Freightliner trucks are known for their reliability, but even these workhorses can experience starting issues. While “Freightliner Code Bh 164” isn’t a standard fault code displayed on the dash, it likely refers to a broader problem related to hard starting or no-start conditions. This article explores potential causes and troubleshooting steps for Freightliner trucks exhibiting these symptoms, especially focusing on fuel system related issues.
Common Causes of Hard Starting in Freightliner Trucks
A Freightliner that struggles to start can stem from various issues, often related to the fuel system. While the ABS and engine lights might illuminate, providing specific fault codes through the dash is crucial for accurate diagnosis. If no codes appear, consider these common culprits:
Fuel Filter Problems
The fuel filter is a prime suspect in hard starting scenarios. Ensure you’re using genuine Detroit Diesel/Mercedes parts for optimal performance. Check for both the primary fuel filter and the strainer, ensuring both are clean and replaced as needed. Additionally, some Freightliner models, especially older Business Class trucks, might have a hidden inline fuel filter within the plastic fuel line under the cab. Locate and replace or remove this filter.
Fuel System Contamination
Debris or contamination within the fuel system can impede fuel flow and hinder starting. Inspect the check valve/quick release couplings on the fuel filter housing. Disconnect the fuel lines by unscrewing the elbow fittings beneath the bowl and examine the quick release fittings for any signs of blockage. This procedure is typically applicable to pre-2007 engines.
Air in the Fuel System
Air intrusion in the fuel lines can disrupt fuel delivery to the engine. To check for this, disconnect the return line on the engine and route it into a container. Run the engine briefly and observe the returned fuel for air bubbles. Consistent bubbling indicates an air leak in the supply side.
Fuel Leaks and High-Pressure Pipes
Fuel leaks, especially in the high-pressure fuel lines on the driver’s side of the engine, can result in difficult starting. Thoroughly inspect these lines for any signs of leakage. While less frequent, injector issues can also contribute to fuel loss.
Electrical Issues Affecting the ECM
In rare cases, faulty batteries, cables, or wiring connected to the Engine Control Module (ECM) can prevent sufficient power delivery, causing starting problems. This can manifest as intermittent starting issues, where the engine might crank but not fire until the starter load is reduced (e.g., using ether).
Troubleshooting Tips and Conclusion
When your Freightliner experiences hard starting, systematic troubleshooting is key. Start by retrieving any available fault codes from the dash. If no codes are present, focus on the fuel system components. Inspect and replace fuel filters, ensuring genuine parts are used. Check for hidden inline filters, fuel system contamination, and air in the fuel lines. Examine high-pressure fuel lines for leaks. Finally, don’t overlook potential electrical issues affecting the ECM.
By methodically addressing these potential problems, you can significantly improve your chances of resolving hard starting issues in your Freightliner truck. If problems persist after these checks, consult a qualified Freightliner technician for further diagnosis and repair.
