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How to Troubleshoot a Cummins Engine

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Cummins Incorporated produces various types of diesel engines that have a wide variety of uses. It has made significant improvements over the years to become one of the world's largest manufacturers of diesel engines. Like every car, they come with their share of problems. For instance, not properly servicing a defective engine causes internal combustion and ruins your entire machine. Moreover, when your Cummins fuel injection pump malfunctions, you have to either check fuel delivery system or replace the injection pump. Here are some of the most common troubleshooting information to help you solve certain Cummins engine problems.

Fuel System

Since all diesel engines are subject to fuel system problems, it's important to confirm your fuel quality. If your vehicle was running fine until you last fueled it, you should suspect fuel contamination as it tends to slow down or stop the motor. Moreover, if your engine is losing power especially in the cold season, you need to add No. 1 diesel fuel or an anti-gel additive. This is because diesel engines often gel-up at temperature below 10 degrees F making it hard to start your engine.

Ensure that the injection system is clean to supply each cylinder with the correct amount of fuel. Inspect the various injector lines for damage and ensure that they aren't tight at the cylinder head. If your truck starts normally but has low power, check the fuel pump. Search for loose wires or a broken fuse. If these aren't the problem, have the fuel pump output tested by a professional.

Air and Starting Systems

Cummins diesel engine must always have a good supply of air. An engine with low power over a period of time might be having an issue with its air delivery system. Ensure that the air intake systems don't have excessive dirt or debris. A sporadic hissing or metallic noises from the turbocharger as well as a corresponding drop in engine power indicates that your turbocharger is failing.

Low Cranking Speed

Vehicles that are turning over slowly have hard starting problems as a result of Cummins fuel injection pump failing to generate enough fuel pressure to initialize fuel injection. Low cranking speed is more common during the colder season of the year as a result of a dead or faulty battery. Ensure that you change your battery as soon as possible to avoid being stranded in the middle of nowhere.

Diesel Cam Sensor

The Cam or crank sensor is a vital part in all Cummins engine. Ensure that it's not cracked, damaged or loose and if in doubt, change the sensor as they are affordable and will help you check out different problems related to your engine.

Blue Smoke From Your Diesel Exhaust

Blue smoke indicates that your diesel Cummin's engine is burning engine oil. There are other reasons that might suggest why your engine is emitting blue smoke like:

Worn-out piston rings or cylinders
Faulty diesel lift pump
Faulty valve stem seals
Too much engine oil in your car

White Smoke From Your Diesel Exhaust

When white smoke is emitted from the exhaust, it indicates that the diesel fuel injected into your cylinders is not burning correctly. It can also result from:

Fuel starvation to the pump leading to incorrect operation of the fuel pumps timing
Petrol or water contamination in your diesel fuel
Low engine compression
Engine timing out

Black Smoke From Your Diesel Exhaust

Black smoke results from an imbalance in air to fuel ratio. This imbalance occurs when too much fuel is being delivered into the engine by the diesel fuel system or there's not enough air. This smoke can also be caused by: