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Old 04-08-2002, 11:47 AM   #1
Jewbaru
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Default Uh, Oh: Lots of smoke at the autocross.

Just as the car is getting better.

Yesterday was the 3rd event for the region, small course highlighted by a quick slalom off the start, and a LOONG decreasing radius left turn(which is key).

On my first 3 runs, nothing seemed abnormal. It's the first time the car's been under good boost at part throttle, so with my street tires, it was a handful (but fun). On my fourth run, when I let her rip off of the line, out of the corner of my eye I saw smoke. I looked up in the rearview and saw the car puked a huge cloud of light bluish smoke (burning oil). I let up right away, and cruised thru the rest of the course.

I pulled off into the pit area and started poking around under the car. We started it up, and checked out how much smoke was coming out. Under idle, there was very little, but it was there, when I revved, huge clouds came out. First thing I did was take off the filter. Inside of the tube there was a LARGE amount of oil pooled. The tube was coated with a nice thick layer, and there was a fairly large puddle at the bottom of the tube. So, I disconnected the tube from the turbo compressor, and inside the turbo there was a ton of oil as well. Next off was the charge pipe going from the turbo to the intercooler. It had a nice coat, and there was a pool of oil resting on top of the compressor outlet. There was also a pool of oil inside the elbow connecting to the intercooler.

We cleaned the pipes out, connected the filter to the silicone IC hose, and started the car. We gave it a rev, and the turbo shot out a TON of oil. Looked really cool, but it showed how much oil was actually there. We did a quick test with the PCV(?) hose, and the other crankcase hoses to see if there was blowby. There was none. Aside from the oil coming out of the turbo, there was a bunch of smoke still coming from the muffler.

So, off came the intercooler, and, of course, there was a large amount of oil puddled inside the throttle body, not to mention all the oil in the intercooler (the IC was put in my trunk, and when we pulled it out, it had leaked oil all over everything). We started the car with nothing on the TB, and gave it a few revs, still got smoke. So we rigged up an intake with the intake pipe and filter, and let the car idle for a while thinking it may be just a large amount of oil puddled inside of the intake manifold.

When we revved it later, the amount of smoke was MUCH less than before, but we were still confused as to what was going on.

So, after a while, we decided I might as well hook everything back up, and drive the car home, but I should take it easy. By now it was raining, so it was hard to see smoke from behind the car, but I didn't see any while I was driving. Same with this morning, there didn't seem to be any smoke except for your usual cold/wet weather white smoke.

There were a few theories from different autocrossers. Some thought it may be a toasted ring, but there was no blowby, maybe a burnt valve, but who knows, the amount of smoke eventually decreased, by ALOT (down to probably nothing). A Neon owner said at high RPMs sometimes the intake manifold sucks oil thru the PCV on his car, we looked at mine, and the PCV is connected to the intake, AND the intake manifold. He thought it might be that. Another thought was the flat motor was spilling oil into the intake (which was helped by the vacuum the turbo creates), and was being sucked thru the motor. Maybe the long left was helping, and it eventually gathered enough to start smoking pretty heavily. Like I said, going around that turn, I was under full boost, part throttle, and it was a hard left. Another thing that may "backup" that claim was that on my third run, people said the car spit a large amount of blue smoke going around that turn.

Regardless, I'm going to do a compression check, and pray nothing major is wrong. Also, a catch can is my next mod.
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Old 04-08-2002, 12:05 PM   #2
8Complex

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Default Re: Uh, Oh: Lots of smoke at the autocross.

Quote:
Originally posted by Jewbaru
Regardless, I'm going to do a compression check, and pray nothing major is wrong. Also, a catch can is my next mod.
What I was going to suggest, and what I was going to ask. You got it all covered, man. Keep us updated.
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Old 04-08-2002, 12:26 PM   #3
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I'm gonna guess a seal in the turbo.
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Old 04-08-2002, 12:36 PM   #4
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Quote:
Originally posted by blaster88
I'm gonna guess a seal in the turbo.
We checked the turbo, and it's fine. The car didn't seem to smoke when cruising thru the course.
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Old 04-08-2002, 02:29 PM   #5
HndaTch627
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Quote:
Originally posted by Jewbaru


We checked the turbo, and it's fine. The car didn't seem to smoke when cruising thru the course.
you won't see turbo seals leak(unless they are SUPER bad) until the car is loaded...look at all the mistu's that as soon as they hit boost their turbo seals just start to PUKE oil.

Good luck Joel

jeremy
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Old 04-08-2002, 03:41 PM   #6
Jewbaru
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When the car was loaded, there was no smoke (on the trip back).

A few mins ago, I had my coworker rev the car, and I stood behind it. No smoke, just your typical rich/cold puff.
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Old 04-08-2002, 04:51 PM   #7
subachad
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<<Stretch Theory of the Day>>

Perhaps while sloshing around through the turns, the oil return line actually had oil going UP it from the oil pan. This caused a backup in the line so more oil was going in, than out, so instead of the oil flowing down the drain, it was squeezed through the turbo so it forced oil through your intake. When you unhook the intake, you are eliminating the turbo and hence the oil burning up and eventually cleaning out completely.

This is what happened when I had a kink in my return line.

Chad
93 1.8T
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Old 04-08-2002, 08:04 PM   #8
boysetsfire
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same thing happend to me but it was just cause the oil return line wasnt steep enough
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Old 04-08-2002, 09:27 PM   #9
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Lots of reasons why it might do that.

Not the least of which is you PCV valve took a dump.

I would get a catch can ASAP. My 88 turbo would suck oil from the pass side valve cover all the time even with nothing wrong. When I got a exaust w/o leaks it would actualy pudle synthetic in the elbow going into the turbo. The brief time I ran w/o the PCV system stopped that in a hurry.
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Old 04-08-2002, 09:37 PM   #10
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Quote:
I would get a catch can ASAP.
Me too.
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Old 04-08-2002, 11:06 PM   #11
Graham
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Jewbaru, were you running a banjo bolt return or tapped pan?

I'm running the banjo bolt and it seems to work fine.....well no smoke at least.

Graham
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Old 04-09-2002, 11:26 AM   #12
Jewbaru
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Quote:
Originally posted by Graham
Jewbaru, were you running a banjo bolt return or tapped pan?

I'm running the banjo bolt and it seems to work fine.....well no smoke at least.

Graham
Tapped pan.

The engine bay REEKS of burnt oil from the BOV spitting it all over the place, and from all the oil that got all over the engine bay when we removed the piping. Another full day, and still no smoke. I gave it a hard run last night, and heard a strange whining noise. I thought it might be the turbo, but it sounded like a loose hose. I checked everything, and it turns out, I missed a hose clamp, and air was squeaking by under boost.

The car sounds normal, it drives normal, and there's no smoke coming from the tailpipe.
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