Wastegate?

drmmr15 · 01-09-2007, 05:06 AM

I believe my wastegate is stuck open. How do I fix that? Do I have to replace the wastegate actuator? I just bought an '87 Turbo, and the turbo doesnt spool. I can get it to about 1.5psi, but thats it. I had a friend block the exhaust off, and the car had a steady leak from the wastegate area. It's enough of a leak that the car didnt die even when the exhust was blocked off. I was wondering if this is an easy fix. Thanks.

drmmr15 · 01-09-2007, 06:14 AM

After checking out the amazing TSRM, I'm pretty sure its the wastegate. I am going to check it with a Turbo Pressure guage, but I am pretty sure the rod connected to the wastegate valve is stuck open. My question is: in the TSRM, it says to replace the Turbocharger assembly if the rod doesn't move. What exactly is included in the turbocharger assembly, not including the turbo, because the turbo is fine? Thanks.

Look Here

IHateHacks · 01-09-2007, 04:30 PM

"I had a friend block the exhaust off, and the car had a steady leak from the wastegate area"

If the wastegate is stuck open it would not created boost BUT it will not cause an exhaust leak, the exhaust gas would just go around the turbine wheel and out the O2 housing, downpipe etc.

If you are getting an exhaust leak then I'm afraid you have either a blown turbo to manifold gasket or a cracked turbine housing. Or since you said you bought it like this correct? The idiot that worked on it last could have broken a stud or stripped the threads on a stud causing it to leak.

drmmr15 · 01-09-2007, 06:37 PM

Im sorry, the reason I think its the wastegate stuck open is I couldnt FEEL an exhaust leak, but I could hear a steady hiss coming from that area. This leads me to believe that the wastegate is dumping into the O2 housing a bypassing the turbine, making no boost. Does that sound correct?

Edit - Wait, so it must be an exhaust leak, youre right. Otherwise, even if the wastegate is dumping into the exhaust system, the car should die when I block off the exhaust, unless there is a large leak somewhere. I think it could be the turbo to manifold gasket. I hope the turbo isnt screwed. I'll diagnose the problem further. Thanks for the input.

drmmr15 · 01-09-2007, 09:38 PM

To replace the turbo to manifold gasket, do i have to remove the turbo?
Also, if I have to replace the wastegate actuator, do I have to also replace the Turbo? Is it easy to replace the wastegate actuator and rod? Thanks.

IHateHacks · 01-10-2007, 02:21 AM

"To replace the turbo to manifold gasket, do i have to remove the turbo?"

Yes you do. How else would you replace the gasket in between the turbo and the exhaust manifold?

It's really not a difficult job, you just have to remember where everything goes, and hope you don't break any studs or bolts. These cars are 20 years old and things that have been together that long don't like to come apart.

"Also, if I have to replace the wastegate actuator, do I have to also replace the Turbo? Is it easy to replace the wastegate actuator and rod?"

No you don't have to replace the turbo to replace the wastegate acutator. Once you have the turbo off it is very easy to replace the wastegate actuator and rod. Actuator is bolted on, rod is held on by a tiny C-clip. You will need a pair of C-clip pliers and I'm sure the clip/rod/actuator is a dealer only item. Turbo must be off the replace the wastegate actuator.

Where about do you feel the exhaust leak? Can you hear it while in the car driving? If not can you hear it while you are under the hood and someone else is reving it?

01-09-2007, 05:06 AM	#1
drmmr15 3" Exhaust Join Date: Jul 2006 Location: Seattle, WA Posts: 73	Wastegate? I believe my wastegate is stuck open. How do I fix that? Do I have to replace the wastegate actuator? I just bought an '87 Turbo, and the turbo doesnt spool. I can get it to about 1.5psi, but thats it. I had a friend block the exhaust off, and the car had a steady leak from the wastegate area. It's enough of a leak that the car didnt die even when the exhust was blocked off. I was wondering if this is an easy fix. Thanks. __________________ 1987 Supra Turbo GReddy TT Open Element Filter (<---not sure what brand) YAY BOOST!!!!....finally...

01-09-2007, 06:14 AM	#2
drmmr15 3" Exhaust Join Date: Jul 2006 Location: Seattle, WA Posts: 73	After checking out the amazing TSRM, I'm pretty sure its the wastegate. I am going to check it with a Turbo Pressure guage, but I am pretty sure the rod connected to the wastegate valve is stuck open. My question is: in the TSRM, it says to replace the Turbocharger assembly if the rod doesn't move. What exactly is included in the turbocharger assembly, not including the turbo, because the turbo is fine? Thanks. Look Here __________________ 1987 Supra Turbo GReddy TT Open Element Filter (<---not sure what brand) YAY BOOST!!!!....finally...

01-09-2007, 06:37 PM	#4
drmmr15 3" Exhaust Join Date: Jul 2006 Location: Seattle, WA Posts: 73	Im sorry, the reason I think its the wastegate stuck open is I couldnt FEEL an exhaust leak, but I could hear a steady hiss coming from that area. This leads me to believe that the wastegate is dumping into the O2 housing a bypassing the turbine, making no boost. Does that sound correct? Edit - Wait, so it must be an exhaust leak, youre right. Otherwise, even if the wastegate is dumping into the exhaust system, the car should die when I block off the exhaust, unless there is a large leak somewhere. I think it could be the turbo to manifold gasket. I hope the turbo isnt screwed. I'll diagnose the problem further. Thanks for the input. __________________ 1987 Supra Turbo GReddy TT Open Element Filter (<---not sure what brand) YAY BOOST!!!!....finally... Last edited by drmmr15; 01-09-2007 at 08:15 PM.

01-09-2007, 09:38 PM	#5
drmmr15 3" Exhaust Join Date: Jul 2006 Location: Seattle, WA Posts: 73	To replace the turbo to manifold gasket, do i have to remove the turbo? Also, if I have to replace the wastegate actuator, do I have to also replace the Turbo? Is it easy to replace the wastegate actuator and rod? Thanks. __________________ 1987 Supra Turbo GReddy TT Open Element Filter (<---not sure what brand) YAY BOOST!!!!....finally... Last edited by drmmr15; 01-10-2007 at 12:39 AM.

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01-09-2007, 04:30 PM	#3
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	"I had a friend block the exhaust off, and the car had a steady leak from the wastegate area" If the wastegate is stuck open it would not created boost BUT it will not cause an exhaust leak, the exhaust gas would just go around the turbine wheel and out the O2 housing, downpipe etc. If you are getting an exhaust leak then I'm afraid you have either a blown turbo to manifold gasket or a cracked turbine housing. Or since you said you bought it like this correct? The idiot that worked on it last could have broken a stud or stripped the threads on a stud causing it to leak.

01-10-2007, 02:21 AM	#6
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	"To replace the turbo to manifold gasket, do i have to remove the turbo?" Yes you do. How else would you replace the gasket in between the turbo and the exhaust manifold? It's really not a difficult job, you just have to remember where everything goes, and hope you don't break any studs or bolts. These cars are 20 years old and things that have been together that long don't like to come apart. "Also, if I have to replace the wastegate actuator, do I have to also replace the Turbo? Is it easy to replace the wastegate actuator and rod?" No you don't have to replace the turbo to replace the wastegate acutator. Once you have the turbo off it is very easy to replace the wastegate actuator and rod. Actuator is bolted on, rod is held on by a tiny C-clip. You will need a pair of C-clip pliers and I'm sure the clip/rod/actuator is a dealer only item. Turbo must be off the replace the wastegate actuator. Where about do you feel the exhaust leak? Can you hear it while in the car driving? If not can you hear it while you are under the hood and someone else is reving it?