Bobcat S220 Rough Running and Smoking Issues

[MikePhua]

On the panswork forum, a user reported issues with their Bobcat S220 skid steer, which was running rough and emitting smoke. The machine’s performance had degraded, leading to concerns about potential engine or system failures. Below is a breakdown of the potential causes, troubleshooting steps, and solutions suggested by the community.
Problem Description
The Bobcat S220 skid steer was exhibiting two primary symptoms: rough running and excessive smoke. The user noted that the engine wasn’t operating smoothly, and the smoke was particularly noticeable during operation, leading to a potential issue that required attention.
Potential Causes and Troubleshooting

1. Fuel System Issues
   One of the first things to check when a machine is running rough and smoking is the fuel system. Common problems include:
   • Clogged Fuel Injectors: If the injectors are clogged or not functioning properly, it can cause rough running and excessive smoke. Cleaning or replacing the injectors could resolve this issue.
     
   • Fuel Quality: Poor-quality or contaminated fuel can lead to improper combustion, causing both rough running and smoking. Ensure the fuel is clean and free from contaminants.
     
   • Fuel Filter: A clogged or dirty fuel filter can restrict fuel flow, leading to rough engine performance. Replacing the fuel filter might solve the issue.
     
2. Air Intake Problems
   The user also suggested that air intake issues could be causing the rough running and smoking. Restricted airflow due to a clogged air filter or malfunctioning air intake components can cause improper combustion and lead to smoke. Check the air filter for clogs and replace it if necessary. Additionally, ensure the air intake system is clear of any debris.
   
3. Oil Contamination or Low Oil Levels
   Another potential cause for the smoke could be oil-related issues. If the oil is overfilled, contaminated, or if it’s too thick (especially in cold weather), it can cause excessive smoke and poor engine performance. Check the oil levels, quality, and condition. Changing the oil and ensuring the correct type of oil is used can resolve the issue.
   
4. Exhaust System Blockage
   A blocked exhaust system can also lead to poor engine performance and smoking. If there’s a build-up in the exhaust system, it can cause back pressure, resulting in rough running and excessive smoke. Inspect the exhaust for any obstructions or damage.
   
5. Overheating Engine
   Overheating is another cause for rough engine performance and smoking. If the engine is running too hot, it can cause the oil to break down and produce smoke. Ensure that the cooling system is functioning properly. Check the radiator, coolant levels, and ensure there are no blockages preventing proper cooling.
   

Steps to Resolve the Issue

• Inspect the Fuel System: Begin by checking the fuel quality, replacing the fuel filter, and cleaning the fuel injectors.
  
• Check the Air Filter and Intake: Inspect the air filter for any obstructions and replace it if necessary. Also, ensure the intake system is clear.
  
• Examine the Oil: Check the oil for contamination or overfilling. Change the oil if it appears thick or dirty, and ensure the correct oil type is used.
  
• Inspect the Exhaust System: Check the exhaust for blockages or restrictions that could cause back pressure and affect engine performance.
  
• Cooling System Check: Ensure the cooling system is functioning properly by checking the coolant levels and inspecting the radiator for clogs.
  

Conclusion
The rough running and smoking issues on the Bobcat S220 skid steer can often be traced to fuel, air intake, oil, exhaust, or cooling system issues. By thoroughly inspecting and addressing these potential causes, users can resolve the problem and restore the machine’s performance. Regular maintenance and monitoring of the machine's components will help prevent such issues in the future and keep the Bobcat S220 running smoothly.