Ok, so I found this issue after being gone for a month and coming back and hoping for, as usual, a normal brisk drive in my 93 r1. Little back story: the engine was rebuilt 7k miles ago and still pulls extremely hard and doesn't smoke under WOT. I always let the car warm up and cool down properly. I have no air pump and am still running the OMP.

Now: Fast forward to a few weeks ago when I returned from travel, after the car warms up, I get on it WOT and come to a stop light and bluish smoke pours out of the exhaust for about 30 secs and then stops. I go a bit farther, WOT again, no smoke after stopping. Hmmm ok, go a bit farther, pull into a parking lot, let the car sit at idle and nothing for a few minutes, nothing from the hood either; all looks good. Then I hear some sort of "click" like a relay or a pump/clutch starts and the smoke starts billowing. After a few revs and waiting a few seconds the smoke finally subsides.

I've repeated these similar results a few times and the oil consumption is noticeable after a few goes of this. I haven't pulled the power from the OMP, would that prove useful (I DO run pre-mix as an added safety)? I do not think it's the turbo b/c it doesn't smoke on the throttle, it only appears at vacuum/idle. I'm guessing it could be the oil seals in the engine, but after a few searches, I can't really tell how to check that, and it seems like that would be consistent and NOT intermittent as my problem seems to be.

Thoughts?

 

Does the smoke always follow the auditable click?

You still running sequential?

 

IIRC blue smoke is coolant. How are your coolant levels?

 

i've only heard the click twice and yes it does. it appears to rev just a tad lower after said click. and no, i'm non-sequential.

i believe you're mistaken - coolant is fine.

 

also noteworthy is the fact that the PCV and rats nest are deleted.

are there any vac lines that could have popped off or loosened causing this issue?

i'll try to get a video later this week.

 

blue smoke is oïl
white smoke with sweet odor is coolant
black smoke is gas

could be malfunctioning OMP. if it sends too much oïl in the chambers it will smoke out of the exhaust

 

i figured as much - why AND when is the question...IF the OMP is the culprit.

could the elimination of the PCV be an issue? again, I'll have to get more in depth on this during the weekend...

 

ok so trying to video this proved terrible, so here are some pics of what i've found. video is essentially this: imagine tons of smoke billowing out at idle after cruising ~50mph and coming to a stop - after a few revs, the smoke dissipates.

here are some pics of something i noticed; traces of oil that appear to be coming out of the stock BOV. for whatever reason, the previous owner left this open dumped to atmosphere and i knew that was a semi-normal thing so i never thought anything of it. but now i see trace amounts of oil outside of the outlet of the BOV and dripping down onto the subframe. also of note is a bit of "gunk/burnt oil" inside of the primary turbo inlet. probably a non-issue, but thought i'd post it anyways.

i'm still stumped and haven't had much time to get on it, but any help is appreciated. thanks much.

and just for reference, i saw this guy's video from a "cold start smoking issue" so figured i would post it and say my smoke is probably 2 - 3x more than this. http://s1297.photobucket.com/user/AL...1fb11.mp4.html

BOV setup


trace amounts below and forward of BOV


primary turbo inlet gunk

 

Def looks like ur primary turbo is leaking oil.

 

can you expand on that? i was under the impression if the turbo was leaking/burning oil, it would be constant and not a.) at idle, or b.) intermittent.

 

Although its not smoking right when you go on throttle it can still be caused by worn seals in the turbo. The oil pressure itself might be causing oil to get through the seals. The fact that ur turbo piping and bov have oil points to ur turbo or improper crankcase vent. Check the play/clearance of your primary turbo and move forward from there.