Good morning all!
Before I get into the symptoms, here's my mods list:
stock c/r 6bolt
AEM EMS V1/speed density w/GM IaT and 5.5bar MAP
Aeromotive FPR set to ~40 at idle, 43-ish w/o vacuum
3" turbo back
EIII 16g, 26lbs
Idles fatastic, on a dime @850/900rpm, just as it should, regardless.
Now then, onto the probs:
Yesterday, on my way home from work I came up on a car doing about 10 under the speed limit. Being as I work out in the boons, it was on a 2-lane highway and the speed limit is 65. which I cruise at about 70, maybe 75. In my attempt to go around this car, I floor it, and as soon as the car hit over 15-ish psi, I hear a bit of a "POP" and the car starts sputtering/misfiring/sounding like a subie. So, I back off of the throttle, and everything goes back to normal, not misfiring/etc. Perfectly normal. So, for giggles I get on it again, and same thing, above 15-ish psi, misfire/subaru sound. Tried it a few more times too, in different gears, starting at different RPMs and so-on, and the same thing. Above 15-ish psi, misfire/etc. Get to my house to pick up my dog, pop the hood and look around for any obvious signs of issues, boost leaks, torn couplers, popped hoses/etc. Find none. Car is "fine".
So, i figure "ok cool, when I get home, I'll pull the plugs and see if they've fouled". I go by my house, pick up my dog without issue(other than the assumed misfire under the 15psi+ pulls, which I didnt KEEP verifying at that point, figured it better safe than sorry), until I get out in front of my parents house. I pull up, put the car in neautral, set the e-brake and start to reach for the keys to turn it off, and it dies. Completely. I think to myself "that's weird", turn the radio down, and attempt to re-start. I notice I'm not hearing the f.pump run as I usually do, and my tach isnt bouncing as it always does right before it fires (a sign tha CAS is functioning properly, sending RPM signal to the ECU). Now, the fact that I've been trying to quit smoking alone, and been sucessful for the past 72hrs are so is fantastic. Inherently, the size of my fuse is significantly shorter, and I proceed to get extra-upset and curse up a storm. Figure thats a good time to take a break and do a little research...
So, I go inside, and DL the PDFs of the service manuals to my phone, and go thumbing through them a bit. I locate the relay diagrams/locations, and have calmed down a bit. So, I head back outside all bundled up (the sun is now down, and according to my phone it's 14* with the wind chill), flashlight in-hand, ready to go. I pop the hood, start inspecting fuses and such, everything looks good. So, I head to the inside of the car, put the key in the ign and flip it to ON, and listen. No f.pump, no tach bounce/etc. Still not working right. So, I decide I'll hop over to the other side, and inspect the relay. Start to pull things out of my glovebox and so-on(remember, it's 14* outside. I was trying to check it out while being able to sit IN the car, out of the wind and cold), get everything to where I can get at it, and throw the key in the ign again, for giggles. Turn it to the "ON" position, and guess what.....
So, I hop out of the car, run accross to the d.side and hop in, crank it over and sure enough. Pops right off, starts just fine. FANTASTIC! An intermittent cranks/no start! I LOVE THESE!!!
Anywho, at this point Im pretty upset again, and decide I should go back inside and warm up/cool down, before I break #5. So, I do just that. Head inside, have a couple beers and play some Wii. Then, I head to leave and take my dog home and such, extremely nervous about making it home and so-on.
Head to the car, pop the key in, pump primes, tach bounces, car fires as normal....(go figure). So, I let it sit and run to warm up to operating temp, because I want to see if the misfire is still there(which I found out later, it was). I also tried it again this morning, for grins with the same results. Still misfiring above 15-ishlbs.
So, there we have it. I know it's long-winded, but Im trying to be as thorough as I can in explaining whats going on. Like I said, it's cold as sheiza here right now, and the shop I normally have access to is full of cars that I cant move by myself from hitting curbs in the snow, and so-on....
Id like to be able to try a few things, and narrow it down some before I start digging into it completely. Its going to be another cold one today, which is NOT ideal for trying to figure out an intermittent issue....
So yea, any help or ideas would be greatly appreciated fellas. Thanks in advance, have a good one, and word to your mother(s)!