HALP! Supra smoking bad... Pics Vid Details ETC!

[CyFi6]

Well recently my supra started smoking very bad! I can't figure out why and need some help! The first time I noticed this was right after I did a pull to about 120MPH and came to a stop, when I took off from idle it let out a decent cloud of smoke, I didn't think much of it but since then it continues to smoke.

Engine specs:
7mgte rebuilt 15k miles ago
Probe forged pistons 1mm oversize
Cometic HG stock compression
ARP headstuds
57 Trim turbo ~16psi
MaftPro
550cc/walbro255lph/aeromotive fpr
Intake/intercooler/exhaust etc

Here is what I have found. Pulled the plugs and cylinders 1-3 are BLACK. 4-6 are normal. 1-3 pistons looked damp, 4-6 dry and normal. When revving with the oil cap off, there is a distinct puff of smoke that comes out.

Here are the plugs in order 1 through 6
http://img.photobucket.com/albums/v313/cyfi/Car/CyrusSpark10_8_11001.jpg
http://img.photobucket.com/albums/v313/cyfi/Car/CyrusSpark10_8_11002.jpg
http://img.photobucket.com/albums/v313/cyfi/Car/CyrusSpark10_8_11003.jpg
http://img.photobucket.com/albums/v313/cyfi/Car/CyrusSpark10_8_11004.jpg
http://img.photobucket.com/albums/v313/cyfi/Car/CyrusSpark10_8_11005.jpg
http://img.photobucket.com/albums/v313/cyfi/Car/CyrusSpark10_8_11006.jpg

Things I have checked:
Compression

1 - 175 psi
2 - 170 psi
3 - 170 psi
4 - 175 psi
5 - 175 psi
6 - 175 psi
​

Turbo - No shaft play or any evidence of leaking, no oil in exhaust downpipe and very little oil in the intake

PCV- Completely clear and unrestricted

Not losing coolant
I always overfill my oil, so I can't really tell if oil level is dropping, it still reads over full

Tried leaning out my MaftPro very far and it would still smoke from the exhaust

Fuel pressure looks completely normal -38 PSI idling with vacuum
Oil pressure is normal

Vacuum - Still strong - 18" hg at idle

Only seems to smoke when it comes back to idle after revving. The longer I let it idle the worse it will smoke when I hit the throttle. The smoke seems gray and honestly does not smell like burning oil, but I don't see what else it can be. The smoke from the crankcase concerns me.
Car still has plenty of power and runs great, if it wasn't for the smoke, I wouldn't know anything was even wrong.

Here's the video.... Sorry for the bad quality video/audio.

Warning - this is an emotional time for me. :biglaugh:
[video=youtube;VHNkGdm4n1I]http://www.youtube.com/watch?v=VHNkGdm4n1I[/video]

Thanks

 

[MKIIISupraGuy]

I'm gonna say you need piston rings.

Sent from my DROID X2 using Tapatalk

 

[Devin LeBlanc]

What color is it? Blue, Black or White?

Blue-ish=Oil
White=Coolant
Black=Gas

If compression numbers are what you say they are and it is oil burning (blue-ish) its going to be valve seals or valve guides.

---------- Post added at 06:06 PM ---------- Previous post was at 06:05 PM ----------

okay, never mind thats gas.. Your running WAY rich. All plugs should be white/tan.

 

[CyFi6]

So you think the first 3 injectors are leaking? How can you tell the difference between a fuel fouled plug and an oil fouled plug? After shut-down the rail does hold pressure, but eventually drops off, but I am not sure if it is because of leaky injectors or if it is because of the Aeromotive regulator, they don't seem to hold rail pressure very well. My wideband doesn't show a rich condition either. Can't really tell the color of the smoke too well, looks mostly grey. I know compression looks good, but the smoke from the crankcase still has me wondering.... any thoughts on this?
Thanks

 

[sharpsupra]

usually an oil fouled plug will misfire.....but yea those 1 st tree are way rich

 

[Devin LeBlanc]

I'd like to see a video of the smoke coming out of the oil cap? is there a lot of air coming out of it when you take it off? There should be absolutely no air coming out of it with the engine running. If there is you have bad rings or a cracked piston ring glan

 

[CyFi6]

I'd like to see a video of the smoke coming out of the oil cap? is there a lot of air coming out of it when you take it off? There should be absolutely no air coming out of it with the engine running. If there is you have bad rings or a cracked piston ring glan

http://www.youtube.com/watch?feature=player_detailpage&v=VHNkGdm4n1I#t=88s

 

[Devin LeBlanc]

hmm well still looks like its running really rich, and has a slight amount of blow by

 

[jonahs_supra]

hmm well still looks like its running really rich, and has a slight amount of blow by

agreed

the backfiring(little pops) when idle comes down suggest your running rich
id have injectors cleaned and checked

 

[89supracrazy]

Mine did some things similar to yours. When I reved to 4500 and let off it would smoke for about 5 seconds and then clear up. My problem was the turbo. You said that you had a little oil in the intake. I also had a little oil in the intake. Pulled the bottom of the intercooler pipe off and no oil came out. I also could not figure out why my car was blowing grey/white smoke. You would think it would blow blue smoke but I was wrong. I was thinking head gasket our something internal. Does it do it real bad on deceleration.

 

[Zumtizzle]

Turbo Vote here.

 

[Albert]

Pull the turbo off. see if oil is pre turbo or post

 

[Devin LeBlanc]

If it is rings and has blow by there will be oil in the intake tube and turbo as well

 

[JStoked]

^ plus one to Devin. Mine smoked like that when my ring in the num 3 pistion went out. The smoke coming out of the oil cap is defantly blow by sry to break the news to ya it should smell like gas mixed with oil. If so shut her down and start a rebuild. If you keep running it the gas gets in with the oil and breaks the oil down and will start chewing your cams and other things up. But that's just my idea on the prob I could be totally wrong.

 

[Devin LeBlanc]

And if its running way rich it will wash down the cylinder walls passed the rings causing scoring on the walls thus causing excessive blow by. Will also dilute and thin the oil with gas.

 

[supraguy@aol]

Do a leak down test. It might isolate the problem to a particular cylinder.

 

[cricketjoe]

if compression is 170-175psi can it still be the rings?

 

[raysupra]

lol unlikely if all the numbers at +\- 2 with the same amount of cranks I would probably rule out the rings.. and Devin had a good idea.. if you took the oil cap off you could possibly rule out valve seals...
I vote turbo also..
everytime you rev it your oil pressure increases and It could easily be leaking from the turbo seals seeping out and cooking the oil...

 

[CyFi6]

Thanks for all the tips guys, I still haven't figured it out yet. Some updates though...

Pulled the throttle body and 3000 pipe, not a single drop of oil in the 3000 pipe, inside of the pipe is bone dry, and oil in the intake manifold looked normal from the PCV, very little. Pulled the rail and looked through the injector holes. Everything looks very clean in there, but I did see some wetness on the back of #1 cylinder valve. The holes are extremely small so I couldn't see much. I swapped the injectors around, put the front three in the rear and the rear three in the front, put new plugs in, and I will see if the same 3 cylinders foul the plugs again or not.

I cleaned the accordion about a week ago, and since then I have done a number of full boost pulls, and when I looked at it now, there is practically NO oil in the accordion, so I don't think blowby is really an issue.

Also, today after decelerating down a long hill, I noticed a bit of smoke out the back once I entered the throttle again at the bottom of the hill. So far this is looking more like a valve seal issue, I will keep my fingers crossed.

And just to clear things up about the compression test.
It was done on a warm engine, throttle fully opened, all plugs removed, fuel/ignition disabled, and 6 cranks for each cylinder. I repeated the test once for each cylinder to verify the correct reading.

 

[Albert]

Cyrus, like I said, I can replace that rear seal no problem, if in fact its turns out to be the problem