so you can be prepared and aware in the unfortunate event you encounter difficulty with a different diesel engine.

Common malfunctions in diesel engines include the following:

• Contaminated fuel.
• Loss of energy.
• Problems at startup.
• Oil oxidation.
• Lots of noise.
• Lots of exhaust.
• Glow plug failure.
• Black exhaust.
• Lead/acid storage battery is faulty.
• Engine temperature rise.
• Oil leakage.
• Oil supply problems.

Now that we know the common malfunctions in diesel engines, let us discuss each of these problems in more detail.

Contaminated fuel

Diesel fuel is denser than gasoline, which is why it can also produce more power per gallon.

Some diesel engines can get better gas mileage than hybrids, but that energy efficiency comes at a cost in some cases.

Diesel fuel is easily contaminated with glycol, soot, and moisture. Contaminated fuel can cause engine performance problems and damage.

Oil oxidation

If your diesel car is not running often, the oil can oxidize and damage the engine.

Oxidized oil means that air bubbles have contaminated the engine oil.

This is common in diesel vehicles that sit without being driven for an extended period of time.

Oxidized oil will not lubricate the engine properly. Instead, it will hurt her.

Loss of energy

Diesel engine power loss can usually be attributed to a fuel or fuel delivery fault.

In case of contaminated fuel this will affect the power of your diesel engine.

Other problems include a clogged fuel injector, a loose throttle link, or engine lubrication problems.

Difficulties start

All diesel engines start when they start, but your engine should start pretty quickly after just a few cranks.

If your diesel engine is becoming more difficult to start, especially on cold mornings, it may just need maintenance.

Diesel engine starting trouble usually indicates poor vehicle maintenance, fuel delivery, or a spark plug problem .

Lots of exhaust

It may seem strange to mention too much exhaust as a common diesel engine problem considering that these engines have a reputation for producing exhaust.

However you should not see excessive exhaust. If there’s a ton of black exhaust coming out of the pipes, you may have too much fuel in the air-fuel mixture or a problem with the EGR valve or turbocharger.

Lots of noise

Finally, you know that diesel engines are louder than most gasoline engines, but the noise should not be excessive or unbearable.

A loud noise, knocking, or anything that seems out of the ordinary indicates something is going on under the hood.

This problem may be with the fuel injectors affecting the engine’s compression balance.

Black exhaust

Diesel engines are efficient these days and don’t spew as much black exhaust into the air as they did in the past.

If you notice that your car or truck is emitting excess black exhaust into the air, your air and fuel mixture is likely out of balance.

If this balance is off, often fuel rich you will notice a blacker exhaust than usual.

Glow plug failure

Diesel engines don’t like cold weather – like most of us right? To make them work when it’s cold outside, engines must have glow plugs. These plugs are very similar to the spark plugs in gasoline engines.

These are very small heaters in the combustion chamber that help start a diesel engine in cold weather when it is less inclined to do so. These plugs wear out like spark plugs.

Lead/acid storage battery is faulty

The car battery is the source of electrical power for the car and is an important part of the operating system, so if it is faulty you will have problems initially.

Engine temperature rise

The first problem found in diesel engines is engine overheating.

Engine overheating occurs when the engine is pushed too hard and can lead to a whole host of negative side effects.

Damage to bearings and crankshaft.

The pistons expand and scrape against the cylinder walls (crushing the head gasket in the process).

Swollen, deformed and broken cylinder heads.

Oil leaks

Oil leaks largely stem from problems with diesel engine parts, such as old seals and gaskets that no longer work effectively.

If left untreated, oil leaks can cause serious diesel engine problems as they pose an environmental threat, serious fire hazards and can lead to complete engine failure.

Oil supply problems

Oil supply problems mostly stem from either incorrect use of oil or a lack of it.

Using the wrong type of oil negatively affects all parts of the engine, while not starting the engine results in it running in air instead of oil, causing the engine to break down in the process.

Important tips for maintaining diesel cars

If you want your diesel engine to continue performing at its best and extend its life, check out the following engine maintenance tips:

Keep your car engine clean

Diesel engines have a longer lifespan than petrol engines and may benefit from regular cleaning.

The more you drive, the more soot, dust, and dirt will accumulate on your engine.

This shortens the life of your engine components and reduces their fuel efficiency.. It goes without saying that keeping your truck and diesel engine clean is important.

Additionally, keeping your engine clean makes it easier for you or your mechanic to notice problems before they lead to bigger problems.

For example in a clean engine you can notice oil leaks, coolant leaks, and broken hoses.

Dirty engine components such as intercoolers and radiators will also affect the performance of your diesel engine. But you can prevent this by cleaning your diesel engine frequently.

Monitor engine fluids

Without motor oil, your car will not be able to run. In fact, the engine will die a natural death.

Oil is very important because it lubricates the moving parts of the engine. Over time, engine oil becomes contaminated and acidic and must be changed regularly.

• Not changing your engine oil regularly reduces your diesel engine’s performance and life.
• Coolant is also important and you should monitor it as well
• Maintain coolant balance with proper chemicals
• At recommended levels, it prevents engine overheating.