2011 Equinox 2.4, 175,000 Miles Check Up - TerrainForum.net: GMC Terrain Forum
 
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post #1 of 10 (permalink) Old 04-10-2019, 01:40 PM Thread Starter
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2011 Equinox 2.4, 175,000 Miles Check Up

I am new here, so if I should have posted this somewhere else please let me know.

I have a 2011 Chevy Equinox with a 2.4. I just took a picture (see attachment) of the top of the piston top on the passenger side of the vehicle. Does this look normal for a 2.4 with 175,000 miles?

I am just checking things out and cleaning vacuum lines, cleaning MAF sensor, changing oil etc...

This seems to be a Good Equinox but I am getting the occasional P0420 code. I can clear the code but it comes back within about 200 miles more or less.

I did just replace a cracked exhaust manifold with a new one.

I do read the horror stories on this forum about multiple issues that do concern me.

I change my oil every 3,000 miles and it will use close to 1 quart of oil between changes.

I don't ever get any other codes from my OBD2 reader.

Please see attachment of live data which I know nothing about and please give me your thoughts if the data is normal or abnormal...

I am concerned about the catalytic converter being replaced... but if I have underlying issues that need to be addressed prior to cat replacement. I don't want to replace it and have other issues that will create the same P0420 code.

My air filter is clean, I don't have sludge in the PVC tube or the breather where it connects. All is dry. I don't have sludge on my oil cap but when I take my oil cap off I do have pressure coming out but I don't know if it is excessive.

See additional attachments...

MY OS2 B1 voltage varies under different driving conditions. When I remove my foot from the gas pedal my voltage will drop to zero but a lot of the time my front and rear data is similar.

MY STFT B1 S2 always remains at 99.2.... Is this normal? It never changes...

Any advice, questions or comments is appreciated...

Thank You
GT
Attached Images
File Type: jpg piston 1_175000 miles.JPG (89.9 KB, 21 views)
File Type: jpg Live Data.JPG (38.8 KB, 12 views)
File Type: jpg My Equonix.JPG (81.7 KB, 16 views)
File Type: jpg O2S B1 S2.JPG (108.2 KB, 13 views)
File Type: jpg STFT B1 S2.JPG (87.5 KB, 10 views)
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post #2 of 10 (permalink) Old 04-10-2019, 03:36 PM
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Appears to be carbon buildup.


If you have not- you can run Techron Concentrate Plus to begin to clean that out.


as for the code-
have you ever changed your Oxygen sensors?
You may also want to run a product called Cataclean. see if it helps.

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. Oxygen sensors are also referred to as O2 sensors.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

2013 Equinox LT1 3.6L V6 FWD 83,000
2010 Traverse LT1 3.6L V6 FWD 148,000
2003 Trailblazer LS 4.2L I6 RWD 181,000
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post #3 of 10 (permalink) Old 04-10-2019, 04:28 PM Thread Starter
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Thank You for your reply!

I have never changed my oxygen sensors. I did use Cataclean in my fuel tank and followed the directions. Cataclean did keep my light off for a period of time but did get the P0420 code again. I also use Top Tier fuel. I do hear good things about Techron Concentrate Plus. I will run out to the parts store now and buy some Techron. I will try that out with in the next hour. I think I do have a slight oil leak but never any evidence of oil on my driveway.

I also read that this Equinox does not have a true PCV but has a crankcase ventilation built into the valve cover. I am also concerned the small orifice in my intake manifold could be dirty as well. Is there a way to clean the small orifice without removing the intake manifold?

I am trying to educate myself on the fuel trims and what the data should show to be normal.

The Equinox does run well and smooth. The idle is smooth. I was traveling down I-75 on Monday at a high rate of speed and i did get a (smoother) graph on my live data. I am assuming increased RPM's does something to my graph from the live data. I know my cat temperature will increase to 1,600 degrees while my RPM's are increased. As soon as I let completely off of my throttle my bank 2 sensor will bottom out and flat line. I will press my throttle and my graph is no longer flat lined.

I also read forums about GDI engines and carbon build up on top of the valves. I am sure I have carbon build up on the top of my valves with 175,000.

Additional Thoughts?

Thank You,
GT
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post #4 of 10 (permalink) Old 04-10-2019, 06:12 PM
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Welcome to the forum GeeTee, one question, is this a Nox you have owned since new, or just new to you? I'm a big believer in Techron, mainly because it keeps the injectors clean and for some reason prevents problems with the fuel level sensor on the fuel pump in the tank, maybe because it removes varnish on the float shaft. Anyhow at this point in your case I doubt it will help much with combustion chamber carbon, and certainly not with carbon buildup on the back of the valves. I always stock up on Techron when one of the big box auto parts stores run a 2 for 1 sale on it as it's spendy. As far as the valve cover, someone posted on here not all that long ago about having that hot tanked at a machine shop to clean up the crud, mainly to prevent timing chain and guide problems and he said it's not all that hard to remove, although my wife has a 17 Nox with the 2.4 I haven't gotten that far into it other than routine maintenance as it only has 20K on it and I'm an old SBC V8 guy. Only other thing I can add is do frequent oil changes with full synthetic Dexos oil.
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post #5 of 10 (permalink) Old 04-10-2019, 08:59 PM Thread Starter
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Thank You!

I've owned this Equinox for 11 months. It was a one owner vehicle.

I purchased a bottle of Techron Concentrate Plus and added it this evening.

My MIL came back on as i was entering the car wash this evening. (P0420 again) Please see the attachment of my live data when my light came back on.

Thank You,
GT
Attached Images
File Type: jpg STFT B1 S2 41019.JPG (132.2 KB, 8 views)
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post #6 of 10 (permalink) Old 04-10-2019, 09:15 PM Thread Starter
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Attached is live data from Monday and today.
Attached Images
File Type: jpg Nox Data.jpg (111.5 KB, 10 views)
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post #7 of 10 (permalink) Old 04-19-2019, 09:18 PM Thread Starter
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Hello Forum!

I turned my mil off and drove about 100 miles and the mil came back on. I checked the codes and got the P0420 again. It looks like I will have to replace the cat.

I am running Top Tier fuel along with Techron Concentrate Plus when I fuel up.

I just had my oil changed.. I change it every 3,000 miles...

I have a very slight oil leak noticeable while under the nox but never leaks on driveway...

Today, I decided to change valve cover gaskets and inspect my timing chain to see if it was loose. The chain is very tight. The valve cover gasket and is not brittle. I just ordered a valve cover gasket and will be here tomorrow at 1:30.

Please see the attached pictures to determine if everything looks normal for an engine with 175K miles on it.

I have before and after cleaning pictures of the inside of the valve cover. The valve cover has two tabs that stick down that had a lot of nasty build up inside that came out when I sprayed the cleaner through it. Are those tabs part of the crankcase ventilation system?

Tomorrow morning, I am removing my throttle body and going to clean it and I am going to remove the intake manifold and clean out the 1/8" hole that so often gets clogged up. I believe that little hole is part of the crankcase ventilation.

The nox runs and drives awesome but likely needs the cat replaced. I am trying to be proactive and do what I think needs to be done to extend the life of the vehicle.

I don't know but I feel I have excessive pressure coming out of the crankcase when I remove the oil filler cap. I am not sure how to measure that but just by feeling it seems very excessive??

Does anyone have additional recommendations on what else i can do?

Thank You!
GT
Attached Images
File Type: jpg Nox Inside Valve Cover 175K B4 Clean.jpg (773.3 KB, 15 views)
File Type: jpg Nox Inside Valve Cover 175K After Clean.jpg (622.3 KB, 14 views)
File Type: jpg What are these tabs.JPG (171.0 KB, 11 views)
File Type: jpg Nox Throttle Body.jpg (348.2 KB, 11 views)
File Type: jpg Nox Cams 175K.jpg (803.4 KB, 12 views)
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post #8 of 10 (permalink) Old 04-20-2019, 11:30 AM
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Quote:
Tomorrow morning, I am removing my throttle body and going to clean it and I am going to remove the intake manifold and clean out the 1/8" hole that so often gets clogged up. I believe that little hole is part of the crankcase ventilation.
It is. It is probably the cause of the sludge build up in your engine. Clean the PCV circuit and the sludge should stop forming. Installing an oil catch can may be of some benefit too.

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post #9 of 10 (permalink) Old 04-20-2019, 10:38 PM Thread Starter
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Thank You!

Today I put the valve cover back on with a new gasket. I also removed the throttle body and cleaned it.

I looked at my serpentine belt and it looks a little damp with oil. I need to check into see where that's coming from. I need to address that before I install a new cat...

I didn't have time to remove the intake manifold to clean out the crankcase ventilation port. I will do that on Monday.

What determines that I will need an oil catch can? I have read a little about it but still unclear.

The Nox is in really good shape for 175,000 miles and I want to do my best to keep it that way.

I took it for a test drive this evening for about 55 miles. Combination city driving and interstate and it's showing 25.8 MPG. I checked for leaks and everything seems to be operating good. (no leaks on my valve cover)

Thank You,
GT
Attached Images
File Type: jpg Throttle Body Before Backside.jpg (490.5 KB, 2 views)
File Type: jpg Throttle Body After Backside.jpg (321.0 KB, 3 views)
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post #10 of 10 (permalink) Old Today, 01:34 AM Thread Starter
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Well, I took my intake manifold off and inspected the small orifice and it was severely clogged. I cleaned it out and reinstalled the manifold. I drove about 190 miles today. My MPG has improved. The Equinox is running stronger. I am finally getting negative vacuum pressure at the tube on the valve cover. I am assuming it is breathing normally at this point. I drove it pretty easy the first half of the day and drove a little harder tonight coming home. I saw an average of 30.3 MPG at one point and ended the day at 28.3 MPG.... Part of my driving was interstate, city and curvy country roads. I am going to replace the catalytic converter because my voltage on my O2 sensor behind the cat is somewhat erratic... But not as erratic as it was before cleaning my crankcase ventilation. My life data voltage will drop when I let off of the accelerator... To my understanding that is an indicator the cat is not doing it job and needs to be replaced.

I thought I would give a brief update.

Thank You,
GT
Attached Images
File Type: jpg Plugged Intake Mainifold Orifice.JPG (35.0 KB, 3 views)
File Type: jpg Cleaning Intake Manifold Orifice.JPG (40.4 KB, 3 views)
File Type: jpg Best MPG Ever.JPG (53.7 KB, 2 views)
File Type: jpg Equonix.JPG (144.8 KB, 2 views)
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