If you ever experience difficulties with your engine on the road, it’s helpful to know how to identify the issue and, and when possible, fix it.
Troubleshooting your vehicle can save you money on easy-to-fix problems and spare you a lengthy trip to your local repair shop. Temporary repairs can dull the symptoms of complicated, harder-to-fix issues, which will afford you enough time to drive to a local mechanic.
This guide will teach you how to troubleshoot a diesel engine’s most frequently encountered problems.
Visible Smoke
Excess, visible smoke is one of the first signs of troubled engine. Smoke can cause unpleasant odors to fill the cab, which poses a potential health threat. Examining the color of the smoke can help you identify the underlying issue.
White Smoke
White smoke indicates problems with engine timing. It can also mean that your engine compression is weak.
Blue Smoke
Blue smoke is caused by burnt oil, and is a telltale sign of worn valves, cylinders, or piston rings.
Black or Grey Smoke
Dirty air filters, bad injectors, or issues with the turbocharger or cylinder heads can all cause your exhaust to expel dirty, soot-colored smoke.
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There’s a wide range of things that can cause an engine to overheat. The weather is one of them. On balmy, humid days, it’s recommended that you gear down and turn off the air conditioning on steep grades.
If the weather is decently cool, you’ll have to consider other factors. Check the radiator and ensure that it’s free of debris.
Make sure that the brakes and tires are functioning properly. Are they dragging? Are the axles rolling freely? Next, take a good, long look at the engine fan and belts and ensure that they’re working properly.
When and if the engine cools, check your vehicle’s oil and coolant levels. See if there’s any leaking, and if so, determine the source of the leak.
Engine Won’t Start
Slow, stalled engines are every driver’s worst nightmare. In the unfortunate circumstance that it happens, you’ll want to examine your fuel supply. Check for any visible contamination.
If you can, replace any clogged fuel filters—and don’t forget to check the fuel lines and pump. Air filters are important, too. A plugged filter could starve your motor.
Make sure your batteries are connected to the starter, and check to see if the starter itself is damaged.
If you can’t figure out the issue and fix it on your own, you might need to have a mechanic check the injectors. If you’re feeling handy, purchase your own fuel injection parts and perform the necessary maintenance yourself.
Knowing how to troubleshoot your diesel engine is a useful skill—but you should never ever troubleshoot complicated issues on your own. Any small mistakes you make could severely damage or compromise your vehicle. If the problems are out of your expertise, take your vehicle to a professional diesel mechanic.
