Corrupter

iTrader: (1)

I've been trying to troubleshoot an issue for the last month now, and running out of ideas. Figured its time to ask here, hoping someone has had a similar issue and can offer advice

First up, the car. 2010 Evo SE with bolt ons, BBX Lite BB turbo, DW300, FIC 1100, tuned on e85.

The issue:
While driving on the highway at 40mph or so, I tried to go WOT. Instantly, had crazy misfire and no power. Let off gas, saw a CEL but didn't have anything to read it at the time. Limped the car home, continued to misfire and had almost no power. Lost power gradually as i was getting closer to home. Almost couldn't make it up the last hill.
Codes read system lean and cyl 1 misfire. Feared the motor was screwed, but started checking things to see what I could see.

Things I did, in order:
Compression test - OK
Drained oil - OK
Fuel pump was buzzing loudly at idle. Replaced it, thinking it went bad. Did not fix problem
Moved to injectors. Swapped stock injectors in and went back to 93 on a basemap. No more misfire, but still running lean. Doing a WOT pull, seeing normal AFR, then as soon as I hit boost (3500 or so) I go lean, gradually coming back to normal AFR as ecu pulls timing and motor has a couple 1-2 knocksum here and there. My tuner has tried to correct by adding a ton of fuel but it only made a small impact, not really evening it out.

What would you guys try to look at next? Is it worth sending the original injectors for flow testing since I am still having issues with stock injectors? Could something be causing fuel pressure to drop that I can check? Any known issues with stock lines or rail? Any advice would be greatly appreciated!

HatrixMouse

iTrader: (1)

Gonna start REALLY simple, just to cover bases.. do you have all your relays swapped to the new ones?

Corrupter

iTrader: (1)

Yes, relays swapped out while getting all of the other parts swapped in and then got tuned afterwards. I did do back to back pulls this week with both the original and upgraded relays, both were almost identical.

s240

hey man do you have a the stock boost controller selenoids?
and if you have an aftermarket boost controler did you change the vacuum hoses because it has resticting boost pills inside them

Corrupter

iTrader: (1)

Vacuum hose changed when 3 port was installed. No boost pills in use. I'd think that would have been an issue all along if that was the problem...

I think I might try to swap out the hose that connects the top of the fuel pump to the hangar. Came with a MAP install kit and looks really cheap and not sized well. Its like a straw you'd get with one of those souvenir cups at a theme park. Started out clear, but its brown now. Thinking maybe there's a crack in it somewhere and its dropping my fuel pressure?