What is a fuel injector balance test?
The fuel injector balance test is a procedure that measures the amount of fuel delivered by each injector. This measurement can be done directly or indirectly depending on the method used.
What does a power balance test tell you?
A cylinder power balance test locates the cylinder causing a lack of power and not contributing to the engine’s balance and performance. The test measures each cylinder’s drop in RPM, testing its effectiveness compared to the others.
What is the maximum allowable variation in pressure drop during an injector balance test?
The difference between the maximum and minimum reading is the pressure drop. Ideally, each injector should drop the same amount when opened. A variation of 1.5 to 2 psi or more is cause for concern.
What engine data do you look at when doing a power balance test?
The principle of power balance testing is to short-circuit the ignition for each cylinder and observe changes in engine speed and vacuum. Using an infrared exhaust analyzer during power balance testing, you also can observe changes in exhaust emissions, as an additional diagnostic aid.
Can you do a power balance test on a single cylinder engine?
Cylinder power balance testing, involves disabling one cylinder at a time, then recording the (rpm). Consequently, you can perform a cylinder power balance test, several different ways.
What is a good injector balance rate?
When viewing the rates, a cylinder with (+) means that its injector is using more fuel than the average fuel rate and a (-) translates to less fuel. GM states that balance rates should be no more than plus or minus 4 (+4/-4) in park at operating temperature.
Can bad injectors cause low fuel pressure?
If one of the fuel injectors is damaged and stuck open, this can cause a low fuel pressure in the rail. You will often notice this by misfire codes on a specific cylinder at the same time.
Can bad fuel injectors cause misfire?
Dirty fuel injectors may cause your vehicle’s engine to misfire. This problem makes the motor feel as though it is sputtering — sending vibrations through the car. Such misfires can happen when a fuel injector problem mixes up the delicate balance between fuel and air entering the engine.