Troubleshooting Bobcat T190 Engine Stalling Issues: Causes and Solutions

[MikePhua]

The Bobcat T190 is a versatile and reliable skid steer loader used in a wide range of applications, from construction to landscaping. With its compact size and powerful hydraulics, it’s an essential piece of equipment on many job sites. However, like all machines, it can experience mechanical problems from time to time. One such issue that operators may encounter is engine stalling during operation, which can cause unexpected downtime and frustration.
In this article, we’ll explore the possible causes of engine stalling on the Bobcat T190, how to troubleshoot and resolve the issue, and what preventative measures can be taken to avoid future stalling problems.
Common Causes of Engine Stalling
Engine stalling on the Bobcat T190 can occur for several reasons, and understanding the root cause is crucial for effective troubleshooting. The most common culprits are related to fuel delivery, electrical systems, and engine components.

1. Fuel Supply Issues
   One of the most common causes of engine stalling is a problem with fuel supply. If the engine isn’t receiving enough fuel, it will stall. Here are some fuel-related issues to check:
   • Clogged Fuel Filter: Over time, fuel filters can become clogged with dirt, debris, and contaminants. This can restrict fuel flow to the engine, causing it to stall, especially under load. Regularly replacing the fuel filter can help prevent this problem.
     
   • Contaminated Fuel: If the fuel has been contaminated with water or dirt, it can cause the engine to run poorly and eventually stall. It’s essential to use clean, high-quality fuel and to inspect the fuel tank for any signs of contamination.
     
   • Faulty Fuel Pump: A malfunctioning fuel pump may fail to deliver the required fuel pressure, leading to stalling. If the fuel pump is faulty, it will need to be replaced to restore proper operation.
     
2. Air Intake Problems
   The air-fuel mixture needs to be in the proper ratio for the engine to run smoothly. If there’s an issue with the air intake system, the engine may stall due to a lack of air or an imbalance in the mixture. Consider the following:
   • Dirty Air Filter: A clogged air filter can restrict airflow to the engine, leading to an overly rich fuel mixture and causing the engine to stall. Check and clean or replace the air filter regularly to maintain proper airflow.
     
   • Intake Leaks: Leaks in the intake system can disrupt the air-fuel mixture, causing the engine to stall. Inspect the intake manifold and hoses for cracks or loose connections.
     
3. Electrical System Faults
   Electrical issues can also lead to engine stalling on the Bobcat T190. These issues may range from simple wiring problems to more complex issues with sensors or the ignition system.
   • Faulty Ignition System: If the ignition system is malfunctioning, the engine may stall due to a weak spark. This can be caused by worn spark plugs, faulty ignition coils, or problems with the ignition module.
     
   • Battery or Alternator Problems: If the battery is not charging properly or the alternator is malfunctioning, it can cause the engine to stall due to a lack of power. Check the battery for corrosion and ensure the alternator is producing the correct voltage.
     
   • Sensor Issues: The Bobcat T190 is equipped with various sensors, including the throttle position sensor and mass airflow sensor. If these sensors fail or become dirty, they can send incorrect signals to the engine control unit (ECU), causing the engine to stall.
     
4. Overheating
   Engine overheating can cause the Bobcat T190 to stall, especially if the engine’s temperature exceeds safe operating levels. Overheating can be caused by:
   • Low Coolant Levels: Insufficient coolant can lead to engine overheating, causing the engine to stall as a safety precaution. Regularly check coolant levels and top off as needed.
     
   • Faulty Thermostat: A malfunctioning thermostat can cause the engine to overheat by preventing coolant from circulating properly. If the thermostat is stuck closed, it may need to be replaced.
     
   • Clogged Radiator: A dirty or clogged radiator can restrict airflow and prevent proper cooling. Clean the radiator and remove any debris to ensure efficient cooling.
     

Steps to Troubleshoot and Fix Engine Stalling
When dealing with engine stalling on the Bobcat T190, here’s a systematic approach to troubleshoot and resolve the issue:

1. Check Fuel System:
   • Inspect the fuel filter for any signs of clogs or contamination.
     
   • Check the fuel lines for cracks or leaks.
     
   • Ensure that the fuel tank is free of water or debris.
     
   • Test the fuel pump to ensure it is operating correctly.
     
2. Inspect the Air Intake System:
   • Replace the air filter if it is dirty or clogged.
     
   • Inspect the intake system for leaks or loose connections.
     
   • Clean the intake manifold and throttle body if necessary.
     
3. Evaluate the Electrical System:
   • Test the battery and alternator to ensure they are providing the correct voltage.
     
   • Inspect the ignition system for worn spark plugs or faulty ignition coils.
     
   • Check all relevant sensors, including the throttle position sensor, to ensure they are functioning properly.
     
4. Monitor Engine Temperature:
   • Check the coolant levels and top off if necessary.
     
   • Inspect the thermostat and radiator for proper function.
     
   • If the engine is running hot, allow it to cool down before restarting, and consider addressing any overheating issues.
     

Preventative Measures to Avoid Future Stalling
To keep your Bobcat T190 running smoothly and avoid future stalling issues, consider these preventative maintenance tips:

• Regularly Replace Fuel and Air Filters: Replacing the fuel and air filters at regular intervals ensures optimal engine performance and helps prevent stalling due to fuel or airflow issues.
  
• Check and Maintain the Cooling System: Regularly inspect the coolant levels, thermostat, and radiator to ensure the engine doesn’t overheat.
  
• Clean the Fuel System: Use fuel additives to keep the fuel system clean and prevent the buildup of contaminants that could clog the fuel filter.
  
• Inspect and Clean Sensors: Periodically clean and test the sensors to ensure they are functioning properly and providing accurate data to the ECU.
  

Conclusion
Engine stalling on the Bobcat T190 can be caused by several issues, from fuel and air supply problems to electrical and overheating concerns. By systematically troubleshooting the engine and addressing the underlying causes, you can resolve the issue and get back to work quickly. Regular maintenance, including checking the fuel system, air intake, electrical components, and cooling system, can help prevent stalling in the future. Keeping your equipment in top condition ensures that it runs smoothly and reliably, helping you avoid downtime and increase productivity on the job.