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I think if you burned down a quart or two of oil they might look like they do. I think it could be a combo of this crud sprayed on the piston tops.................
......... and some oil mixed in with it. See some of these particles on your plugs. The plugs do not look particularly oil fouled. The ceramic tips are clean. Rusty chunks are sticking to the plug housings. Those will act like glow plugs in a diesel.
I had the plugs out for the compression check after I blew the dipstick, which was after I found the nasty fuel pump and swapped it out for a new one. The plugs looked perfect then and when I shined a flash light into the cylinders the piston tops looked shiny
This was about 200 miles ago. Now the pistons look like this and the plugs look like crap.
I honestly do not see how the pump corrosion could have created so much carbon in the cylinders in this time. Plus, my inline fuel filter was clean when I checked it.
I had the plugs out for the compression check after I blew the dipstick, which was after I found the nasty fuel pump and swapped it out for a new one. The plugs looked perfect then and when I shined a flash light into the cylinders the piston tops looked shiny
This was about 200 miles ago. Now the pistons look like this and the plugs look like crap.
I honestly do not see how the pump corrosion could have created so much carbon in the cylinders in this time. Plus, my inline fuel filter was clean when I checked it.
Well if oil consumption hasn't really been up much since 200 miles ago I find it hard to believe just oil is the cause then. I know those plugs can cause your knock issues. So if it got on the plugs it must have gotten on the pistons too...right? Hard to say how much came from your pump but it was one "butt ugly" mess. The deposits might have traveled through the filter and acted like a bad plating job. Spray some oil on it and burn it up......gonna be hard to tell what you got.
Your knock could actually be a bunch of "mini" misfires, which would cause carbon build up.
Also, when that check ball valve, all that boost pressure going into the crankcase could have forced oil out the turbo, through valve seals, etc. You have good compression, I don't think a leak down test is going to find a glaring issue.
It is possible the cylinders were honed wrong, causing the engine to consume oil, but that wont show up in leak down or compression tests.
So, my vote is still fresh plugs (gapped to .020") and fix that turbo oil line. If the turbo is coming off, I suggest switching the solid 90* fitting for a straight one, and then put a 90* swivel fitting on the feed line.
Okay. This weekend I spent way too much time finishing up wiring all my sensors, permanently mounting my RaceCapture MK2 unit, changing the oil in the car and putting fresh plugs in.
First off. Holy cow the MK2 logging rates (ECU and external sensors) is fast as hell. Tons of data points!
I would know exactly what they are per log but the Racecapture unit swallowed my SD card so now I have to pull the unit out and open the case to get the card back. Meh
I went for about a 10min drive, got back, pulled the plugs and they all looked clean so hoping the best on that.
My oil feed line is still loose but it doesn't leak. Still trying to get time with the damn shop to fix that.
The 0.065 turbo feed oil restrictor I installed didn't do crap for the burning oil. Car still burns oil at idle just the same as before. :-/
The fuel trims are still funky with them trending towards 10 positive. I even turned off flex fuel to make sure it wasn't some odd interpolation issue. I have the scaling at 709 for ID1300 on E76. Not sure why the trims keep getting added. Maybe the burning oil is mucking up my 02?
I have to admit I'm a bit bummed I spent a bunch of time on the car this weekend and went to drive it and all the problems still exist...
If the 5 bar MAP sensor is hooked up to an 8-bit ADC, you're not likely to see much because the pressure steps will be ~0.3 psi. At idle and cruise, I doubt you'll see anything if the factory PCV system is operational. If your block isn't properly ventilated, you may see something in boost though.
If the 5 bar MAP sensor is hooked up to an 8-bit ADC, you're not likely to see much because the pressure steps will be ~0.3 psi. At idle and cruise, I doubt you'll see anything if the factory PCV system is operational. If your block isn't properly ventilated, you may see something in boost though.
They are 12-bit ADC and currently logging at 50hz, and I can crank it up to 1000hz if I wanted. But yea, I don't expect to see much at idle,cruise. I installed it more for WOT monitoring of crank case pressure.
