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Have 92 Chevy G20 no injector pulse check engine light has 12 volt at and bulb but ground why?

There are a few possible reasons why your 1992 Chevy G20 might not have injector pulse and have a check engine light with 12 volts at the bulb but no ground. Here are a few things to check:

- Fuel injector relay: Check the fuel injector relay for continuity. If it's not working, replace it.

- ECM: Check the ECM for any error codes. If there are any, diagnose and repair the problem accordingly.

- Wiring: Check the wiring between the ECM, fuel injector driver module, and fuel injectors. If you find any damage, repair or replace the affected wiring.

- Ground connection: Check the ground connection between the ECM and the battery. If it's not tight, clean the connection and make sure it's tight.

- ECU: Check the ECU for any signs of damage. If the ECU is damaged, it will need to be replaced.

If you've checked all of the above and still can't find the source of the problem, it's best to take your car to a qualified mechanic for further diagnosis.

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