I'm pretty sure blue smoke on deceleration is caused by leaky valve stem seals or a PCV problem.

If your rings were bad, you'd get smoke on acceleration. Thats the way I've always understood it.

later,
Curt

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Well, to eliminate crank pressure, could I replace the hose from the rear vave cover to the front with another hose, put a T in there and run my boost gauge to it? I would think it would give me a good idea whats going on unless I'm missing something important. If rings are bad I'll see a large pressure increase under acceleration?

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1991 Stealth RT/TT

I think Curt may be on to something here.



Be careful -- that hose is like a special hose. I tried using a radiator hose of some such crap and all it did was deteroiate and leak. I eventually just bought a new one from stealer. I forgot it had the big bend in it.

I'd try changing out the PCV valve -- inexpensive.

SJ

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Wouldn't VSS be on both accel and decel?

And wouldn't rings smoke a bit at idle, too?

Can't you just eliminate the stock PCV valve when you have crank vents installed the way he does?

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~Joe - aka spider gear destroyer
'94 Stealth R/T
-Lightly Modded ;)

Time for a compression test.

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06 Blue EVO 9

Compression test has been done, cold we got around 120psi on both banks, +/- a few psi per cylinder, this was done just a week ago by Jeff after new headgaskets.

PCV Valve is new, its inline with the krank vent.

Heads were redone the same time the block was done, 3rd gen lifters etc.


As for the boost gauge hooked up to that small valve cover to valve cover tube, it'd be very temporary, one run around the block at most.

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1991 Stealth RT/TT

Humor me for a minute.

Datalog your IDCs & IPWs when you completely let off the throttle. Let me know what number you see.

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06 Blue EVO 9

I'll have to do it when I get back from Philly this weekend.

On another interesting note, I took it out for a spin w/ that boost gauge hooked up to the valve covers, stayed at 0psi, was probably not connected well.


I pulled in the garage and reved it up a few times, I noticed a little blue smoke coming from that back of the engine bay. I looked under the car to see if it was coming from the downpipe leak but it didn't look like it. Also under the area where it was smoking is a small puddle of oil or anti-freeze, it sure feels slippery though. I thought it COULD just be a bad exhaust leak, but the puddle says otherwise. Its not a ton but something is leaking back there, and im not sure what.

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1991 Stealth RT/TT

I wouldn't expect too much psi that way.

My point was sometimes you can get a bad PCV valve -- been der, done dat.

However, sounds like you found your issue.

There is a line that runs anti-freeze through the throttle body to warm it up quicker whence it's cold. Not being exactly sure where you are talking, this could be it.

You sure the PCV hose from the y-pipe to the rear valve cover is hooked up right?

Is this area too high for either of the turbo lines?

SJ

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PCV from the rear valve cover to the 'bubble' is currently connected, just for shits and giggles I disconnected the krank vent inline with that hose.

I didn't see any visible leaks around the throttle body FIAV. I slid one of those large blank CD spindle cover things right over the spot on the floor. Hopefully I'll catch whatever fluid is leaking and track it down from there, I have a good idea that its oil though. We'll see..

EDIT: I'd like to mention aswell, this smoke is visually coming somewhere from the rear of the engine, and out the tail pipes.

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1991 Stealth RT/TT

Greg, et al -- clogged turbo line that blew?

Wow bro, you've got a good one.

We'll figure it out.

Jeff -- you out there?

SJ

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Philly is about 45 minutes from me. I'll be there this weekend doing work on a friends car.

There shouldn't be any boost and very minimal vac under the valve covers.

Well, forget the injector thing. If oil/smoke is coming out the rear exhaust manifold while it's running, you definitely have a failed oil seal somewhere.

You never did mention if both turbos spin freely.

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06 Blue EVO 9

Yea, I need to pop off the pipe and see whats up, I'll do that now actually, exactly 'how' freely should it spin?

Edit: Rear turbo spins freely, I don't notice anything odd. The saft has no play, I could move it side to side of back and fourth.

I also checked the cup, nothing there after a few hours, must be only when the car is running that it starts leaking.

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1991 Stealth RT/TT

It's coming out the exhaust and inside the engine bay? This is unusual to say the least. And only after you let off from boosting?

so let me get this straight, your running oth the krank vent and the PCV valve...? stop that. one is a replacement for the other, not an "ok, we'll run both" thing.

do you have it plumbed inline, or in a "y"?

The PCV valve, and the krank vent are the same thing, just a dumb check valve. one is cheap plastic, and the other is suppose to be a better metal equvilant with precision manufacturing which will hold back more boost for cars running more than 15 - 18 psi.

so if you hook it up:

|intake tube| ------ |PCV valve --->| ------ |krank vent ---->| ------ |valve cover|

It's like running two oil filters. which some poeple would say is good because you getting extra filtration, but others would say is bad because you may be dropping oil pressure to much across both. but back to your thing.

you now have to have BOTH check valves working properly for the system to function. if one or the other is stuck, you car will blow oil on decel.

so first. take one or the other out.

if your running them in a "y", show me how, because I'm not gonna guess.

next.

the puddle. any stains on the back of the engine? Did you re-use/leave the oil return line in the back turbo alone?

could be a leaking oil return line which drips on the exhaust? that should make smoke any time the rpms are up though.

I would also think that the VSS would leak any time the oil pressure is high enough to push oil past the bad seal, or any time the RPM is up.

Your problem sounds like the PCV valve/system is not working, your pressurizing the crankcase/valve covers, and it's blowing oil past the rings, which is running it through the engine, and out the tailpipe...

but the leak adds new dimensions... sooOOoooo

do step one. then check back.

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