After hard pull, smoke cloud immediately proceeds
#1
![Default](https://my350z.com/forum/images/icons/icon1.gif)
I just noticed recently that after a WOT pull, there is a huge cloud of oil smoke proceeding when I let off or shift, reducing the load.
One part of me wants to say the turbos are in need of new seals, but if that were the case, they would smoke at cruising speeds and startup, not just after a hard pull in boost.
Then I got to thinking about excess crank case pressure causing an issue, where I would having blow by, but in reading the PCV thread here on the forums, I can’t justify that being the bona fide issue. BUT, it could be part of the problem that the PCV is not functioning problem. The kicker is that I do not have any oil in the charge pipe into the intake and this is where I start to find myself at a cross road.
I have been running synthetic oil in the car for the longest time, but wondering if the properties of synthetic oil could be causing the excess crank case pressure. I’m going to try conventional this weekend, see if that makes a difference.
I’m wondering if anyone has had a similar issue, and what you did to resolve it. When my turbo’s where completely blown, they never smoked at all.
The car still drives fine, no other issues, under vacumn there is nothing, but after a pull in boost I get this oil cloud.
Thanks in advance guys!
One part of me wants to say the turbos are in need of new seals, but if that were the case, they would smoke at cruising speeds and startup, not just after a hard pull in boost.
Then I got to thinking about excess crank case pressure causing an issue, where I would having blow by, but in reading the PCV thread here on the forums, I can’t justify that being the bona fide issue. BUT, it could be part of the problem that the PCV is not functioning problem. The kicker is that I do not have any oil in the charge pipe into the intake and this is where I start to find myself at a cross road.
I have been running synthetic oil in the car for the longest time, but wondering if the properties of synthetic oil could be causing the excess crank case pressure. I’m going to try conventional this weekend, see if that makes a difference.
I’m wondering if anyone has had a similar issue, and what you did to resolve it. When my turbo’s where completely blown, they never smoked at all.
The car still drives fine, no other issues, under vacumn there is nothing, but after a pull in boost I get this oil cloud.
Thanks in advance guys!
#2
Registered User
iTrader: (1)
![Default](https://my350z.com/forum/images/icons/icon1.gif)
in boost you have pressure in both crankcase and plenum...oil stays in the crankcase. coming out of boost the crankcase pressure is forced thru the PVC into the plenum. Do you have a catch can (I would assume at your power levels)? You might want to vent it to atmosphere if it's not already.
Last edited by djamps; 07-26-2012 at 05:29 AM.
#4
Registered User
iTrader: (10)
Join Date: May 2007
Location: san diego
Posts: 532
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
welcome to blow by. my smoking issue was terrible until i properly routed my catch can. you're right about the turbos. I remember when i blew the turbo on my dsm. smoke everywhere. i had the same problem you're having. go through that huge thread on routing a catch can. you'll see the best way to get rid of the smoking issue in there.
#5
![Default](https://my350z.com/forum/images/icons/icon1.gif)
I do not have a catch can currently, nor is it vented. I had not had this problem last year running a slight less in terms of power levels, and I hadn't had this problem until recently. Either the PCV system is not functioning problem then, or there is separation of the rings in the cylinders allowing oil through.
Hopefully the PCV system is the issue and a catch can will solve this. I will have to look at it all tomorrow night.
Hopefully the PCV system is the issue and a catch can will solve this. I will have to look at it all tomorrow night.
#6
Registered User
iTrader: (1)
![Default](https://my350z.com/forum/images/icons/icon1.gif)
I do not have a catch can currently, nor is it vented. I had not had this problem last year running a slight less in terms of power levels, and I hadn't had this problem until recently. Either the PCV system is not functioning problem then, or there is separation of the rings in the cylinders allowing oil through.
Hopefully the PCV system is the issue and a catch can will solve this. I will have to look at it all tomorrow night.
Hopefully the PCV system is the issue and a catch can will solve this. I will have to look at it all tomorrow night.
#7
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Yes, indeed surprising... No modifications to the valve covers or anything... No oil in the charge pipe either... It has only just recently happened, and I have been staying out of boost since.
I will be looking to vent to atmosphere first and see if that solves the issue. If it does, I will route in a catch can system.
I will be looking to vent to atmosphere first and see if that solves the issue. If it does, I will route in a catch can system.
Trending Topics
#14
New Member
iTrader: (8)
Join Date: Jan 2007
Location: terre haute, IN; STL, MO
Posts: 6,457
Likes: 0
Received 7 Likes
on
6 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
The blowby and pcv system won't push oil into the charge pipes, it will push it right into the bottom of the runners on the plenum and cause smoke that way. If the bottom of the plenum is clean then like rich said it's probably oil leaking into the turbine housing. When my pump quit oil was pouring into the turbine housing causing nasty smoke. After i cleaned it all out it took weeks to burn off all the small amounts of oil in the turbine housing. Doesn't take much oil at all in the exhaust system to cause a huge cloud.
The fact that it happens right when letting off sounds like a blowby and pcv problem. Catch can should stop that problem.
The fact that it happens right when letting off sounds like a blowby and pcv problem. Catch can should stop that problem.
#18
Registered User
iTrader: (4)
![Default](https://my350z.com/forum/images/icons/icon1.gif)
i know once in awhile ill get a smoke cloud from a very very tiny leak on my turbo feed dripping(or mayby just a thin shot onto it) on the turbine housing. i need to get under there and fix it, looked at it today when fixing my pass side three bolt gasket and really just did not want to mess with it. between that and a pan leak which i have yet to locate it can be pretty annoying since it dosnt even build up enough to tell where its coming from.