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#4005197 - 02/09/16 05:23 PM Heavy-duty combustion chamber cleaner
TexasTea Offline


Registered: 09/06/13
Posts: 71
Loc: Texas
Hi all,

My truck is suffering from pre-ignition spark knock. I am in need of a heavy duty combustion chamber cleaner.

Just last weekend I wanted to clean my combustion chamber, i intended to buy seafoam but they were sold out so i used B12 Chemtool instead (i actually i think i like this stuff better).

I ran the chemtool thru a vacuum hose to the intake (not the brake booster it was actually a piece of vacuum hose i hooked up to the PCV inlet on the manifold since the hose on my 04 silverado 1500 is plastic i had to remove it and use my own, if that matters)

It was a little bit colder than usual night here in Houston TX, and several hours after doing the cleaning i went and took it for a spin and the spark knock was practically non-existent. 90-95% better. immediatley.

Today, while entering the freeway on-ramp i ran WOT trying to see if there was any spark knock happening and it did come back although this time it was a less "harsh" sounding ping (not so much "TICK TICK TICK" as it was "tshh tshh tshh" sounding) about 50% less harsh sounding than usual.

I know for 100% certainty that carbon in the combustion chamber has artifically raised the compression ratio in my engine causing the spark knock.

That being said, my dad seems to think the spark knock is caused due to "cheap gas" which I do use often, but im still expecting 87 octane which is prescribed for my truck, not to spark knock in the winter, even if its from a "generic" gas station such as "Murphy USA" (walmart)

Long story short: I'm wondering if anyone can reccomend a heavy duty combustion chamber cleaner, perhaps one that takes 30-60 minutes to complete, something I can rig up a system to feed the intake with while leaving the truck at idle so i dont have to worry about it stalling.

Also, i know a lot of people recommend filling up the intake with some solvent then killing/stalling the engine to let the solvent sit and clean or break up the deposits, and while i agree that is probably the best way to do it, i am actually too afraid of hydro-lock to do this, so i'd rather spend the extra money and do 2-3 treatments the way mentioned above rather than risk damaging the engine due to hydrolock.

I am considering the MOPAR and/or GM Combustion chamber cleaners, but I am open to any and all suggestions, and also I am interested in hearing anyones experiences chasing after spark knock and hopefully ridding themselves of it due to carbonization in the combustion chamber.

edit: i am also interested in both aerosol and liquid forms, however liquid would be most preferential. if i could rig up a system like the BG cleaner, i'd simply go get a can of BG44k (does anyone know how i can rig up something DIY to use this cleaner with? it seems perfect because it takes 30-60 minutes to actually complete the cleaning process and i need something that runs long and hard to get rid of 150,000 miles worth of PCV blow-by and carbon deposits)


Edited by TexasTea (02/09/16 05:27 PM)

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#4005202 - 02/09/16 05:29 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
demarpaint Offline


Registered: 07/03/05
Posts: 30154
Loc: NY
Hot water fed slowly through a vacuum line works very well at removing carbon. We've discussed it here a lot, or Google water to remove carbon in an engine for more info and how to videos. Just be careful not to hydro-lock the engine.
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#4005230 - 02/09/16 06:14 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
Ramblejam Offline


Registered: 11/05/13
Posts: 3212
Loc: Kentucky

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#4005234 - 02/09/16 06:18 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
anonobomber Offline


Registered: 03/04/10
Posts: 208
Loc: WA
Mopar combustion chamber cleaner has worked really well for me in the past and is about $10 for a can.

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#4005259 - 02/09/16 06:46 PM Re: Heavy-duty combustion chamber cleaner [Re: demarpaint]
Branson304 Offline


Registered: 07/07/15
Posts: 1025
Loc: North America
Originally Posted By: demarpaint
Hot water fed slowly through a vacuum line works very well at removing carbon. We've discussed it here a lot, or Google water to remove carbon in an engine for more info and how to videos. Just be careful not to hydro-lock the engine.


He is right. Water works well, there are videos around the internet.

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#4005270 - 02/09/16 07:03 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
dblshock Offline


Registered: 04/24/07
Posts: 2785
Loc: WI.
Run 128oz. of TCW-3 in your fuel 640:1
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640:1 TCW-3
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#4005309 - 02/09/16 07:26 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
chad8 Offline


Registered: 08/26/09
Posts: 1343
Loc: michigan
This is the best stuff you can buy. You can not hydro lock foam if done right.

http://www.amazon.com/Johnson-Evinrude-Engine-Tune-Up-777185/dp/B001KYJAL0

When you are done , buy an OEM set of spark plugs and wires for that motor. NOT replacement [censored] .
Knock will go bye bye.

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#4005362 - 02/09/16 08:05 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
KingCake Offline


Registered: 11/19/15
Posts: 1462
water

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#4005371 - 02/09/16 08:11 PM Re: Heavy-duty combustion chamber cleaner [Re: demarpaint]
KingCake Offline


Registered: 11/19/15
Posts: 1462
Originally Posted By: demarpaint
Hot water fed slowly through a vacuum line works very well at removing carbon. We've discussed it here a lot, or Google water to remove carbon in an engine for more info and how to videos. Just be careful not to hydro-lock the engine.


In WWII many of the turbo/supercharged fighter engines, like in the P-38, had water injection systems. Safe, effective, cheap.

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#4005402 - 02/09/16 08:32 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
oemjunk Offline


Registered: 02/03/16
Posts: 28
Loc: New york
Could be knock sensors going bad, but just not bad enough to throw a code. I would try better fuel first before testing or bypassing them however.
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#4005877 - 02/10/16 09:58 AM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
TexasTea Offline


Registered: 09/06/13
Posts: 71
Loc: Texas
Thank you for all the suggestions I am actually impressed by the amount of products available suggested here, many thanks.

Some bg on the spark knock:
I just replaced the knock sensors, intake gasket, harness, AND plugs + wires about 1 and 2 years ago respectively. I wish i had done this comb. chamber cleaner before all that, i dont want to mess up my new spark plugs these are "supposed" to last the rest of the life of this truck... ;_;

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#4006074 - 02/10/16 01:37 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 19040
Loc: Sunny Florida
We run a fleet of GM 5.3's and 6.0's. Carbon knocking is a familiar complaint here. 2 cups of Kreen in the gas tank removes every trace of it FAST...
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#4007927 - 02/12/16 10:16 AM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
ironman_gq Offline


Registered: 04/30/14
Posts: 604
Loc: MN
https://www.youtube.com/watch?v=izvz18xgfA0

Watch this and find a sprayer line the one he's using. Disconnect the intake tube from the throttle body and get the rpm's up to 2000-2500 and start spraying.

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#4009079 - 02/13/16 10:16 AM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
CT8 Offline


Registered: 10/09/14
Posts: 11483
Loc: Idaho
Water.Then there is the well tested Italian tune up.
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Geoff Metcalf

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#4095187 - 05/12/16 07:51 PM Re: Heavy-duty combustion chamber cleaner [Re: TexasTea]
DallasTexas Offline


Registered: 08/22/14
Posts: 68
Loc: Texas
I have used Kreen on my Diesel Benz with almost 300k miles and it cleaned up 19 years of sludge, freed up rings and felt like the car I purchased it 18 years ago.
Put it in the crankcase and drive 500 miles, drain and change oil/filter. It has money back guarantee.
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