How to Troubleshoot Chevy Fuel Injector Problems

by Alibaster Smith

Clean fuel injectors are a must if you want to have good fuel efficiency. The fuel injector in a Chevy is responsible for metering the fuel that enters the intake manifold, and ultimately the engine. If your fuel injectors are dirty or are leaking, you'll notice decreased performance, increased fuel consumption, and your engine may not run at all in extreme cases. If you are having trouble, you'll need to know how to troubleshoot Chevy fuel injector problems.

Step 1

Turn the Chevy on. Idle the engine.

Step 2

Unplug the electrical connector on each injector on the fuel rail (located in the front of the engine) one at a time. Make note of the idle speed. Then, reconnect the electrical connector. Do this for each injector and if you notice that the drop in idle speed is roughly the same for each injector, then they are operating normally. If the idle speed does not drop when you unplug one of the injectors, then that injector may be faulty.

Step 3

Check the voltage of the connector. Set the voltmeter to Volts. With the engine still running, unplug each injector one at a time. Note the electrical contacts on the injector and the connector. Place the red lead on one of the connector (not the injector) contacts and the black lead on the other contact. If you get a reading of between 1 and 2 volts, then the connector is working fine.

Step 4

Check each injector's resistance through the electrical connector with a voltmeter. Turn off the engine. Set your voltmeter to the Ohms (Ω) setting. This will test the resistance across the connector. Pull the connector off the injectors one at a time and place the red lead on one of the electrical contacts on the injector itself. Place the black lead on the other contact. If all injectors show the same or similar resistance, then the injectors are working properly and the suspect injector in step one may actually have a faulty electrical wire/connection.

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