Read on to learn about some of the problems people encounter with diesel engines and how they can be addressed by the professionals at Bridwell Auto Center!
Diesel Won’t Start Problems
- Air leaks – vacuum in fuel supply
- Blocked fuel supply – filters
- Cam – crank sensor
- Diesel injector/s bad
- Faulty pressure regulator – sensor
- Flat batter – low cranking speed
- Fuel contamination
- Glow plugs or relay fault in glow plug
- High pressure pump bad
- Internal engine problems
- Low compression
- Low fuel pressure
- Low pressure supply pump-faulty
- Not enough fuel supply
Hard To Start Diesel Engine Problems
- Air leaks – vacuum in fuel supply
- Bad pressure regulator – sensor
- Blocked fuel supply – filters
- Cam – crank sensor
- Diesel injector/s bad
- Flat batter – low cranking speed
- Fuel contamination
- Glow plugs or relay fault in glow plug
- High pressure pump bad
- Internal engine problems
- Low compression
- Low fuel pressure
- Low pressure supply pump bad
- Not enough fuel supply
Diesel Runs rough at lower RPM Problems
- Air leaks – vacuum in fuel supply
- Air intake restriction
- Bad pressure regulator – sensor
- Blocked fuel supply – filters
- Cam – crank sensor
- Diesel injector/s bad
- Fuel contamination
- High pressure pump bad
- Injector blow-by seat leaking
- Injector wiring harness bad
- Internal engine problems
- Low fuel pressure
- Low pressure supply pump bad
- Not enough fuel supply
Lack Of Diesel Engine Power Problems
- Air leaks – vacuum in fuel supply
- Air intake restriction
- Bad pressure regulator – sensor
- Blocked fuel supply – filters
- Diesel injector/s bad
- EGR problems
- Fuel contamination
- High pressure pump bad
- Injector blow-by seat leaking
- Internal engine problems
- Low fuel pressure
- Low pressure supply pump bad
- Not enough fuel supply
- Turbo problems – waste gate
Diesel Engine Knocking or Pinging Problems
- Blocked fuel supply – filters
- Cam – crank sensor
- Diesel injector/s bad
- Fuel contamination
- Injector blow-by seat leaking
- Injector wiring harness bad
Black Smoke From Exhaust Problems
- Air intake restriction
- Cam – crank sensor
- Diesel injector/s bad
- EGR problems
- High pressure pump bad
- Injector blow-by seat leaking
- Injector wiring harness bad
- Low fuel pressure
- Turbo problems – waste gate
White Smoke From Exhaust Problems
- Cam – crank sensor
- Diesel injector/s bad
- EGR problems
- Fuel contamination
- Glow plugs or relay fault in glow plug
- Injector wiring harness bad
- Low compression
- Low fuel pressure
- Turbo problems – waste gate
Blue Smoke From Exhaust Problems
- Internal engine problems
- Turbo problems – waste gate
Air Leaks In Vacuum Supply
Air leaks allow air to enter the fuel system through connections, fuel lines, fuel system and primary filter. Most leaks are spotted between the engine lift pump and filter inlet. When the diesel engine is running correctly it creates a vacuum to pull fuel through the engines filter. When the filter clogs the vacuum will increase. This will lead to engine shutting down if it doesn’t have a self bleeding system. Use a vacuum gage to perform a test.
Low Compression
Low compression in your diesel engine will prevent heat from being produced to ignite fuel and causes hard starting. This is usually a problem with high mileage or older diesel vehicles. To troubleshoot whether low compression is the problem or not, perform a cold engine compression test. Engine compression should be around 20-35 bars or 300-500 psi. If compression is below these numbers it will start causing problems.
Low Fuel Pressure
Low fuel pressure is usually created by poor fuel supply to pump/injectors/rail or the injectors/rail are not holding fuel correctly in the system. A great way to diagnose low fuel pressure is to begin with the tank and make sure that enough fuel is available to the pump. Also make sure the pump is still delivering fuel. Loosen supply pump from rail to pump. Check you fuel delivery.
Bridwell Automotive Offers Full Auto Repair Services In Scottsdale, Arizona
Our dedicated team of ASE Master Technicians will help you repair your car quickly and within your budget. You can schedule your car repair with Bridwell Automotive Center in Scottsdale by using our contact form. Stop by our Auto Repair Shop located at 7171 E Lincoln Dr. Scottsdale, Arizona 85253 or by giving Bridwell Automotive Center a call today (480) 948-4781.
