Cleaning Piston Carbon by Soaking
#1
Pit Crew
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Cleaning Piston Carbon by Soaking
While cleaning the intake valve carbon build up, I was rotating the crankshaft and didn't hit the TDC (Top Dead Center) on one of pistons. That meant, the that cylinder's intake valves were slightly open, and it drained all the carbon cleaning fluid (Chem-Dip and Seafoam) that I poured into the intake valve chamber to leak into the combustion chamber (on top of the piston). Crap, but I used that opportunity to soak the piston top overnight. Next day, I vacuumed out the liquid out of the combustion chamber, and I was happy to find the heavy carbon had come apart. I then took it out for highway speed driving for about 30 minutes, and verified that most (90+%) of the carbon got cleaned (burned off). So I did the same for the remaining 5 cylinders, and now I have pretty clean piston, in addition to the recent intake valve cleaning. The car definitely feels more responsive. I'll do some 0-60 testing in the near future to validate this.
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#3
Driver School Candidate
That's awesome! It's hard to find advice for getting rid of carbon in our direct/dual injected toyota engines. might try this out on my gs350 awd that i'm sure is full of carbon internally
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#4
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I've always try to follow the manual, but in this case, I think you are so correct.
I've been warming up to this idea and have been studying more about it.
As of today, I'm fully sold. I'm gonna immediately change to 3K-5K (max) oil change cycles.
Based on all the studies, maintaining good quality oil at proper level is critical in not seizing the piston oil control ring,
because once that fails, then cylinder wall damage and oil burning condition just accelerates downhill from there.
I need to measure my oil consumption more closely, but I think I'm losing about a quart every 2K miles,
but let me monitor all my cars closely and report back.
The Car Care Nut had best explanation on this.
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NormzGS350 (01-17-22)
#5
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Aren't GS350 dual injected? If you do open the intake manifold, I'm very curious to see what the carbon build up situation is.
Now that I know piston soaking works and it's easy to do, I may do this annually or every 10K miles.
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NormzGS350 (01-17-22)
#6
Mine is 2006 so it's GDI only and that's why I had such heavy carbon build up.
Aren't GS350 dual injected? If you do open the intake manifold, I'm very curious to see what the carbon build up situation is.
Now that I know piston soaking works and it's easy to do, I may do this annually or every 10K miles.
Aren't GS350 dual injected? If you do open the intake manifold, I'm very curious to see what the carbon build up situation is.
Now that I know piston soaking works and it's easy to do, I may do this annually or every 10K miles.
Best, Norm
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User 122922 (06-30-22)
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