Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
ok. I am giving you these flow charts and diagrams ,this will help you find the problem ....guy...
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CHART A-3 - ENGINE CRANKS BUT WILL NOT RUN
This chart assumes that battery condition and engine cranking speed are OK, and there is adequate fuel in the tank. This chart should be used on engines using the Model 700 throttle body.
If no trouble is found in the fuel pump circuit or ignition system and the cause of a "Engine Cranks But Will Not Run" has not been found, check for:
The "Scan" tool does not have any ability to help diagnose a ignition system check.
whats weird is you have spark ,fuel and when you prime it ,it runs ,you have bat voltage on one side of the injector but no ground source ,which comes from the pcm/ecm,I have a flow chart for the injector ,follow that ,also check the wire from the ground side of the injector to the ecm (blue wire)also check the voltages and grounds going into the ecm as well as D16 injector ground side to the injector to see if you have a ground pulse while it is running or cranking,,did you change over the prom in the ecm to the new ecm?...guy,does the truck run good ?