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Old 06-19-2009, 10:10 PM   #1
SupraFeen
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Default Turbo Problem on Stock 94 Supra

I have a problem with my #1 turbo that started occurring only sometimes but now is a problem that wont go away. No matter what gear I'm in when I step on the gas, my #1 turbo starts spinning normally with normal power but almost at exactly 3000 rpm is just stops way before #2 turbo starts. It almost seems like it completly stops at 3000 rpm with huge power lose but may start spinning back up a little between 3000 and 3800 rpms. Above 4000 rpms it seems like both turbo are back online like they should be. Any ideas what this could be or where I should start to troubleshoot this issue?
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Old 06-19-2009, 11:12 PM   #2
pwpanas
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Quote:
Originally Posted by SupraFeen View Post
I have a problem with my #1 turbo that started occurring only sometimes but now is a problem that wont go away. No matter what gear I'm in when I step on the gas, my #1 turbo starts spinning normally with normal power but almost at exactly 3000 rpm is just stops way before #2 turbo starts. It almost seems like it completly stops at 3000 rpm with huge power lose but may start spinning back up a little between 3000 and 3800 rpms. Above 4000 rpms it seems like both turbo are back online like they should be. Any ideas what this could be or where I should start to troubleshoot this issue?
It's probably a bad actuator, vsv, or electrical connection. Troubleshooting the operation of the oem twins in sequential mode is kind of tricky. I'd suggest reading up on the exact sequence of steps in the operation of the twins, and then use the troubleshooting section in the TSRM to diagnose the problem.
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NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.
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