Gmc envoy
Re: Gmc envoy
if the p0302 is the only code and you have done the plug, coil and injector you should look and compare to a known good cylinder, what the electrical wave forms look like. If the injector looks like another injector and the coil looks like another coil then you may have a mechanical problem with that cylinder. you may want to do a cylinder leakdown test and see if your valves are fully closing.
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