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BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17368
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Have a chevy that is giving us 2 codes po442 and po496, we

Customer Question

Have a chevy that is giving us 2 codes po442 and po496, we put a purge vale on this a month go and everything was fine but now it misses at idle and when you release fuel cap it has pressure. Can you help us out here Thanks
Submitted: 1 year ago.
Category: Chevy
Expert:  BOBBYSS replied 1 year ago.

Hello, my name is***** for the question. It is possible that you got a bad purge valve. Most of the time though this is caused by a vacuum leak in the intake manifold. This will cause the purge flow to be off. As for the tank. It is normal to have pressure in there until the system purges off idle.