turbolgt Posted November 2, 2014 Share Posted November 2, 2014 hey everyone, had a question about cold start ups? now that the weather is getting colder here in NH i have been using the remote start from my porch with my morning coffee. The last couple days i have noticed nothing except for the day after i changed out the pcv valve. Today i am standing there watching it idle, enjoying my coffee, after about 30 seconds of run time it belches a denser cloud of blue smoke and as quickly as the smoke started, it stopped. Am i seeing the signs of ring and piston failure, a defective vf40 (which was replced at 70k) or simply the car running rich for the start up due to the colder weather? any ideas or thoughts are always appreciated. car has just over 86k with no mods. . . yet. new valve covers cam seals timing belt and water pump. Link to comment Share on other sites More sharing options...
Max Capacity Posted November 3, 2014 Share Posted November 3, 2014 30 seconds....I haven't heard of that before. If the valve seals are bad, that puff of blue smoke is right at start up. Might be rings. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
SpecBamf41 Posted November 3, 2014 Share Posted November 3, 2014 maybe just a glitch in the start up enrichment maps. BNR18g on 93oct Link to comment Share on other sites More sharing options...
turbolgt Posted November 3, 2014 Author Share Posted November 3, 2014 i figured if it was rings or even valve seals it would be repeatable day to day, this has not been the case though. It seems very random. i know next to nothing about the ecu mapping system but have been reading up on the basics, looking for a link between the remote start and keyed start. when i remote start is the only 2 times i had seen it and on cold days it holds the idle at around 1200-1500 rpms. when i manually start it i tap the throttle to idle it down and it sits around maybe 800 rpms. Link to comment Share on other sites More sharing options...
chato Posted November 3, 2014 Share Posted November 3, 2014 a broken ringland can cause strange intermittent behavior. but haven't heard of something quite like that. I'd guess that it is related to the PCV change. Link to comment Share on other sites More sharing options...
turbolgt Posted November 3, 2014 Author Share Posted November 3, 2014 thanks for the feedback. im kinda leaning toward a mechanical issue, such as the pcv but wanted to cover my bases and do some research on the ecu to see if there is something there that would cause this. the fact that its random makes it hard to diagnose, ive been trying to repeat it but have had no luck in doing so. Link to comment Share on other sites More sharing options...
chato Posted November 4, 2014 Share Posted November 4, 2014 i think your luck is that it doesn't do it every time! the PCV routes to the intake, and can have a bunch of clogged oil, theres a pretty good chance that something just got dislodged from the tubing or intake when you replaced it. but, also keep an eye on your turbo, when those seals go it can puff smoke, although that would tend to be more consistent. Link to comment Share on other sites More sharing options...
mikeydrives1 Posted November 4, 2014 Share Posted November 4, 2014 Time for a compression test. If that comes back good, its a bad PCV allowing oil to collect in your TMIC, which is then burned off during startup. Link to comment Share on other sites More sharing options...
InTheBay Posted November 4, 2014 Share Posted November 4, 2014 You could have also have a burned valve/valve oil guide/gouged valve surface that is damaged and leaking head oil into the cylinder. May be less prominent depending on where the crank is. Link to comment Share on other sites More sharing options...
turbolgt Posted November 5, 2014 Author Share Posted November 5, 2014 it has not done it in a couple days even after letting it sit trying to re create exactly how it happened. could be related to the pcv valve that i changed. im thinking if it was a burnt valve i would see it on a consistent basis after letting the car sit. must be one of those subaru things. oil level is checking out normal but ill check it out again tomorrow. Link to comment Share on other sites More sharing options...
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