Car came in needing a new valve cover due to stuck pcv. After repair and resetting fuel trims I noticed the trims started increasing again. The purge solenoid was working at about 12% which I thought was odd. P0171 set again. Turn off and start again, after about 60 seconds it starts to purge, adds fuel, sets code, and vent stays open. I find a lot of info on the web for bad purge valves on these and p0496 with folks replacing the valves and claiming to fix the problem. I can unplug the valve and install a noid light and see that it is being commanded on so I cant blame it on the valve. I plugged the port on the intake and trims go 0-2%. I looked for a new calibration for this and found nothing. Anybody ran into this before or have any thoughts on direction?
2012 cruze 1.4 constant evap purging
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Car came in needing a new valve cover due to stuck pcv. After repair and resetting fuel trims I noticed the trims started increasing again. The purge solenoid was working at about 12% which I thought was odd. P0171 set again. Turn off and start again, after about 60 seconds it starts to purge, adds fuel, sets code, and vent stays open. I find a lot of info on the web for bad purge valves on these and p0496 with folks replacing the valves and claiming to fix the problem. I can unplug the valve and install a noid light and see that it is being commanded on so I cant blame it on the valve. I plugged the port on the intake and trims go 0-2%. I looked for a new calibration for this and found nothing. Anybody ran into this before or have any thoughts on direction?
There is also trouble with the PCV hose (from intake to turbo inlet) and the anti return valve in the intake for the PCV system. There is a TSB for it. I'll try to find it.Comment
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Just for future reference, the vent valve is typically always open anyway. Closes for leak testing, not purging.Comment
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