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2011 cruze LS 1.8L chirping!

8731 Views 3 Replies 1 Participant Last post by  barleywilkerson
2011 cruze LS 1.8L chirping! with video and repair. FIXED!

I have the dreaded chirp that all the 1.4L guys are dealing with... :go:

Looks like the PCV valve has failed, and air is getting sucked in around the spark plugs, causing the gaskets to fail at #2 and #3... #2 well was half full of oil and #3 was drenched. You can see left-over oil that i couldn't wipe up all around the recess under the coil cover. MMMM, SEEPAGE!

The little bit of mess will be cleaned up when the replacement cover and gasket are installed... will update in a few days.

Also, car has right around 88,000 miles on it. Bought it used around 10k miles ago. Has already had the belly pan chopped up and is out of warranty... haven't had many problems with it so far except for a coil failure which led to a spectacular bout of privately-owned-professional-auto-shop dislike and a loss of money due to necessity of speedy repairs and greedy bastards, but that's another post for another day...
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forgot to mention that code p013b and p0171 were both thrown when CEL came on, along with TC and Stabilicrap... both codes are intake related...

P013b -CHEVROLET - HO2S Slow Response Lean to Rich Bank 1 Sensor 2

Possible causes - Faulty Heated Oxygen Bank 1 Sensor 2 - Heated Oxygen Bank 1 Sensor 2 harness is open or shorted - Heated Oxygen Bank 1 Sensor 2 circuit poor electrical connection - Inappropriate fuel pressure - Faulty fuel injectors - Intake air leaks may be faulty - Exhaust gas leaks

Read more: P013B CHEVROLET HO2S Slow Response Lean to Rich Bank 1 Sensor 2

P0171 - CHEVROLET - Fuel Trim System Lean Bank 1

CHEVROLET - Fuel Trim System Lean Bank 1

Read more:

Possible causes
Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection
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New cover goes on easy!

New cover and gasket ordered through amazon. The gasket is pretty thick and pliable material, clean, and in good condition as expected.
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The old cover and gasket with 88,000 miles of hardening, brittleness, and some cracks. My best guess is that the camshaft cover center bolt was over-tightened during PO/dealer maintenance, first, then coil pack bolts were also over-tightened at some point, with engine still hot, causing the gasket to deform and "flatten" beyond its sealing capability. This gasket was almost as hard as the cover, brittle, and so flat around the center bolt and #2 & #3 spark plugs that i think it would have failed whether the PCV valve was good or bad.
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Shot of what's under the cover... camshafts and stuff! Little bit of crud on the driver's side, but pretty clean in general. 2 and 3 spark plug wells are discolored from oil leaking through.
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repair complete and no more chirps! Also, looks so much cleaner since any crap got wiped up.

Everything fit like it should and there were no issues installing. If you don't have a #30 torx socket, 8mm is close enough to get the job done without screwing anything up. You do not have to remove the harness to do this if you are careful. Just unplug the few obvious connectors to get some slack. Remove the plastic pipe from PCV to intake and don't lose the spring clips. Remove old cover and gasket, cleanup surfaces and install new cover and gasket. Put the pipe back on without losing the clips! Plug stuff back in and start the car. Chirps are gone! Clear your codes and enjoy the silence.
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i think tomorrow i'm going to try and remove the PCV valve unit from the old cover and see what i can see. Looks like it IS potentially removable, if i can spread the plastic clips without breaking anything. I wonder if they were made this way just for ease of assembly, or if there was a plan at some point to make the PCV valve itself replaceable? Either way i'm curious to see the inside and find out if it is actually damaged...
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