Question about 1999 Chevrolet Silverado 1500
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Posted on Jan 02, 2017
P0135 is a bad 02 sensor
P0442 is a evap problem
P0449 is a vent solenoid
i would check the vent solenoid first its a 4ws fuse under the hood in the fuse box make sure you have power to it you should have power at all times the ground comes from the pcm i think if you fix this everything else will work they are all computer controled
Posted on Mar 23, 2009
purge valve happens, but it's more on the rare side. The most common you have already fixed. I've seen the cross pipe between the two fuel tanks leak and also the lines on top of either tank and the evap line going from the tank to the engine. Also you should check the vent valve (the more I think about it the more I'd lean tword a vent valve). Now to get to that the car needs to be up in the air. You cannot get to it unless you get it up or you are really really skiny.
Posted on Jan 10, 2010
Testimonial: "I don't know as of yet if this will fix my po442 problem but it does send me in a new direction. Thank you"
SOURCE: po442 code 1999 chevy lumina
Code P0442: EVAP Emission Control System Leak (Small)
This may be caused by something as simple as a failed gas cap; if the gasket is no longer tight, you may be sucking in air.
Posted on Oct 17, 2010
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