Diesel vs. Gas Engines: Common Repair Issues and How to Prevent Them

Ashleigh Mullen
Dec 11, 2025
2 min read

When it comes to keeping your vehicle, or your entire fleet, on the road, understanding the unique needs of diesel and gas engines is crucial. Each engine type has its own strengths and challenges, and knowing what to watch for can save you time, money, and headaches down the line.

Key Differences Between Diesel and Gas Engines

Diesel engines are typically used in heavy-duty vehicles and commercial fleets due to their durability and fuel efficiency.
Gas engines are common in passenger vehicles and light-duty trucks, offering smoother acceleration and lower upfront costs.

Common Repair Issues for Diesel Engines

Fuel Injector Problems: Clogged or failing injectors can lead to poor performance and increased emissions.
Turbocharger Failures: Turbo issues can reduce power and efficiency, often caused by oil contamination or lack of maintenance.
Glow Plug Issues: Faulty glow plugs make cold starts difficult and can damage the engine over time.
Clogged Fuel Filters: Dirty filters restrict fuel flow and strain the engine.

Prevention Tips:

Use high-quality diesel fuel
Change fuel filters regularly
Schedule routine inspections and maintenance

Common Repair Issues for Gas Engines (super common)

Spark Plug Failures: Worn or fouled spark plugs cause misfires and poor fuel economy.
Ignition Coil Issues: Bad coils can lead to hard starts and engine stalling.
Overheating Problems: Cooling system failures risk major engine damage.
Exhaust System Troubles: Leaks or blockages affect performance and emissions.

Prevention Tips:

Get regular tune-ups
Check coolant levels and replace as needed
Inspect exhaust components during routine service

Why Preventative Maintenance Matters

Cuts down on unexpected breakdowns
Extends the life of your vehicles
Keeps your fleet safe and compliant

How Dedicated Repair Can Help

At Dedicated Repair, our technicians are experts in both diesel and gas engines. We offer comprehensive maintenance packages, fast diagnostics, and reliable repairs to keep your vehicles running at their best.

Ready to schedule a maintenance check or need expert advice? Contact us today and keep your vehicles moving! #920-863-2967