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Valve cleaning on 2015 ecotec

Valve cleaning on 2015 ecotec

Postby mandinga [OP] » Mar 11 2016, 5:47pm

What is a safe and effective way to clean the intake on these engines? Any issues with using seafoam? Is there a better product?

I have a catch can, but would like to stay on top of it to avoid too much gunk buildup.
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Re: Valve cleaning on 2015 ecotec

Postby Spartan » Mar 12 2016, 6:26pm

I haven't personally used it yet, but I've read where others have successfully used Seafoam in the spray can, and the BG DI cleaner.
I would not hesitate to use any cleaner as long as it was designed and marketed for cleaning DI engines.
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Re: Valve cleaning on 2015 ecotec

Postby mandinga [OP] » Mar 27 2016, 3:03pm

So I went ahead and used the Seafoam aerosol spray. Much easier to use than the regular can. Took 4-5 minutes to empty the can into the intake through the throttle body. It made some smoke, but not nearly as much as when I did it on my Mazda Tribute years ago. Since I bought the truck new, I had a slight stumble at idle. I bumped up my idle speed by 50 RPM last week with my tuner. It reduced the stumble by about 50%. After this seafoam treatment it is gone 100%.

It obviously does something. The treatment was cheap enough and easy enough that I will probably do it every oil change. Highly recommend the spray can vs the regular can.
| CP HE catch can | AirLift Aibag's | LineX bedliner | Gator Back mudflaps | Duratrac LT285/60/20 | Diablew tune | MBRP Dual exit Exhaust | Bilstein 5100 shocks with 2" level

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Re: Valve cleaning on 2015 ecotec

Postby wildchevy » Mar 27 2016, 3:06pm

I always worry about that stuff taking out a O2 sensor, it can't be good for them.
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Re: Valve cleaning on 2015 ecotec

Postby mandinga [OP] » Mar 27 2016, 7:04pm

One thing I should mention incase anyone else is doing this. The engine needs to Rev at approx 1000 rpm above idle. Since I didn't have a helper, I used a brick on the floor nudged against the pedal. I would get the engine to Rev at 1800 rpm or so. After about a minute, the engine would die back down to idle. I figured it was just the brick moving. I would re-adjust the brick and continue. I later learned that this was probably the computer trying to re-learn and compensate the throttle position. When I went to go drive the truck. It no longer reconized the first say 30% of throttle movement.

When pulling out of the drive way I have it some gas and nothing..

10% input = idle
15% input = idle
20% input = idle
30% input = vroom! 30% throttle.

I pulled over, shut down the motor and restarted. It still did it but less severe. It took a few driving cycles before it returned to normal.
| CP HE catch can | AirLift Aibag's | LineX bedliner | Gator Back mudflaps | Duratrac LT285/60/20 | Diablew tune | MBRP Dual exit Exhaust | Bilstein 5100 shocks with 2" level

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Re: Valve cleaning on 2015 ecotec

Postby tallgears » Mar 28 2016, 4:05pm

Any write ups or instructional videos on how to do this procedure?
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Re: Valve cleaning on 2015 ecotec

Postby ericlw » Mar 28 2016, 4:42pm

I don't really see how this stuff is going to effectively clean the intake and such without taking it off. The carbon deposits on the back of the valves are baked on there good. its going to take something like crushed walnut blasting to remove it.
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Re: Valve cleaning on 2015 ecotec

Postby OilFracker » Mar 28 2016, 5:13pm

If I remove my intake some weekend to get a good visual on the intake valves and snap some pictures......is it mandatory/recommended to replace the intake gaskets? Or are they reuseable? "All Data DIY" says to replace them......but it isn't clear on if it is mandatory or not.

I have over 100,000 miles on my '14 5.3L EcoTec so far. I only installed a catch can just before reaching the 100,000 mile mark.
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Re: Valve cleaning on 2015 ecotec

Postby cintocrunch » Mar 28 2016, 5:23pm

OilFracker wrote:If I remove my intake some weekend to get a good visual on the intake valves and snap some pictures......is it mandatory/recommended to replace the intake gaskets? Or are they reuseable? "All Data DIY" says to replace them......but it isn't clear on if it is mandatory or not.

I have over 100,000 miles on my '14 5.3L EcoTec so far. I only installed a catch can just before reaching the 100,000 mile mark.


Based on the teardown videos I've seen it looks like they are rubber and reusable but at that mileage and for low $$ I'd just replace them... I wouldn't want to take everything apart because one fails after I put it all back together, did that once and don't plan to do it again.
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Re: Valve cleaning on 2015 ecotec

Postby ericlw » Mar 28 2016, 5:41pm

Glad to see someone with the same year and engine as mine with plenty of miles and no major carbon issues. I was really leary about the DI engines with other makers having major issues.
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