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Discussion Starter #1
Background info: Car has 52k miles, has been BPU for 3k miles. I was getting onto a freeway on ramp and gunned the car so I could merge with the traffic. The second turbo kicked in at 1 BAR. Around 6k rpm, I heard a hissing sound, more like something leaking then a BOV sound. Then the boost dropped to .6 BAR.

On the way home, I noticed the first turbo would not boost over .4 BAR. Car barely rev past 3k rpm. If I try to push it past that point the car stutters (felt like a fuel cut) and black smoke would come out from the exhaust.

The car still holds perfect idle and vacuum. I heard no death whine. My immediate conclusion was that an IC hose must have popped off.

I checked the IC hose. They were all tightened. I couldn't get to the one below the intake so I figure I would have Toyota check it out for me.

I got a call from Toyota and they said they couldn't find anything. The service manager suggested my 1st turbo might be bad, but he will need to keep the car to run further diagnostics.

My question is, if my first turbo is bad, wouldn't I hear the infamous death whine? Also, I have always thought black smoke coming out from the exhaust is correlated with popped IC hose? Or am I mistaken?

-Rudy
VR RX-7 TT
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52,000 miles (3k bpu).....blown turbo......NO WAY. You had to of popped off an intercoller pipe. Most Toyota dealerships don't know jack about supras anyway.
The loose pipe must be the one that you couldn't get to. Do you mean the one below the intake manifold or next to the intercooler? Take out your batter if you have to......to check the ones by the intake manifold.
Jack up your car and take off that platic water shied(if it is there) and check the pipes by the intercooler.
Also....make sure the vacuum line didn't pop off you bov.
 

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YOu probably ought to have black smoke coming out of your exhaust if you popped a hose, but I doubt that you blew up your turbo, they don't just stop working all of a sudden.

You most likely blew a hose, or your VSV's may not be working. I would lean towards the first and obvious one. Check all of your connections.

Good Luck!
 

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Humm...My car smokes..it has 82k miles and it stock as a rock. So it may not be a blown turbo? When you first crank it up..it makes a weird ass whinny noise , but then it stops...So it may just have popped a hose?
 
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Discussion Starter #5
Also if you don't see a i/c hose popped off. Check your i/c end tanks. I had one of those pop off. It does the same thing as a loose i/c pipe. Car wouldn't stay on or idle and was spewing out black smoke. It scared the crap out of me...As everyone stated its probably just a i/c pipe...
 

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Like the guy above said, it's possibly your IC end tank. I've been up and down with my IC in the last week. I took it out to clean it and when I put it back in it blew the endtank on the outside off. From then on, it wouldn't stay on at any boost level over 5 psi and wouldn't hold it either. More then likely that is what your problem is. Jack the car up, take off the water shields on the bottom and the plastic liner on the front fenderwell in front of the passenger front tire. Check all of the hoses and connections and tighten all of them while your down there. My guess is that it's your IC. If it is and your end tank is off then don't even try to re-use it, just buy a used one from the For Sale section for 100 bucks.

Hope this helps.

Matt
 
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Discussion Starter #7
So if it's the IC end tank or the IC hose, the car would have rough idle and spew out black smoke even when the car is at idle? Because right now, the car idles perfectly and the vacuum shows a perfect -47 (according to my Blitz DSBC). Also, it doesn't spew out black smoke unless I try to get more than .4 BAR or rev past 3k rpm.

The car is still at the Toyota dealership, but I'll definitely get it back tomorrow morning and check all the hoses again. Thanks for all the help.

-Rudy
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I would probably get my car the hell out of the toyota dealership. Most of the time they don't know squat about Supras. If you can't find the fix yourself, you need to find a competent mechanic in your area. The car idling OK is the only thing that makes me think it is not an IC hose. Mine ran like crap when the intake IC hose blew but as others say maybe it is your IC. Good luck.
Barry H.
 
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Discussion Starter #9
A friend of mine had the same problem, where it seemed like he popped an intercooler hose yet the car still idled fine. we found out that one of the hoses had physically burst. So at idle it was fine but the minute he boosted the crack in the hose would burst causing problems. Check the hose above the intake. There is a sponge thing there. Check under the sponge to make sure there are no cracks in the hose.
 
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Discussion Starter #11
1/4mile in style, thanks for the tip! Come to think of it, my RX-7 had the same problem a couple of years ago. A crack formed on the IC hose. I couldn't see it, but whenever the car boosts past .5 BAR, the crack would widen, causing a loud hissing sound. The RX-7 uses a different system (MAP vs. MAF), so the car simply runs on N/A mode when there is a major boost leak. Whereas on the Supra, car would spew out black smoke and run like something is seriously wrong with it.

Nick, the car is not broken. Don't worry, I'll fix the IC hose problem this week :)

-Rudy
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When my endtank popped off, it idled fine and drove fine until 3k RPM also. But once it got up to about 5 to 6 psi it wouldn't hold it long and start sputtering and spewing black smoke. I'm 95% positive it's your endtank. If not, then it's a crack in one of the hoses. The very bottom hose is hard plastic, so it's probably not that one. But get it the hell out of the Toyota dealership and do it yourself. You might learn something about your car while your at it. :)

Matt
 
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Discussion Starter #13
What kind of BOV do you have. I know that when I put in a new BOV, and took out the stock bov and put caps in it's place. Same thing happened to me, I gunned it and then all the suddent hissing, I mean MAD hissing and no boost. It just happen to be when I was installing the BCC, I thought it was something with the BCC. Turns out I lost one of the caps, and ended up putting the stock bov back in. Just back track, eliminating the possibilities one at a time.
 
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Discussion Starter #14
Hey does the car stink really bad, like burnt oil.? i just replaced my turbos last week and the number 1 turbo was hoofed . when i took them out the first turbo the shaft was broken and was filling the exhaust with oil, causing the black smoke. The car still idled fine i drove it home and still had oil in the car. I f not i would think it was a vacuum line or a ic hose. If its the turbos they are cake to change i had mine out with new ones in under 3 hrs... that included checking all the vsv s and the vacuum lines... if you take out the turbos give me a yell i got some killer pointers that make the job easy.. i had mor trouble almost with the oil filter.. haha..
 
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Discussion Starter #15
I found a hair line crack on the bottom intercooler pipe (the hard plastic pipe). Don't know if such a small crack would cause that much drop in boost, but a leak is a leak and I'll replace the pipe and see if that fixes the problem.

-Rudy
VR RX-7 TT
Blk/blk Supra TT
 
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