07 sti with just less than 10k miles. This just started. I've never noticed it before, but only on a cold start, blue smoke will come out of the exhaust for the first five seconds. It's daily driven and I haven't really been too hard on it. I'm not due for an oil change for another 2500 miles. What gives??
Well usually blue smoke is an indication of oil and white is water. I think it might be piston rings or valve seals, but thats an extreme scenerio. Your car is fairly new so maybe its the breathing system drawing oil into the cylinders and has some excess left over. Take it back to the dealer after getting some addional opinions. Did you buy it brand new?
my wifes just starting doing the same thing,it only smokes for a second or two and not all the time. Im going to try a oil catchcan and see if it helps.
^well, piston damage on some 07 STI's due to a generally poor factory tune on all USDM 07 STI's. Check for smoke out of the oil filler neck and get a compression check. Send it to the dealer too. Pull some datalogs and check on flrn kc, fbkc, kc, and idc in relation to rpm, throttle position, and load. The consensus on nasioc is that the stock 07 tune pulls timing like crazy and knocks all over the place. Also, the fueling system is maxing out at high rpm on stock tune and stock parts, causing lean misfires between 5k and redline (too rich, really high idc, not enough fuel, lean misfire). Folks are saying the fixes are a tune on factory parts (gabedude has a few free stg1 tunes on openecu), or a fuel pump + protune (+stg2 parts if you are so inclined). example of horrible knock on stock tune: http://forums.nasioc.com/forums/showthread.php?t=1398677&highlight=flkc some good reading for all 07 STI owners: http://forums.nasioc.com/forums/showthread.php?t=1312689&highlight=flkc http://forums.nasioc.com/forums/showthread.php?t=1402248&highlight=flkc http://forums.nasioc.com/forums/showthread.php?t=1358063&highlight=flkc
Sheen is right. The major problem with the '07 STI is that the injectors are simply to small for the stock tune. There have been a large number of cases of popped motors, and they all seem to be caused by high injector duty cycle and lean misfires (one lean misfire can blow a ringland), or injectors that fail because of this high duty cycle. Your car may not be bad; but with the '07 STI, you had better be careful. Get a compression and (if needed) leakdown test. After that, I would highly recommend doing some reading and running Gabedude's stage 1 map. He's put hundreds of hours into it, and it's hands down much safer then the stock tune.
if its all stock take it in to the dealership and make them deal with it, if it does pop they had better cover their problems i would say.
full catchcans and blowby lines can freeze in winter. pushing oil through somewhere.... maybe cam seals. next startup, open the oil fill cap and see if it blows out hard. cover it with your hand and see if the smoke comes back.
i agree, however how the hell cam seals are going to make smoke on startup is beyond me, perhaps valve seals you meant?
Hmmm. Did they get the oil rings in upside down? Doubt it, but the gaps are supposed to be on the up-side of the motor. Kinda hard for you to check though, haha. I don't see how a tune would fix an oil consumption problem. That is a mechanical issue. Before I had to rebuild my motor, once in a while I would get a few seconds of oil smoke on startup. It was probably because I may have had one or more oil ring gaps on the bottom side. I can't believe that Subaru would f up like that, but **** happens.
I appreciate all the info guys. I'm going to try to get it into the dealership next time it's open. I have never done a compression test or anything like that, so I'll just leave it up to the dealership. I just wanted to know what it could be. The blue smoke only comes out at a cold start like I said and lasts only about 5 seconds. There is no smoke any other time. It's weird. I would do a stage 1, but there is no warranty once I upgrade. So why would I consider that as an option? What if it happens again after I did stage 1 and the warranty won't cover it? Then what? I'll read up on the links and hopefully the dealership will work with me.
I'm reviving this with an update. About two weeks after I posted this thread, the blue smoke stopped with no work. :???: I talked to a tech at a local subaru dealership that told me it could just be that at the last oil change, they filled it too high. He also told me that the first thing that they would do to figure this issue out is to change the oil anyway. Well anyways, the point is, no more blue smoke, so we'll see how it plays out from here. I may go stage 2 with a protune this summer so I can just put the stress of this behind me. No worries would be great. Thanks for all the help with this for those of you who contributed. I appreciate it.
