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gmc envoy_slt
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Discussion Starter · #1 ·
Hello you guys!

I'm helping my dad fix his 2005 Envoy as it has failed emissions 4x. This is the model that isn't a 4WD.

Due to the first round of codes we replaced the O2 sensors, all the cylinders in the engine, and replaced the head gaskets. Still failed emissions. Check engine light still on. Now we still have the P0442 EVAP Emission Leak (Small) and the P0455 Evaporative Emission Gross Leak Error. We've gotten another gas cap, got the replacement Solenoid Purge Valve and the Canister that is used for the P0440 code. STILL having problems.

Does anybody know what else could still be the matter?
 

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2007 chevy trailblazer_ls
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343 Posts
Uh, you have a large leak somewhere between the gas tank and the engine. A smoke test will find it. Or you could just keep throwing parts at it.
 
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