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2012 GMC Terrain 3.0L V6 Intake Valve Cleanup #5282072 12/01/19 02:30 PM
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benjamming Offline OP
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2012 GMC Terrain 3.0L V6 flex fuel version with 207k miles
Took off the intake manifold to replace the spark plugs. Intake valves are quite the sight, i.e. lots of carbon buildup. What are some options for cleanup? AMSOIL power foam?

Thank you.

Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282086 12/01/19 02:46 PM
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slacktide_bitog Offline
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I hope you also replaced the valve cover gaskets while you were in there smile

Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282087 12/01/19 02:47 PM
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benjamming Offline OP
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I have the gasket set, but haven't replaced yet & was considering taking the kit back. I don't see any leaks. However, is that a common issue?

Last edited by benjamming; 12/01/19 02:48 PM.
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282162 12/01/19 04:00 PM
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slacktide_bitog Offline
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Valve cover gaskets are a common issue on any car with high miles. Even if they aren't leaking now, they could start leaking soon, and in order to replace them you'd have to pull the intake again! The valve cover gasket sets usually include spark plug tube seals as well. If those seals go bad, that could also cause trouble by fouling your plugs with oil.

So you are better off doing the gaskets now while the engine is still apart, so you only have to pull the intake once and won't have to do it again soon. I would also recommend ruthenium spark plugs, which last longer than even iridium.

Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282168 12/01/19 04:09 PM
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cronk Offline
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Amsoil Powerfoam would be my choice.


2008 Ford F350
2008 Kia Spectra
2011 Nissan Quest
1986 Pontiac Trans Am
1940 Ford 9N Tractor
Amsoil lubes and filters!
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282189 12/01/19 04:34 PM
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Jimzz Offline
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This is one of the stronger cleaners...

http://crcforshops.com/


yup
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282201 12/01/19 04:51 PM
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dblshock Offline
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just run TCW-3 in your fuel, steady.


05 Lexus GX470 175k
640:1 TCW-3
M1 0W40 XG-3614
Toyo Open Country H/T II

06 4Runner SR5 155k
640:1 TCW-3
M1 0W40 XG-3614
Falken Wildpeak AT3W
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: dblshock] #5282214 12/01/19 05:07 PM
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spasm3 Offline
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Originally Posted by dblshock
just run TCW-3 in your fuel, steady.



I think the terrain is direct injection. So the TCW-3 will not be going across the intake valves. ( i use tcw-3 for a winter storage mix in all my ope, 640:1 plus stabil)


13 elantra 81k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 17000 miles synpwr 5w30
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282227 12/01/19 05:22 PM
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benjy Offline
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mechanical cleaning of deposits from DI is by far the best + those wonders in a can only help a little. vids on DIY are on you tube or let a pro $$$ walnut blast it!!

Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282289 12/01/19 06:46 PM
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Audios Offline
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I like any stronger carb cleaner, or CRC makes a spray for carbon I believe.


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI- M1 0/30 ESP
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282297 12/01/19 07:02 PM
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dblshock Offline
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I always ran the TCW-3 in my 16 Civic DI 1.5T 40K my son has it now 55k runs like a fine sewing machine.


05 Lexus GX470 175k
640:1 TCW-3
M1 0W40 XG-3614
Toyo Open Country H/T II

06 4Runner SR5 155k
640:1 TCW-3
M1 0W40 XG-3614
Falken Wildpeak AT3W
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: dblshock] #5282313 12/01/19 07:20 PM
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Triple_Se7en Offline
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That sewing machine could be plenty dirty and still running fine. But for how much longer????


19' Hyundai Santa Fe 2.4 GDI - Valv Syn 5w30 / Napa Proselect filter / 6oz Liqui-Moly
20' Kia Soul X-Line 2.0 Multi-port / Factory-fill oil / filter
04' Colorado 3.5 / Castrol Edge 0W40 / K&N filter
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282322 12/01/19 07:26 PM
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dblshock Offline
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[Linked Image]


05 Lexus GX470 175k
640:1 TCW-3
M1 0W40 XG-3614
Toyo Open Country H/T II

06 4Runner SR5 155k
640:1 TCW-3
M1 0W40 XG-3614
Falken Wildpeak AT3W
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282323 12/01/19 07:30 PM
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benjamming Offline OP
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It is indeed direct injection. Flex fuel version but never run E85.

Last edited by benjamming; 12/01/19 07:30 PM.
Re: 2012 GMC Terrain 3.0L V6 Intake Valve Cleanup [Re: benjamming] #5282325 12/01/19 07:30 PM
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spasm3 Offline
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dblshock , I agree the pistons are super clean, but tell me how the tcw-3 can clean the intake valves when it never goes across them. The intake is the issue on DI engines, not the pistons.

Last edited by spasm3; 12/01/19 07:31 PM.

13 elantra 81k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 17000 miles synpwr 5w30
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