Ok my car was running perfect until the other night, when i changed my oil, took out my O2 sensor to check it, and re-arranged my PCV setup. It was previously a shitload of hoses from the PCV to a small ghetto *** catch can, to the preturbo intake.

I took the PCV out, and was going to hollow it out, and instead ended up destroying it. So i took a 5/16" hose and stuck it in the hole where the PCV was and ran the hose straight to the pre-turbo intake. Now for the past two days my car has run like hammered ----.

I've tried disconnecting the hose, checking my O2 sensor, everything, and it doesn't want to run right. I'm led to believe that it's a PCV problem still. What happens is when you're driving it and give it some gas it will bog out a good ammount then as you give it more throttle it'll snap to life and rip to redline normall. Then if you try cruising again, it'll want to bog out unless you're at higher RPM. It also doesn't idle worth ----.

Another thought was that maybe all the ---- from my PCV hose going into the turbo gunked ---- up (the turbo was pretty dirty) and maybe the engine is trying to digest it all? I don't think it could be running overly rich because i haven't changed any of my settings on my VAFC. I also checked my plugs and they all seem normal.

So should i get a new PCV and a new catchcan? I'm pretty lost on this one. Also, if the O2 sensor were fucked, i don't think it would influence it that much would it?

 

i've always had codes because I'm OBD2 running the vafc hack, so i was getting a code for my barometric pressure sensor (map), and then two for my O2 sensor, but i figured that was because i'm not running the O2 sensor where the cat is.

It usually idles like ---- (around 500rpm) and tries to die out. Sometimes you can play with it and get it to idle around 1k.

 

i checked the code, the BARO code is because the barometric pressure sensor is intergrated into the map because it's OBD 2. The other codes are for the O2 sensor that i removed i believe. I'll check them later to be sure. Right now i have the car idleing, and i'm going to let it idle for a while and see what happens. Then i'm thinking maybe new plugs and wires and go from there

 

i had my pcv to pre turbo with no catch then realized it was cloggin up my throttle body with all the oil build up passing through. it wouldn't idle for ----. added the catch can, clean ic piping cuz of all the oil, clean out throttle body cuz of oil buildup from running no catch. idle smooth'd out, no more bogging popping. ran like a champ.

 

yeah i'm thinking that sounds like my problem.

 

Ok last night i took off my TB, cleaned it (it was a mess), then i cleaned all my IC piping and the compressor wheel of the turbo. Plus i double checked my O2 sensor, and that all seemed to make a huge improvement.

Today, it was running decent (i was trying to make it idle nice), so i take it to get gas, throw a half tank in it, and it's running like ---- again. I'm beginning to think this is fuel related somehow because it's still rich as ---- and i tried leaning out the bottom end and it doesn't help. Plus the ECU says i've had misfires on all four cylinders. Could a fucked up O2 sensor cause problems like this? The car runs great above 4K RPM, even at narrow throttle, but under that you have to be at WOT in order to make any power and to stop it from bogging. Plus my CEL started BLINKING while i was driving, i'm sure that's a good sign. I'm clueless, i really need some help guys!

 

Ok here's the latest developments in my dilema. This morning i drove it and it was good for a while then it started acting up again. So i pulled over and started messing with the vafc. I noticed that it was cooler this morning so i decided to add some fuel on the low end which seemed to make it better. After i ran my errands, i go back outside to start it up and it's running like ---- again. (Although now it's like 70 out) So i tried leaning it out to see if it would make a difference and it's still kind of weird. At full tilt it runs great. I also noticed that when trying to hold it at like 3k rpm while parked it'll drop to like 2200, and then go up a little. I also noticed that my O2 sensor voltage is FUCKED, which i'm assuming means the O2 sensor is too. Could the O2 sensor throw off my tuning that much?