oil smoke on throttle release??

[DR. EVIL]

Smoke on throttle release??

Smokes after idling for a minute or two, and continues to smoke...
doesn't smoke during acceleration....
doesn't smoke during boost....
smokes after I let off the gas from acceleration....
no oil in up-pipe/throttle body....
car had been run some on low oil level (synthetic), now fresh full synthetic and new filter.....
started happening within the last couple days, before the oil change, got worse after oil change....

any other info needed to diagnose problem?

does this sound like a PCV valve problem?
what would allow oil to burn during deceleration, but not acceleration?

PLEASE HELP!

 

[azgn]

sounds like a turbo seal.....sorry

 

[DR. EVIL]

my stock turbo started blowing oil into the intake

bought the TA-51 from Precision Turbo and was told that what caused the stock turbo to blow that seal would not happen on the new one.... and as a precaution, I got a BOV on my up pipe to keep the unused compressed air from entering the turbo again backwards......only been using this turbo for about a year now.

thinking its something on the exhaust side?

 

[DR. EVIL]

anyone I could e-mail about this?

 

[DR. EVIL]

TTT

 

[DR. EVIL]

now even worse....

took the car around the block.....

started out not really smoking at all.....
hit it and it broke the tires loose and seemed to pull strong....
boost was a couple pounds lower than normal
then at a stop sign I noticed some white smoke, still feeling normal driving though, and hitting it.... but it's smoking like a freight train now... white smoke....still clearing up during acceleration

checked oil... no anit-freeze in it... still the right color....

 

[DR. EVIL]

ttt

 

[b4black]

what would allow oil to burn during deceleration, but not acceleration?

When your idleing or decelerating, the engine is under a lot of vacuum, which can suck oil from the turbo through the seals. It wont'/can't do this while accelerating with boost pressure.


Call Precision and talk to Harry.

 

[Nocooler]

Did you take off the return line and clean it out when you changed the turbo? I'd start there.

 

[Ken H]

I had the same problem with our white 87 limited. Turns out the oil return line I was using was obstructing the return of oil. This caused a back-up against the turbo therefore pushing oil out past the turbo seals. The return line I was using - Eastern Performance - would kink the hose about half the way down to the block. The opening was only about 1/4" , and was a flat opening not round. I replaced with a stock unit. The smoking stopped. Went thru three turbos before I figured this out.

If you are using the stock return line already, make sure it is not clogged. This will happen especially if it is a high mileage original unit.

HTH..........Ken

 

[VIN7]

Take off the downpipe and look at the exhaust wheel and inside of the dp. Also, check the thrust on the turbo shaft. My TA-49 smoked like that and the intake side was dry, but the exhaust side is where it blew out.


Mike

 

[DR. EVIL]

okay, first of all, thanks a lot for all the replies so far...

To answer a few questions.... the original turbo blew an intake seal... started sending oil into the throttle body.... bought the new TA-51 from Precision about a year and a half ago.... and only had the turbo on the car for about a year now. The oil return is stock 67K original miles, not sure, could be clogged... it leaks very very slightly though....

so no thoughts of it being a headgasket or something right? I'm getting boost, so that means no total loss of compression... so I didn't think gasket either.... I'm running purely 100 octane right now too.

When I got the oil changed, they said it was about a quarter of a quart over... but my rear main leaks ever so slightly so I didn't think it would make that much of a difference... but does it??

Right now I have a problem.... one of the allen head bolts in the THDP sheared off when trying to take it off the head of it broke right off! so I can't get the damn downpipe off..... not sure where to go from here.... HELP!

if its a turbo seal... and oil is involved... why is it white now instead of blue?

 

[GS70350]

if its a turbo seal... and oil is involved... why is it white now instead of blue?

Perhaps because you are using synthetic motor oil. it often burns white, like steam, instead of the bluish gray that you normally see with the other stuff. I used to run el cheapo 78 cent motor oil from wal mart, think its called super tech. then during the summer of this year my TA49 started to smoke some under boost and when you let off the throttle after boost, mainly. Under boost you couldnt see it, unless it was night time with headlights behind you. try that. thats when i noticed it, also, it burns oil, a quart every few hundred miles and i go really easy on this thing. but i switched to mobil 1 synthetic 15-50 and the smoking on warm start up and regular driving quit, but under boost and after letting off, it still smokes, however its white not blue. you might want to remove your intake pipes and stuff, and feel for a oil film. i can see in the turbo outlet, a vortex of oil film, its actually pretty cool to see : ). my oil return line has not been replaced or cleaned, and it leaks a little at the gasket by the turbo, im gonna remove it and check to see if its clogged, but i dont see how that big pipe would clog.

Also, why do my turbo seals NOT leak at 85 psi cold start up pressure? they will NOT leak. then when it thins down and gets to about 20 psi idle or so, and the engine is warm, it leaks. wierd that the higher pressure doesnt force the oil out through the seals.

 

[DR. EVIL]

I forgot about the oil being full synthetic.... could be the reason the color is not typical bluish..... I almost wish I had used normal oil so I'd know its oil smoke and not a ring or headgasket or something.......

any other insights on this?

 

[GS70350]

take off your intercooler or intercooler pipe, or turbo and check the turbo on the compressor side for oil film, even a very slight amount. rub your finger around inside. you can stll remove your THDP with a broken bolt. i did. one of mine broke as well but it still came off and still went back on fine. check the exhaust side, and check the oil return line. I HIGHLY doubt its a head gasket. i think the turbo seals are leaking. check those 3 things and do a compression test on all cylinders and report back to the board with the info. might help get you some more specific information that could be of use.

 

[DR. EVIL]

you're right on the downpipe still being removable, I'll just have to completely unbolt the bottom and top both and pull it off the broken stud.... probably can get the stud out with some pliers when the DP is out of the way...

already checked the intake side for oil, no film or indication thus far.

Think this would be a good time to upgrade to the .85 exhaust housing?? (assuming the turbo is the problem of course)

 

[DR. EVIL]

guess what kids? very good hypothesis on the cause of my smoke..... unfortunately.... now I have to pay to fix it

would ya like to see the "problem area"?

Turbo pics

just for kicks.... here's the whole car.... in its turbo "prime"

The car

going to work on removing the turbo pretty soon... and removing the downpipe for cleaning.....

Think PTE will let this slide considering my warrenty was only up less than 2 months ago? I'm my birthday in 9 days for heavens sake

 

[DR. EVIL]

TTT

 

[azgn]

I would have a "chat" with them

is there a chance anything got into your oil? Like some detonation? (it eats at stock head gaskets.....graphite is NFG in a turbo.......)

 

[DR. EVIL]

I suppose something could have, never know, cause its not the oil, full synthetic everytime.....

I need to figure out a cause though.... not putting that turbo back on until I know whats causing this.... happened last year to the stock turbo, blew an intake seal and started force feeding oil...

guess could be a clogged up oil feed.... don't know of other causes yet.

I just pray for sympathy on my warrenty date