Gmc envoy

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Joined: Fri Apr 06, 2018 6:35 am

Gmc envoy

Unread post by Dwhid64 » Fri Apr 06, 2018 6:39 am

Check engine light on its reading misfire on cylinder2 i tried everything pretty much,new plugs new coil pack new injectors, dont know wat else it could be please help thx.

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Re: Gmc envoy

Unread post by carriedi » Fri Apr 06, 2018 9:34 am

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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