Question about Dual Milwaukee 6950-20 12" Bevel Compound Miter Saw

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The rpm of the motor seems to flutter and run uneven making a cut or not. If it were a carb, I'd say it was getting dirty fuel.

Brand new today

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What year make model and engine size do you have??

Aside of the pressure regulator that may be bad, you may have an injector that is leaky, or one of the O-rings on the fuel rail , most vehicles that I test will hold pressure over night into the next day without losing any measurable pressure
if you relieve the pressure and then cycle the pump the full pressure should be reached in no more than 1 second, longer than that, or if it takes a few seconds you may need a fuel filter, when the vehicle sits and the pressure lowers between the pump and the regulator, as soon as you go to start the engine the injectors open and the pressure drops momentarily near to nothing and the pump takes several seconds to push the fuel back through the filter, this takes a few seconds all the while the injectors are still opening, so the engine takes longer to start up..
Note: if the engine is running a bit to warm, when you turn off your engine the heat causes the cool, no longer circulating fuel to heat up and expand forcing the fuel back to the tank, (vapor lock) this is only momentary because of the way the pump circulates the fuel back to the tank, but it causes the engine to take longer to start.
the currant to the injectors can only be tested with an AC meter because the voltage though DC current, is a pulsating DC, it pulses each time the ECM tells it to open, if they all were powered just turning the key on they would over heat and burn up in just a few seconds,
some cars have grounded injector harnesses that the computer sends positive current to the injectors through one wire while the other is simply grounded, others have positive current applied at all times and the computer grounds the other wire momentarily in order to operate the injector, so each wire has to be tested both ways, one to check the resistance to ground and the other to test positive voltage.
the most common reasons for the loss of injector errors are
1, a shorted injector, (this caused all the other injectors to stop working or work very inefficiently)
2, the cam sensor (the ECM uses this as a reference in timing the injectors in conjunction with the ICM)
3, the lack of fuel pressure to them (all the many things that can cause this condition)
4, a bad ignition control module ( the computer uses the signals from ICM for a reference to time the injectors as it monitors and changes the ignition timing)
5, a bad crankshaft position sensor ( the ICM is using this to set the ignition timing and to send the reference signal to the ECM)

Posted on Mar 29, 2015

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