2G White Smoke On Decel

[wing3r09]

Hey guys, Not sure where to post problems like this.

Experiencing "some / a lot" of white smoke when decelerating after a WOT pull.

Checked turbo outlet (hx35) and IC pipe, dry as a bone. Checked hotside of turbo, also dry.

PCV is relatively new < 2000 miles. Head was rebuilt with new valve stem seals < 2000 miles as well.

Block is original as far as I know though 177,xxx. Right now my VC vent is to the intake with a little fuel filter/oil catch, and the PCV is to the intake manifold with a check valve.

With reading up, some say the Valve seals, others say piston rings, and some say turbo seals. My thought also could be blow by? I dont have the best catch can PCV system, turbo is dry, and the head is relatively new. any other ideas suggestions let me know!

 

[Dsmkauai]

White smoke if your positive is usually coolant. How much boost you pushing? What hg and studs you using? Have you checked you oil/coolant for possible mix. Head being new wont matter if it lifts from to much boost or a bad tune. What injectors and pump are you running with this setup? Not in your profile Bro.

 

[wing3r09]

Fuel mods updated in profile.

950cc FIC Walbro 255.
20 psi

It smells like oil, and I know synthetic oil burns white according to things i've read on this site.
Commetic MLS / ARP studs.
100% water with water wetter, and no sign of oil mixed in with the water.
Tune was done at Strickly Performance in Kalamazoo, not saying something could be wrong with it but doubt the tune would effect burning oil/water.

 

[2gGst98]

Compression test / leak down will say if it's rings or HG. But I was always under the impression rings would smoke all the time weather it's a lot or a little. Have you checked intake manifold after PCV for oil. When I got my new PCV from advance it didn't do crap but blow oil still second one was ok though. Just a though, hope it's not a big issue for ya.

 

[wing3r09]

Compression test / leak down will say if it's rings or HG. But I was always under the impression rings would smoke all the time weather it's a lot or a little. Have you checked intake manifold after PCV for oil. When I got my new PCV from advance it didn't do crap but blow oil still second one was ok though. Just a though, hope it's not a big issue for ya.

Compression test was done before tuning, and checked out good by Strickly. Things could have changed, so I will have to get a hold of my buddys compression tester. I'll also have to look up a leak down test as I have no knowledge of those.

Just pulled off the hose off the PCV and found a good about of oil residue. Will head to autozone in the morning to snag a new PCV and see if this helps the problem.

 

[Steven Nguyen]

I would recommend a leak down test, defiantly will tell you if your head gasket is blown ect. leak down is just like a compression test but instead your putting compressed air into the chamber to see the percentage of loss compressed air per cylinder.

 

[oneslowwdsm]

I would re-tq headstuds. Blow by really should have a blueish look no matter what oil you use. Maybe time to invest into a legit catch can system?

 

[Dsmkauai]

Should actually always retorque the headstuds after one or two heat cycles. When things are new, hope you can figure it out bro. It's possible a valve stem seal popped out of place. May want to pull the valve cover and check out. Also using a mls did you have the head and block done to be perfectly flat? I would start with a compression test and leak down and go from there. It's possible for the hg to leak oil into the cylinders and not be present in the coolant. Just depends how bad it's leaking.

 

[Steven Nguyen]

Huh I've never heard of re-torquing head studs after a few heat cycles, maybe I should do that for my recent rebuild . Let us know what your results are for the compression/leak down test.

 

[wing3r09]

Should actually always retorque the headstuds after one or two heat cycles. When things are new, hope you can figure it out bro. It's possible a valve stem seal popped out of place. May want to pull the valve cover and check out. Also using a mls did you have the head and block done to be perfectly flat? I would start with a compression test and leak down and go from there. It's possible for the hg to leak oil into the cylinders and not be present in the coolant. Just depends how bad it's leaking.

Re-torqued the studs after the ARP recommended 500 miles.

If i were to look for valve stem seals by taking off valve cover what exactly would I be looking for.

The head was decked, and the first shop i had taken it too said the block would be fine... should have just had it decked but lesson learned.

Still weird that it only does it on decel, but i have noticed a little when boosting on WOT not nearly as much when decelerating though.

Going to harbor freight today to get a leakdown tester, Thought they would be a lot more expensive than that. Since owning this car this will be a good tool to invest in . Also grab a compression tester instead of borrowing a buddy's.

 

[miliman13]

Wow, so many extremes! Sounds like you just need a catch can.

 

[miliman13]

Experiencing "some / a lot" of white smoke when decelerating after a WOT pull.

There is the key words.

 

[wing3r09]

There is the key words.

Key words as into why a catch can system would help my problem?

 

[wing3r09]

Okay so" didn't get a chance to get my Leak down tester, or compression tester, (planning on either tomorrow or tuesday), but i did take of the intake pipe, checked turbo for oil, that was dry, but there was oil sitting at the bottom of the intake pipe before the compressor housing, and oil where the VC vent line is hooked into the intake pipe.

Been planning out a better Crankcase Ventilation system, w/ catch can and an fittings, but am going to need aluminum baffles to replace the the stock ones when doing the fab work for the an fittings.

Could this small amount of oil be causing my white smoke on decel, something to do with vacuum?

 

[Dsmkauai]

Yes it could. Don't worry about the an lines and all. Just get a simple catch can in there to soak up the oil instead of it going thru your motor and intake track. Get a new oem pcv valve or similar.

 

[wing3r09]

Yes it could. Don't worry about the an lines and all. Just get a simple catch can in there to soak up the oil instead of it going thru your motor and intake track. Get a new oem pcv valve or similar.

Okay, I will work on getting a simply system to help out the oil getting in places it shouldn't for now. PCV will be switched out. Post up what I find tomorrow as far as the PCV goes.

 

[Dsmkauai]

Also take out all the ic piping and your intercooler and clean it out with gas. Gotta get all the oil out.

 

[97 eclenger]

oil burns a blueish color. white is coolant. run a leak down as said before. it'll tell you where its leaking if it is. you'll either hear air coming out from the intake or air from the oil fill cap. if its a head gasket you'll see bubbles coming out in the coolant fill area

 

[miliman13]

And, pink smoke is when your fairy god mother gets sucked up into your turbo..

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It's not always blue, higher volume of oil in the charge pipes will come out white.......
My witness accounts are, a blown t25 made my car look like a locomotive!! Thick very heavy white , smoke flew out exhaust untill it siezed the rotating assembly (absence of oil). Bad ventilation can yield similar results.

 

[wing3r09]

Okay so update on the compression test and leak down.

Went to harbor freight to get my testers, and after using their products, I am not sure how much i can trust the numbers from these tests.

Compression Test

Test 1:
Cyl 1 148
Cyl 2 138
Cyl 3 154
Cyl 4 154

Test 2:
Cyl 1 152
Cyl 2 136
Cyl 3 150
Cyl 4 150

These seem super low, as before at strickly performance in June they told me compression was around 180 on all 4.

As for the Leak down test goes. This tester flat out sucks.. One you cant test past 10 psi for the second gauge to be any use, and even when locked in the pressure fluctuates... So i just put 90 psi into the cylinders to see if i could hear any leaks, and when 90 psi in cyl 4 air was coming out of cyl 3... and vise versa.. I'm taking this as blown head gasket between the two cyl... ugh.

 

[2gmitsueclipse]

The biggest concern to me was that you had the head decked, but not the block. Cometic requires a 50 RA or finer for effective sealing of the head gasket. Assuming it was at least flat, I would have used a composite head gasket.

 

[wing3r09]

Yeah I'm kicking my self in the A$$ now for not just having that done. The Shop that I went through to get the head built said since the block is cast iron it should be fine and not warped, but with all these symptoms i'm having its all point to a bad matting area letting oil/coolant into the cylinders after a pull and causing white smoke.

 

[2gmitsueclipse]

Yeah I'm kicking my self in the A$$ now for not just having that done. The Shop that I went through to get the head built said since the block is cast iron it should be fine and not warped, but with all these symptoms i'm having its all point to a bad matting area letting oil/coolant into the cylinders after a pull and causing white smoke.

You have some good feedback here from the builder:

"The Shop that I went through to get the head built said since the block is cast iron it should be fine and not warped."
​

You should have at least checked it yourself for flatness. "Should" would not be acceptable to use a mls head gasket. It is a common mistake though. Both mating surfaces must be decked properly to accept an mls gasket.

 

[wing3r09]

Lesson Learned.

You should have at least checked it yourself for flatness. "Should" would not be acceptable to use a mls head gasket. It is a common mistake though. Both mating surfaces must be decked properly to accept an mls gasket.

I don't put any blame on the shop, should have checked my selfs for the surfaces to be in spec for the MLS.

I guess we can call this thread solved.

Thank you everyone for the responses, and suggestions.