The 3.0 and 3.6 Intake valve cleaning guide
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2008-2013 Cadillac CTS General Discussion Discussion, The 3.0 and 3.6 Intake valve cleaning guide in Cadillac CTS Second Generation Forum - 2008-2013; Thought I would cover cleaning the intake valve deposits manually. Tools needed are 10mm & 13mm socket & ratchet wrench ...
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    SC2150's Avatar
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    The 3.0 and 3.6 Intake valve cleaning guide

    Thought I would cover cleaning the intake valve deposits manually.

    Tools needed are 10mm & 13mm socket & ratchet wrench to remove the IM, a 19mm (3/4") socket to turn the crank as you move from port to port to ensure both valves are in the closed position, various long picks or narrow flat blade screw driver, and a set of 1/4" hex end brushes that can be fitted to an extension and drill to clean the deposits, shop vac and compressed air nozzle to remove the deposits as you loosen and clean them from the valves. This can be done in 2-6 hours depending on the tools and how handy the DIY guy/gal is:


    Brushes below show how they clog with debris, clean with brake clean between each port so they will still be effective.





    This can be done by removing the intake manifold, plug each intake port with a clean rag or better yet blue masking tape to prevent any debris from falling into a cylinder that may have a valve open, start with cylinder/port # 1 and make sure the intake valves are both closed by looking into the port with a flashlight or boroscope.

    The deposits will be anywhere from a thick "goo", to baked on rock hard...and so all know, upper induction cleaning is helpful, but you do not want to do it very often as the deposits when loosened while the engine is running, the smaller ones, will be forced between the piston and cylinder-wall and cause scouring. So ONLY do a solvent cleaning once in a great while, and with a good catchcan like the RX, you should have very little build up in the future. Below is a picture showing a low mileage piston with several upper induction cleanings done....if a little is good, a lot must be real good? No. There is a trade off for doing the easy quick fixes. Same as to much fuel treatment/injector cleaner will shorten injector life:


    So after making sure the valves are both closed so no deposits can fall into the cylinder, start with the long pick or screwdriver work the biggest accumulation loose first (don't worry about scratching, the valves and seats are hardened steel and there will be damage done). Use the shop vac to keep sucking the debris as it is loosened. After you get as much pried loose this way, then start with the brushes. You will be able to get most all the deposits cleaned and end up with this when completed:


    Vs this to start:


    After you have completed one port, then spray compressed air into the port to remove any particles the vac did not and clean and tape up that port and move to the next.

    I know this is not long and detailed, but should give most the steps to do this. The difference will be very noticeable in both power and fuel economy. Remember, it took time for this to gradually build up so most never notice the degradation but sure do the improvement after completing this.

    RX Performance Products/RevXtreme.com 941-721-1826

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    Hemi_Tom is offline Cadillac Owners Member
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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Good write up. Thanks!

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Nicely done.
    Me, well, I would rather drive the 4 hours and have you do it. Yes, I could do it but it would take me forever.

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    LOL! We charge $400 to do these....compared to $150-$250 for an upper induction cleaning that only cleans part of the buildup.
    RX Performance Products/RevXtreme.com 941-721-1826

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    Acdcpsp is offline Cadillac Owners Fanatic
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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    I have the non di 3.6. Do I have the same issue with build up on my valves?

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    No. Non DI the intake valves are constantly showered in the detergent fuel so deposits never get a chance to form (unless you run cheapo non-brand gas, then over a long time some deposits will form, but nothing like the DI engines). On a DI engine only air flows past the valves, the fuel is injected directly into the combustion chamber at 2000 plus PSI (depending on the engine) so it is a huge issue on them. You can still benefit greatly with a oil separating catchcan like the RX one though to keep the piston ringlands clean and better fuel economy.

    RX Performance Products/RevXtreme.com 941-721-1826

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    blankster is offline Cadillac Owners Fanatic
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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Does running something Sea Foam through a vacuum line help?

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Has anyone considered DIY using a sand blaster nozzle and crusher walnut shell? Walnut shell is cheep, <$1.50 a pound.

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Quote Originally Posted by Mistercoffee2 View Post
    Has anyone considered DIY using a sand blaster nozzle and crusher walnut shell? Walnut shell is cheep, <$1.50 a pound.
    I know that's big with the BMW guys, but I think they have special tools for that. I read on another forum where a guy tried that on his Camaro with mixed results. Wetness on the valve caused the shells to stick in there and were difficult to get out. I'd be afraid of leaving debris in there, or it finding its way in somewhere else.

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Stoked is correct. The BMW's seem to bake it on harder than the GM engines and the one we did in this thread was pretty gummy. The system the shops use with BMW has a lexan plate that covers the port and a shop vac attaches right to a fitting on it and the blast nozzle can be directed all around.

    As for Seafoam, BG, or any of the other solvent upper induction cleanings, yes, they do work to an extent but don't clean it all, and if used to often you will incure damage to the piston/cylinder walls from the hard particles as they loosen as the smaller ones are pushed between the piston and cylinder wall causing scouring. Using it now and then is fine though and after installing a good catchcan like the RX can we recommend doing one if not the manually cleaning shown here.
    RX Performance Products/RevXtreme.com 941-721-1826

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Bumping this back up to keep it available for those wanting to learn.
    wcthunder likes this.
    RX Performance Products/RevXtreme.com 941-721-1826

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    dmeray1 is offline Cadillac Owners Member
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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Source for brushes?

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Harbor freight....these are stainless we got from local supplier, but amazon has them as well.
    RX Performance Products/RevXtreme.com 941-721-1826

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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    If you need other sources PM me. They will be more expensive, however.

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    SC2150's Avatar
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    Re: The 3.0 and 3.6 Intake valve cleaning guide

    Bump for those wanting to do the manual cleaning.....this is by far the best result in dealing with existing deposits.
    RX Performance Products/RevXtreme.com 941-721-1826

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