I have a direct injection 2012 Hyundai Accent with 197,000 miles I bought new that is sensitive to carbon buildup on the piston crown and combustion chambers. I actually drilled tiny holes in the intake manifold just before the head so I can stick the straw of a can of CRC GDI Intake Valve Cleaner and spray it directly onto the back of the valves. I unplug the coil for the cylinder I'm spraying with the engine running so the highly concentrated PEA in the cleaner will not burn in the cylinder and will coat the combustion space as well as the back of the valves. I've done this procedure before and it has a notable effect that is reflected in the fuel economy to the tune of at least 5 mpg on the road. I have a monitor plugged into the OBDII port and I can see less or no ignition timing is being pulled out under load, whereas before the treatment I saw an average of 4-5 degrees being pulled out under WOT and high RPMs. At part throttle I'm not sure how much timing is being pulled because the variables are so great, but I know at some points it is as much as 15 degrees because I was seeing "negative" timing numbers or for example -2 deg. (or 2 degrees AFTER TDC !!!) under lighter loads.
My question is will PEA in the crankcase cause undue harm or wear to the internals?
I wait an hour after spraying down a cylinder so it can do its work on the carbon, but I'm sure some PEA is pooling on the edge of the piston and probably leaking down past the rings and into the crankcase.
Last year I did a couple of these treatments and drove the car for a couple of days and then changed the oil. All has seemed fine since.
But do you guys think I am doing damage from the PEA getting into the oil or no?
As an important side note, I have found that buildup on the back of the valves really isn't an issue with my car as it still has just as much horsepower today as it did when it was new, so the intake ports couldn't be too choked off, but the issue seems to be carbon clogging up the combustion space. I've heard the DI creates more soot in the exhaust than port injection and apparently it may too cause more carbon buildup on the pistons and combustion chambers.
My question is will PEA in the crankcase cause undue harm or wear to the internals?
I wait an hour after spraying down a cylinder so it can do its work on the carbon, but I'm sure some PEA is pooling on the edge of the piston and probably leaking down past the rings and into the crankcase.
Last year I did a couple of these treatments and drove the car for a couple of days and then changed the oil. All has seemed fine since.
But do you guys think I am doing damage from the PEA getting into the oil or no?
As an important side note, I have found that buildup on the back of the valves really isn't an issue with my car as it still has just as much horsepower today as it did when it was new, so the intake ports couldn't be too choked off, but the issue seems to be carbon clogging up the combustion space. I've heard the DI creates more soot in the exhaust than port injection and apparently it may too cause more carbon buildup on the pistons and combustion chambers.
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