Chevrolet Tahoe:

Injector not pulsing

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# 1  1/21/2012 4:52 PM

tuck
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Registered: 1/21/2012
Posts: 3

Injector not pulsing

Put a new fuel pump, fuel psi regulator, crank sensor, cam sensor  still not pulsing injector too run in a Vortec V 8 engine.  smile

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# 2  1/21/2012 7:30 PM

Administrator
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Registered: 9/27/2008
Posts: 1281

Re: Injector not pulsing

You said it's "not pulsing injectors". You need to have 12volts at 1 terminal of the injector, and an "on and off/pulsing ground" from the PCM at the other. The best way to test this is with a special tool called a "noid" light. Plug it in, crank the engine, and the light should flash. If not, you're missing the 12volts, or the pulsing ground from the PCM.

But there may be other problems. Replacing the fuel pump doesn't necessarily mean you now have fuel pressure. It may be an electrical problem in the circuits powering the pump.

The basics are this: check for spark at the plugs, check for correct fuel pressure, check for pulse at the injectors. This will typically lead you in the right direction.


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# 3  1/21/2012 11:38 PM

tuck
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Registered: 1/21/2012
Posts: 3

Re: Injector not pulsing

Okay got all that its the Vortec 5.7 with the spider injector.

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