When there’s an issue with your Cobalt Fuel Injector, your Chevy engine will idle rough and lose power. Over time contaminants in your fuel that get past your fuel filter will clog or damage your fuel injectors. Your Chevy injector can also fail internally, so there’s a few ways your Cobalt Fuel Injector can go bad.
Today I’ll be showing you how to test a Cobalt Fuel Injector in a 2010 Chevy with a 2.2 liter Ecotec engine in it. If you suspect your injectors are the culprit, you’ll need to use a digital multimeter to complete this guide.
Whether your fuel injector has clogged or it’s failed, you’ll need a replacement if your injectors truly have gone bad. This guide will show you how to test your Cobalt Fuel Injector and locate the bad one.
Whenever your Cobalt Fuel Injector has an issue or fails, you’ll have a few common symptoms. Here’s just a few of the issues you’ll see in your 2.2 liter Ecotec engine below.
Symptoms of a failed Cobalt Fuel Injector
- Poor idle
- Inconsistent engine performance
- Hesistation
- Engine misfire
- Check Engine Light ON
When the check engine light in your Chevy turns on, you’ll need to use a OBDII scan tool to retrieve the code. If it’s a misfire code, hopefully the code will determine or tell you which cylinder is misfiring.
Testing your Cobalt Fuel Injector
In order to test the bad fuel injector, you’ll be using a digital multimeter to measure the internal resistance. But if you want to do this you’ll need to use engine balancing measures to find the bad cylinder.
Load balancing is an easy test to perform, especially because you own a 4 cylinder. It involves starting your engine, and unplugging each injector one at a time. When you unplug your injector your engine should severely stumble and almost turn off. When you find one that doesn’t cause your idle to stumble or has the least amount of effect on how your engine is running, chances are that’s the culprit.
Now that you’ve located the problem injector, you can use your multimeter to test the function. If you aren’t sure what a multimeter is, see our guide here on this tool to measure voltage.
Unplug the problem injector and you’ll be probing each one of the terminals with the multimeter. Turn your device to read resistance (OHMS) and put your leads on PIN A and PIN B to read the internal resistance of your Cobalt Fuel Injector.
The factory reading or internal resistance of a properly working fuel injector is 11 to 14 Ohms (Ω). If your Cobalt Fuel Injector reads outside of this value, it’s time for a replacement injector.
Once you’ve replaced your faulty injector you can use any OBDII scan tool to properly clear and erase your Cobalt check engine code. Have any questions about our Cobalt Fuel Injector How To Guide? Leave them for us below and let us know!
