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Old 11-28-2017, 11:33 AM
STURNER STURNER is offline
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Default 2012 cruze 1.4 constant evap purging

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?
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Old 11-28-2017, 01:18 PM
Witsend Witsend is offline
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Maybe the Canister Vent valve back at the canister is just hung wide open and your just still pulling air through the lines after the fumes have already been long vented?
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Old 11-28-2017, 02:55 PM
BRIAN617 BRIAN617 is offline
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Quote:
Originally Posted by STURNER View Post
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?
12% Purge at idle is normal, problem is the sticky valves. I've noticed when commanded through their DC% range they stick wide open even though the duty cycle changes.

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.
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Old 11-28-2017, 03:15 PM
BRIAN617 BRIAN617 is offline
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https://www.iatn.net/forums/13/53406...cruze-or-sonic
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Old 11-28-2017, 04:14 PM
Witsend Witsend is offline
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Sounds like another thousand dollar problem on a five hundred dollar car. First a new valve cover and then if you don't see a little orange tit through a peep hole it will need a new intake.
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Old 11-28-2017, 04:21 PM
STURNER STURNER is offline
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Thanks a lot. That's a great piece of information.
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Old 11-28-2017, 07:56 PM
crackerclicker crackerclicker is offline
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Quote:
Originally Posted by Witsend View Post
Maybe the Canister Vent valve back at the canister is just hung wide open and your just still pulling air through the lines after the fumes have already been long vented?
Hi Wits,

Just for future reference, the vent valve is typically always open anyway. Closes for leak testing, not purging.
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