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13 Cruze 1.4L turbo LEAN CODES

  • Wood
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27 Feb 2019 21:06 #27452 by Wood
13 Cruze 1.4L turbo LEAN CODES was created by Wood
Looking over my buddies Chevy Cruze because he took it to the dealership and they saw lean codes and wanted to start throwing fuel system parts at it.

Freeze frame indicates the code set at Idle. I pulled up LTFT, STFT, upstream and downstream O2 sensors. At idle LTFT & STFT were both at 35%. Snap the throttle and the upstream O2 pegs rich ruling out fuel pressure and MAF right? Increase rpm and fuel trims start to drop. Indicating a vacuum leak.

It seems the PCV valve is built into the valve cover on this model. I have heard of these having issues. When I plug the hole on the PCV valve the fuel trims start to correct, but they’re still high. My question is.....do I pull the trigger on the valve cover and keep troubleshooting after that? Or are is there something else I’m over looking. What’s the call here?

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28 Feb 2019 06:19 #27457 by Doc n2mx
Replied by Doc n2mx on topic 13 Cruze 1.4L turbo LEAN CODES
Hi
If you can use a smoke machine I would smoke the engine to see if you have any other leaks.

Doc

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28 Feb 2019 08:35 #27461 by Chad
Replied by Chad on topic 13 Cruze 1.4L turbo LEAN CODES



"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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28 Feb 2019 09:27 #27462 by Noah
Replied by Noah on topic 13 Cruze 1.4L turbo LEAN CODES
Tyler saved my bacon on one those a while back. The cause of the PCV diaphragm failure is the lack of a little rubber metering device in the intake manifold.
There's a 3/8ths diameter port between the #2 and #3 intake runners. If you pop the hose off and look straight down the hole, you should be able to see the tip of a little orange rubber cone poking horizontally into the chamber from the engine side toward the firewall.
If the cone is gone, she'll keep eating valve covers.... Stupid IMO.
VC was around $100
Intake $500ish, loaded. Fuel rail, injectors, TB, etc...

"Learn, apply, repeat."
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01 Mar 2019 10:24 #27488 by Tyler
Replied by Tyler on topic 13 Cruze 1.4L turbo LEAN CODES
Noah called it. :cheer: The failure of the Non-Return Valve in the intake causes the failure of the valve cover. If left that way for too long, it can also cause piston ring land damage. The newest version of this GM PIP includes pictures of what to look for:

File Attachment:

File Name: PIP5197H.pdf
File Size:269 KB


Notice that it's on version 'H'. :lol:

I found out recently that GM now sells the intakes bare, thankfully! Just gotta transfer fuel parts and the throttle body.
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03 Mar 2019 02:37 #27542 by Wood
Replied by Wood on topic 13 Cruze 1.4L turbo LEAN CODES
I don’t know why I haven’t been getting notifications for this post but I just read all of your responses. Thanks for all the information. I’ll definitely check out that PIP and do my research. I did hear somewhere that the valve cover is the effect and not the root cause. I don’t quite understand what the valve is in the intake, how it works, or what the effect is on the valve cover. But I will read up on it and educate myself. Unfortunately I think the car has been running this way for a while now. I pulled the oil cap and there is a LOT of blow by, seems as if the ring lands are already damaged. Is it worth the trouble of putting new intake or valve cover on it (after troubleshooting it more of course)? Or has the damage already been done. The car only has 100k on it.
Does you guys have any solid material I can read up on too understand this system better? Why is it that it destroys the pistons? Engine runs too lean and burns up the ring lands? Thanks again for all the help and support.

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03 Mar 2019 10:29 #27546 by Tyler
Replied by Tyler on topic 13 Cruze 1.4L turbo LEAN CODES
I'm no engineer, but I cal tell you what I've seen from experience.

It's my understanding that the non return valve is there to allow normal PCV system operation off boost, but block boost pressure from going into the crankcase when boosting. That's important so you don't blow out seals and such. :lol:

When the non return valve breaks, it allows full manifold vacuum and boost pressure into the crankcase. That causes the sensitive diaphragm in the valve cover to pop, and also explains why you found vacuum at that port in the valve cover.

Again, not an engineer, but I've been told that a result of the extreme pressures in the crankcase causes the pistons to 'flutter' and break ring lands. Did I mention I'm not an engineer? :silly: Just what I've been told.
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03 Mar 2019 21:05 #27574 by Wood
Replied by Wood on topic 13 Cruze 1.4L turbo LEAN CODES
That makes sense, I was wondering with it having a turbo if that valve had anything to do with boost pressure. I read over that PIP. I think I'll check the intake for that valve and then maybe do a compression test before replacing any parts.

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08 Mar 2019 21:23 #27674 by Tyler
Replied by Tyler on topic 13 Cruze 1.4L turbo LEAN CODES
Bump! Saw a '15 Trax with the exact same issue. Found out while sourcing parts that GM has an extended warranty for this issue. :blink:

Might give your local dealer a call and see what they have to say. Worst case, they say no.

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