Curing an Intermittent Rough Running Diesel Engine

Aug 5, 2020


Welcome to Grafco Electric, the experts in diesel engine optimization. If you are experiencing an intermittent rough running diesel engine, you've come to the right place. In this comprehensive guide, we will discuss the common causes of rough running engines and provide you with effective solutions to restore your engine's performance.

Understanding Rough Running Engines

A rough running diesel engine can be frustrating and may indicate underlying issues that require immediate attention. Here are some common causes of rough running engines:

1. Fuel Quality

Poor quality fuel can lead to combustion problems, resulting in a rough running engine. It's important to ensure that you are using high-quality diesel fuel from reputable sources.

2. Clogged Fuel Filters

Clogged fuel filters restrict the flow of fuel to the engine, causing it to run rough. Regularly inspect and replace fuel filters to prevent this issue.

3. Air Intake Issues

Air intake problems, such as clogged air filters or damaged intake hoses, can disrupt the air-fuel mixture and lead to rough engine operation. Check and clean the air intake system regularly.

4. Faulty Injectors

Worn or faulty fuel injectors can cause uneven fuel distribution, resulting in rough running engines. Consider having your injectors inspected and serviced by a qualified technician.

5. Ignition System Problems

Issues with the ignition system, such as worn spark plugs or malfunctioning ignition coils, can lead to inconsistent combustion and rough engine performance. Ensure regular maintenance of the ignition system.

6. Engine Timing

Incorrect engine timing can cause fuel combustion to occur at the wrong moment, compromising engine performance. It's crucial to have your engine's timing checked and adjusted if necessary.

Solutions for Rough Running Engines

Now that we have covered the common causes, let's explore some effective solutions to cure an intermittent rough running diesel engine:

1. Fuel Additives

Consider using fuel additives specifically designed to clean the fuel system and improve combustion. These additives can help remove deposits and improve fuel quality, leading to smoother engine operation.

2. Regular Maintenance

Maintaining your diesel engine is crucial for optimal performance. Regularly change fuel filters, air filters, and perform routine maintenance tasks recommended by the manufacturer.

3. Professional Inspection

If the rough running issue persists, it is advisable to consult a professional diesel engine technician. They have the expertise to diagnose and provide tailored solutions for your specific engine problems.

4. System Upgrades

In some cases, upgrading certain engine components, such as injectors or ignition system parts, might be necessary to improve performance. Consult with an expert technician to determine if upgrades are required for your engine.

5. Ensuring Proper Installation

If you have recently installed new engine parts or components, ensure that they are properly installed and calibrated. Incorrect installation can lead to rough engine operation.


Don't let an intermittent rough running diesel engine affect the performance of your vehicle or equipment. Follow the solutions outlined in this guide and consult with professionals when needed. Grafco Electric is dedicated to helping you optimize your diesel engine's performance. Contact us for any further assistance or inquiries. We are here to ensure your engine runs smoothly and efficiently.

Jan Morgan
This article is a lifesaver! My diesel engine has been running rough on and off lately, and I'm relieved to have found this guide. The information provided is clear and concise, making it easy for me to understand the causes and solutions for my engine's rough running. Thank you, Grafco Electric, for sharing your expertise and helping me restore my engine's performance.
Nov 10, 2023