It is advisable to take your heavy goods truck for extensive inspection and diagnosis before any repairs are done to fix a problem which you have been experiencing. Such an approach will save you from spending money on truck parts which may not have been responsible for the defect. Below are some of the possible reasons why your truck may not be accelerating satisfactorily.
Faulty Fuel Pump
Your truck could have a defective fuel pump. Such a pump can fail to pump fuel at the right pressure in order for combustion to take place within the engine. Consequently, the engine will not generate sufficient energy to propel the loaded truck. Replacing the fuel pump can fix the problem.
Defective Pressure Regulator
The fuel pressure regulator could also be responsible for the poor acceleration which you are experiencing. Fuel should enter the engine at a certain set pressure to mix with air before combustion can take place. Any fault which prevents the pressure regulator from working correctly can prevent the truck from accelerating as expected.
Dirty Fuel Injectors
Clogged or dirty fuel injectors affect the efficient delivery of fuel into the combustion chambers in the engine. For example, excessive or limited amounts of fuel may be getting into the engine. The engine can then run lean (too little fuel) or rich (too much fuel). Either extreme will affect how well the truck can accelerate. Cleaning or replacing the injectors can correct the situation.
Exhaust Back Pressure
Excessive back pressure prevents the combustion chamber from emptying or getting rid of all exhaust gases to make room for fresh fuel and air. Less energy will, therefore, be generated if the exhaust back pressure isn't restored to the correct level since exhaust gases will keep being recycled during each combustion cycle.
Vehicles now rely on multiple electrical systems to function when compared to previous generations of vehicles. Those computerised systems rely on several sensors, such as the mass airflow sensor and the throttle position sensor. Faulty sensors provide inaccurate or no data upon which control modules can function. Tests must, therefore, be done to identify the particular sensor which has failed so that your truck can be repaired.
As such, you should not assume that a given part needs to be replaced just because earlier repairs of similar symptoms identified that part as the cause of the problem. Numerous problems can exhibit similar symptoms. Find a mechanic and let the professional make a correct diagnosis before you buy any truck replacement parts. Contact a company that sells Isuzu truck parts for additional information.