How to fix PCV freezing issue - DIY Solutions? - EquinoxForum.net: Chevy Equinox Forum
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post #1 of 20 (permalink) Old 01-31-2017, 12:45 PM Thread Starter
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How to fix PCV freezing issue - DIY Solutions?

I've searched the forum but can't seem to find the answer, apologies if I am not looking in the correct place.

2012 Equinox 2.4, 134,000 miles. Rear main seal failure, repaired at shop, 2nd failure 800 miles later. Shop replacing 2nd seal under warranty now. The shop says that replacing valve cover and associated pcv tubing will solve the problem ($800). I can't seem to find any supporting information that this will fix the issue. I have read about catch-can installations and drilling out intake orifice to a larger size. Will this fix the issue? If so is there a someone who has done this with a step by step guide to the the size to drill it out to, increased tubing size, etc? I am 100% comfortable in doing the work on the top end of the engine, but there doesn't seem to be an apparent fix that is universally used. My shop will not warranty the next rear main unless I replace the valve cover, so I am hoping to find some answers from the shade-tree mechanics and the experts out there! Thank you for for taking the time to read a noob post; I look forward to the replies or at least a link to a post that addresses this!

BTW - I'm in North Dakota - first failure was in negative temps, second was around 20 degrees, after driving approx 20 miles at hwy speeds.
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post #2 of 20 (permalink) Old 01-31-2017, 01:00 PM
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Re: How to fix PCV freezing issue - DIY Solutions?

Here is one good article, notice the Special Coverage Adjustment includes the 2014 model year.
Additional info on pages 2-6, pics on page 2.


http://gm.oemdtc.com/1899/14882-spec...-chevrolet-gmc

2014 Equinox LTZ FWD 3.6L. V-6 (LFX)
GM6T70 Transmission-Gen II(M7W)
Crystal Red Tintcoat-Brownstone Leather-(FE2) Suspension-18" Wheels
Build Date: Nov. 04, 2013-Delivery Date: Nov. 25, 2013
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post #3 of 20 (permalink) Old 01-31-2017, 01:01 PM
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Re: How to fix PCV freezing issue - DIY Solutions?

hi , and welcome ,


Document ID: 4374709
--------------------------------------------------------------------------------

#PIP5093B: Oil Leak from Rear of Engine After Extended Driving in Cold Temperatures Below 0 F (-18 C) - (Jan 22, 2016)
Subject: Oil Leak from Rear of Engine After Extended Driving in Cold Temperatures Below 0 F (-18 C)

Models: 2010-2014 Buick Lacrosse
2011-2014 Buick Regal
2012-2014 Buick Verano
2012-2014 Chevrolet Captiva Sport
2010-2014 Chevrolet Equinox
2010-2013 Chevrolet Malibu
2010-2014 GMC Terrain
with 2.4L Engine (RPO LAF, LEA or LUK)

--------------------------------------------------------------------------------

This PI was superseded to update Models and Model Years. Please discard PIP5093A.


--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern
Some customers may complain of an engine oil leak that appeared as they were driving the vehicle in extremely cold ambient temperatures (Generally 0 F / -17 C or Colder). They may also comment that they heard a single "pop" noise right before the oil leak started. Upon inspection, the technician will find that the oil leak is coming from the rear main oil seal of the engine as shown below. This may be the result of a frozen PCV system and excessive crankcase pressure. If a leaking rear main oil seal is found in warmer climates, this PI does not apply.

Object ID: 3282971Click here for detailed picture of the image.

Recommendation/Instructions
If this concern is experienced, determine if the concern is the result of a frozen PCV system by inspecting the PCV system, dipstick, and engine oil fill cap for signs of ice, moisture, and/or sludge build up. If this is not due to a frozen PCV system, follow Service Information Procedures to diagnose and repair. If this is the result of a frozen PCV system, follow the steps below:

 1. Check for proper thermostat operation by following Thermostat Diagnosis as outlined in SI and replace the thermostat as necessary.
 2. Remove the cam cover, inspect the PCV baffle inside, and replace the cam cover if obvious sludge build up is present.
 3. Clean any ice/sludge/water/carbon out of the PCV pipes/hoses, the PCV nipple on the cam cover, the PCV orifice between the #2 and #3 intake runners (use a 1/16 inch drill bit as illustrated below), PCV orifice in the head as illustrated below and the throttle body. Also inspect the related PCV hoses/connections for potential damage and replace if necessary.
 4. Allow the engine to idle at operating temperature for at least 15 minutes, turn the engine off, and drain the engine oil for at least 15 minutes to remove all oil and condensation/water from the crankcase.
 5. Follow SI repair procedures to repair any oil leaks that were induced as a result of the frozen PCV system and excessive crankcase pressure.
 6. Clean any oil residue left under the vehicle from the original oil leak.
 7. Replace the oil filter and fill the crankcase with engine oil. In the future, the customer may want to consider changing their engine oil right before winter starts in order to prepare for the colder weather.
 8. To complete the repairs, ensure that the latest ECM calibrations have been installed to adjust the engine oil life monitor to a maximum of 7,500 miles (12,070 KM) as well.
Object ID: 3704956Click here for detailed picture of the image.

Object ID: 3704955Click here for detailed picture of the image.

#1 above is the PCV orifice in the intake manifold

Object ID: 3704958Click here for detailed picture of the image.

Object ID: 3704957Click here for detailed picture of the image.

#2 above is the PCV passage in the head


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post #4 of 20 (permalink) Old 01-31-2017, 01:06 PM
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Re: How to fix PCV freezing issue - DIY Solutions?

as rednox301 says ......


Document ID: 4098165
--------------------------------------------------------------------------------

#14882: Special Coverage Adjustment - Plugged PCV Orifice in Intake Manifold - (Mar 4, 2015)
Subject: 14882 – Special Coverage Adjustment – Plugged PCV Orifice in Intake Manifold

Models: 2010-2013 Buick LaCrosse
2011-2013 Buick Regal
2012-2013 Buick Verano
2011-2013 Chevrolet Captiva
2010-2014 Chevrolet Equinox
2013 Chevrolet Malibu
2012-2013 Chevrolet Orlando
2010-2013 GMC Terrain
Equipped with 2.4L Ecotec Engine (LAF, LEA or LUK)

--------------------------------------------------------------------------------

Condition
Certain 2010-2013 Buick LaCrosse; 2011-2013 Buick Regal; 2012-2013 Buick Verano; 2011-2013 Chevrolet Captiva; 2010-2014 Chevrolet Equinox; 2013 Chevrolet Mailbu; 2012-2013 Chevrolet Orlando; 2010-2013 GMC Terrain vehicles equipped with a 2.4L engine (LAF, LEA or LUK) that have experienced high oil consumption may also experience a frozen and/or plugged PCV (positive crankcase ventilation) system during cold weather operation. This condition may increase crankcase pressure leading to a rear crankshaft seal oil leak. If the oil leak is ignored or not noticed, an engine clatter noise may be noticeable and/or the engine pressure warning light may illuminate. If this condition is not corrected, continued driving with engine noise and/or the engine oil pressure light illuminated may damage the engine.

Special Coverage Adjustment
This special coverage covers the condition described above for a period of 10 years or 120,000 miles (193,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.

Dealers are to perform a crankcase pressure check, and if required, remove the intake manifold and clear the PCV orifice. The repairs will be made at no charge to the customer.

For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after March 4, 2015, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to March 4, 2015, must be submitted to the Service Contract provider.

Vehicles Involved
All involved vehicles are identified by Vehicle Identification Number on the Applicable Warranties section in GM Global Warranty Management system. Dealership service personnel should always check this site to confirm vehicle involvement prior to beginning any required inspections and/or repairs. It is important to routinely use this tool to verify eligibility because not all similar vehicles may be involved regardless of description or option content.

Parts Information
Parts required to complete this special coverage are to be obtained from General Motors Customer Care and Aftersales (GMCCA).

Note: Use the vehicle identification number (VIN), SI and the GM Electronic Parts Catalog to determine which parts to order. The Crankshaft Rear Oil Seal Replacement procedure in SI states what parts are required to complete the repair. For example, gaskets, one-time use fasteners, and fluids.

Part Number
Description
Quantity/Vehicle

12591866
Crankshaft Rear Oil Seal
1


Service Procedure
Crankshaft Rear Oil Seal Replacement

Determine if the crankshaft rear oil seal requires replacement.

•If the crankshaft rear oil seal does NOT require replacement, no further action is required. This bulletin provides coverage for replacing the crankshaft rear oil seal, performing a positive crankcase ventilation (PCV) pressure test and, if necessary, unplugging the PCV system.
•If the crankshaft rear oil seal requires replacement, Refer to Crankshaft Rear Oil Seal Replacement in SI. Proceed to Positive Crankcase Ventilation (PCV) Pressure Test in this bulletin AFTER replacing the crankshaft rear oil seal replacement.
Positive Crankcase Ventilation (PCV) Pressure Test

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post #5 of 20 (permalink) Old 01-31-2017, 01:39 PM Thread Starter
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Re: How to fix PCV freezing issue - DIY Solutions?

Thank you for the links and troubleshooting tips. So in essence; is this just something I need to live with and periodically check by removing the valve cover, intake, clean the pcv hoses, etc? I was hopeful that I may find a permanent fix that would adequately address the crankcase pressure issue by modification or improved parts. Thank you again for the links, and responding to my post!
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post #6 of 20 (permalink) Old 01-31-2017, 01:49 PM
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Re: How to fix PCV freezing issue - DIY Solutions?

Quote:
Originally Posted by Hockey90
Thank you for the links and troubleshooting tips. So in essence; is this just something I need to live with and periodically check by removing the valve cover, intake, clean the pcv hoses, etc? I was hopeful that I may find a permanent fix that would adequately address the crankcase pressure issue by modification or improved parts. Thank you again for the links, and responding to my post!
Cleaning it and possibly opening up the bore. Some have also drilled and introduced a parallel PCV route.
Short trips in very cold climates ice up the PCV. The best remedy is to run the vehicle a long time to assure through heat up of the crank case and valve covers to drive out built up moisture. Short trips are the cause of it in very cold weather.

<br />2015 Equinox LTZ 3.6L FWD Champagne Silver Metallic *Build Date 1-08-2015&nbsp; * * 20,300 miles
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post #7 of 20 (permalink) Old 01-31-2017, 01:52 PM Thread Starter
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Re: How to fix PCV freezing issue - DIY Solutions?

I'm very interested in boring it out and the alternate pcv routing... anyone have links or specifics? Thank you.
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post #8 of 20 (permalink) Old 01-31-2017, 03:20 PM
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Re: How to fix PCV freezing issue - DIY Solutions?

interesting.

for my 2010 3.6.
Just had my new PCV delivered to my front door this morning.
I will be drilling the larger holes on my newly delivered part.


in case you want to see home pics/info on the 3.6-

here is a link to the work done on a 3.6 on the oulook. (applies to the Traverse,Acadia, Enclave, Camaros, Cadillacs where the part is removable--- not all years are removable).

https://srxturnsignals.shutterfly.com/timingchain/703

2013 Equinox&nbsp; LT1 3.6L V6 FWD -&nbsp; &nbsp;60,000<br />2010 Traverse LT1 3.6L V6 FWD -&nbsp;127,000 <br />2003 Trailblazer LS&nbsp; 4.2L I6 RWD- 180,000
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post #9 of 20 (permalink) Old 01-31-2017, 03:36 PM Thread Starter
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Re: How to fix PCV freezing issue - DIY Solutions?

Thank you, great pics, I wish my engine had a PCV valve to replace!
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post #10 of 20 (permalink) Old 01-31-2017, 04:08 PM
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Re: How to fix PCV freezing issue - DIY Solutions?

on mine- its at 123,500- so well see what it looks like.

2013 Equinox&nbsp; LT1 3.6L V6 FWD -&nbsp; &nbsp;60,000<br />2010 Traverse LT1 3.6L V6 FWD -&nbsp;127,000 <br />2003 Trailblazer LS&nbsp; 4.2L I6 RWD- 180,000
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