I have a 2010 2.4L ecotec p0172 code. When I did the injector balance test using my Tech 2 scanner. The pressure dropped from 52psi to 12 psi for each injector. That seems awful high pressure drop. I know the specs for a 2.2L ecotec for a good injector is between 9 to 11 psi. You can also email the answer spenser46 @ c o m c a s t . n e t. Just take the spaces out. Thanks