Ok, I'm kind of stumped here and looking for suggestions. I have an evo9 with a built motor (9:1) that has maybe 3000 miles. Running pump gas with an fp red around 31psi.

I had the car tuned, ran it in ohio at the shootout. Fuel trims were near perfect for low/mid, car had no knock, etc. I had to do a state inspection so I put all emissions back in and stock exhaust. Reversed that after inspection and now fuel trims are messed up and my dip stick pops out any time I go WOT. Sounds subaru-ish at idle but not really bad, just faintly noticable. Before my trims at idle were -1 to +1, now sometimes they're 3% sometimes 17%. It seems when the trims are more out of wack its idling 100 rpm higher.

I'm not sure if the fuel trims and the dipstick/crank case pressure are related but both are new.

So far for diag, I've done:

-boost leak test, found two small leaks, nothing large or blatantly obvious.
-swapped a different PCV valve in
-compression test 125 135 135 135 (GSC s2 cams)
-leak down test 18% 5% 5% 10%
-went over the engine bay, nothing seems askew

Running out of thoughts here. The tune was taken off for inspection, but the very same tune that I had in Ohio, and it's way off. The dipstick popping at 30psi doesn't scare me, it does scare me that its a NEW problem though that wasn't present in ohio.

Mods:
fic 2150
ported intake/tbody
supertech valves
kiggly springs
wiseco hd
br crower rods
br 4" fmic
br licp/muse uicp
stock exhaust manifold ported
fp red
muse o2 dump
3" full exhaust

 

18% leak down on a "built" engine with only 3,000 miles would scare the crap out of me.even the 10% cylinder would scare me a little.they should all be 5% or less on a "built" motor that fresh.

 

I think it might have been less than 18, it was at the top of the green, maybe closer to 12-15%?

 

still too high.if the others are 5%,you have leakage on one cylinder,maybe rings.

 

I just fully warmed up the car, and re-did all of my tests. This time I actually took pictures so I wasn't going on bad memory.

Leak down: 8% 4% 5% 8%
Compression: 119 123 123 119

I also did a boost leak to 30psi which is higher than I was going before and I literally can't find any leaks. A LOT of air comes out of the oil cap/vc area, but if I disconnect the PCV hose and put my finger over it, theres barely any...so the PCV system sucks or something, its a brand new pcv too (car quest for dsm).

Also, just because I had a spare, I swapped mafs, no dice. Should ISC change something if I unplug it? Because it didnt.

At idle it was 17% stft this time. I give up

 

Nobody?

 

Did you happen to fill up at a different gas station. Here in pa there are still gas stations selling ethanol free 93, and of course the more normal e10 93 oct. That can swing the trims pretty far

 

Boost is making it from the intake manifold to the crankcase it sounds like. Something is not connected right or your PCV is stuck open

 

Also if you have a leak at the valve cover, pcv ect it might swing trims. I know if your logging and remove the oil fill cap it goes wacky.

 

Nope, few different fill ups.
I've tried 3 PCV valves so far (the one it had on there, one spare used one, and one brand new one).
Leak at the valve cover how? Like the gasket?

 

Well you are leaking compression either past the piston rings, (which you did a leakdown) or boost is making it into the crankcase.

If you tested 3 good valves then its possible you have the pcv lines mixed up and maybe boost is going to the vent to the valve cover etc.

 

The pcv is def putting boost into the vc but I can't see how. There is no emissions in the car so the only pcv type lines is the one from the manifold right to the valve.

 

you could try putting a check valve in line to eliminate the possibility of boost going into VC.

so your earlier leak down numbers were just wrong?

 

I was looking now for check valves. Would you add one in-line and leave the pcv or replace the pcv with it?

As far as the numbers, I think the one that was more off the motor moved when adding pressure, so this time I held the crank with a ratchet while a friend manned the leak down gauge. With the crank held they all leaked just about nothing. Really happy about that.

 

Still at this, more frustrated now than ever.

I've tried a different maf, new front o2 sensor, new injectors, different FPR, different IAC, many many boost leak tests, added a check valve in the PCV system, etc.

I'm baffled. Trims aren't even consistant. Some times they are ok, some times not.

I drove the car around today and then looked at trims LTFT Low was -3% and LTFT Mid was -11%. I changed some things in the rom and restarted the car and it was -20% at idle, so I put it back to the other settings and it didn't fix it and its still at -20%? What the hell.