4.3 Vortec - No voltage at injectors

Apr 04, 2004 6 Replies
H

Replacement engine in '98 Blazer. Old engine ran on this ECM, so the ECM is believed to be OK. Fuel pressure is 55 PSI.



Everything appears fine except that I am not getting any voltage at the injectors to make them pulse. The engine will fire when primed manually, but the injectors are not delivering fuel, so it's a short run.



All wiring and harnesses were reconnected as before. I do not have a manual, so I don't know what I should be looking for here. What's keeping the injectors from getting the electrical pulses?



Any help is appreciated.


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C

injectors to make them pulse.

delivering fuel, so it's a short run.

manual, so I don't know what I should be looking

Where did the replacemnt motor come from? Is it new or used? Do you still have the old motor? What parts did you transfer from old to new? Charles

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K

Check your grounds, especially for the ECM - as well as fusible links. The ECM controls the injectors by grounding them IIRC. I can't tell you any specifics of which wires to check, but this might get the wheels turning and you can then figure it out from there.

HTH

~KJ~

injectors to make them pulse.

delivering fuel, so it's a short run.

manual, so I don't know what I should be looking

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W

Sounds like it is time to get a manual. Try your local library or go to Helminc.com.

on the hot side.

and possibly figure out which wire could be

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N

on the hot side.

and possibly figure out which wire could be

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