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Old 05-19-2020, 07:26 PM   #1
DonM
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60 - 70 more miles per tank of gas.

I know that many feel that proper way to clean the intake valves is walnut blasting/manual cleaning and that using a spray cleaner is not a good idea, but I'm basically lazy and broke. I don't have the time or money to have someone do it for me or to buy the things I need to do it myself. So spray cleaner it is.

I've used Sea Foam in the past ... got the smoke show, rough running, CEL etc, but I never really saw/felt an improvement. So after going over more and more You Tube videos and a lot of research, I decided to give CRC, GDI Intake Valve & Turbo Cleaner a try.

I pulled the intake tube off the TB, and had the wife keep the RPMs around 2k, while I sprayed the CRC directly onto the butterfly. Took about 15 minutes to empty the can and then revved the engine to ~3,500 twice, let it run for a minute, then shut it off and let it heat soak for 1.5 hours. I drove it on the highway for about 25 minutes, cruising at 65 mph/~2,000 rms. No CEL, no rough running, no smoke, NOTHING.

On the way home, I gassed up and drove it normally for about a week. At the end of the week, I checked my trip odometer (which is how I track my gas mileage) and saw that on that tank, I got almost 70 more miles on that tank of gas, with no change in driving habits. To me, it also seems like my mid-range power is better too.

I did a lot of back and forth with CRC, and they stated that if I wanted to do a double treatment to make sure my valves etc are clean to wait 1,000 miles between treatments so the 1st treatment can fully do it's work (they state that a treatment continues working for roughly 400 miles of driving).

I'm hoping to get some details in, so I can get the JacFab intake manifold spacer and Laminator and then I'll be pulling my intake and actually looking at the valves to check their condition.
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Old 05-19-2020, 07:51 PM   #2
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How many miles on your car and what oil are you using? I've never used the CRC but I've read about it extensively. What I don't like about it is if there enough carbon built up it may cause chunks of carbon to hold the valves open and bend a valve. Also I've read of many having the cats block after using it. Its not everyone that runs into trouble but I think it depends on what engine oil you are using and how bad the carbon build up is.

Same with the dealer using their cleaner. I know of a customer that had the cleaning done and the car ran terrible afterwards. Took it some place else and they found a bent valve. I think the safest is to walnut blast them as big a pita it is to do.
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Old 05-19-2020, 07:58 PM   #3
DonM
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How many miles on your car and what oil are you using?
Right now, I'm just under 120,000 miles and I use AMSOIL
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Old 05-19-2020, 08:26 PM   #4
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I'm curious what you find when you pull the intake.
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Old 05-19-2020, 08:42 PM   #5
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I'm curious what you find when you pull the intake.
So am I.
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Old 05-19-2020, 10:10 PM   #6
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Old 05-19-2020, 10:47 PM   #7
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Edited

I use the seafoam fogger on the wife's Mini Cooper but it is GDI. Mini recommends pulling the head and having it walnut blasted due to the GDI design. I refuse. The seafoam works. Your Camaro is not the same though. The fuel washes over the valves and should be keeping them decently clean compared to a GDI.

I thought your signature said LS3 not LS. Fogging does work if done regularly for GDI engines
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Old 05-20-2020, 12:24 AM   #8
DonM
This is my 3rd Camaro
 
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Drives: All black '13 LS-M6 / Darth Camaro
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Edited

I use the seafoam fogger on the wife's Mini Cooper but it is GDI. Mini recommends pulling the head and having it walnut blasted due to the GDI design. I refuse. The seafoam works. Your Camaro is not the same though. The fuel washes over the valves and should be keeping them decently clean compared to a GDI.

I thought your signature said LS3 not LS. Fogging does work if done regularly for GDI engines
I was just surprised that I didn't notice any difference with the Sea Foam like I did with the CRC. I'm going to give it a 2nd treatment in about a week - 10 days, then most likely every 5 - 10K miles after that.
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Old 05-20-2020, 08:58 AM   #9
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I've been using Techron complete fuel system cleaner every 4k just before I change the oil. It makes a huge difference in how it runs and the fuel mileage goes up. Unfortunately its only cleaning the fuel injectors and cylinders not the intake valves. I also notice the cleaning effct doesn't last very long. The cylinders are dirty again within a few 100 miles. GDI engines should use a different fuel mix to help with this carbon thing. My next car will be non GDI.
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