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Discussion Starter · #1 ·
Vacuum leak / Runs rough

Starts up and idols OK but stumbles when I try to take off until RPM’s over 3000. Or until the boost pressure is High enough then it will accelerate. I can drive it steadily if the RPMs are around 3500 or higher and smooths out. However, when I have to slow down, stop and gear down, again it stumbles really badly at low rpm when I try to get back up to speed. It's definitely running super rich. If I give it too much accelerator before it catches boost the CHECK ENGINE light comes on and I have to turn off - turn on to reboot and then it runs again.

Ran a smoke through sealed intake system to check for vacuum leaks.

Conclusion:

1. Vacuum leak at Intake Manafold.
This was detected from underneath the intake manifold . It is leaking out the Shaft that goes in and out TVIS Intake Divider Plate. The rod runs along there and opens those baffles which open for to alow air aflow. It is right below TVIS ACTUATOR.

2, leaking out of EGR valve also.

Anybody had experience with this issue? What's my options since there are no parts from Toyota?

Had the car since 2016 but this is my first post. I'm stumped
 

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91t gen5
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You can find the seals for the TVIS plate but they're only available in the complete engine gasket kit. Go figure they never made them available. Alternatively you could measure the seals and find replacements.

You could also delete the TVIS system which is what I would recommend. It sucks to delete this feature because it does help but finding a working TVIS actuator is difficult and it won't be long until it starts leaking again too.
 

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Discussion Starter · #4 ·
Thx J, elimination would be ideal with new plug and play OBD 2 ECU. What did u do to yours? And how's it working?
I'll b checking your previous post too.. Thanks again.
 

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Discussion Starter · #5 ·
Thx J, elimination would be ideal with new plug and play OBD 2 ECU. What did u do to yours? And how's it working?
I'll b checking your previous post too.. Thanks again.
I searched your past post and found where you got not with the holes welded closed. New to the forms but if I'm reading right that was in 2008 you've got some experience. I've heard there's a risk of detonation. Then I would still have a 30 year old EGR valve and TV is actuator. Did you go to a updated ECU OBD2 and eliminate all that? How did the project go?
 

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I searched your past post and found where you got not with the holes welded closed. New to the forms but if I'm reading right that was in 2008 you've got some experience. I've heard there's a risk of detonation. Then I would still have a 30 year old EGR valve and TV is actuator. Did you go to a updated ECU OBD2 and eliminate all that? How did the project go?
You can use a phenolic spacer, I bought one from ATS racing. Problem was my engine had a good bit of blowby and oil would leak through the phenolic material and drip on the garage floor. So to fix that I bought an original aluminum one with the holes welded.

I was using a gen3 st205 ecu at the time so the TVIS system was effectively disabled anyway. Now that I have swapped engines my gen2 sits in the corner of my garage. What OBD2 ecu are you talking about?
 

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Discussion Starter · #8 ·
You can use a phenolic spacer, I bought one from ATS racing. Problem was my engine had a good bit of blowby and oil would leak through the phenolic material and drip on the garage floor. So to fix that I bought an original aluminum one with the holes welded.

I was using a gen3 st205 ecu at the time so the TVIS system was effectively disabled anyway. Now that I have swapped engines my gen2 sits in the corner of my garage. What OBD2 ecu are you talking about?
In my limited knowledge since I've gotten involved in the joys of 90's turbo charged cars with limited OBD1 data and then referring to the PDF file, I've always wished I could update to OBD2. But I'm skeptical about being able to tune it. If I'm understanding this correctly here are a couple of OBD two choices. What do you think?

Link PNP ECU for 3SGTE - ATS Racing

Toyota MR2/Celica All-trac 3SGTE 1990-1992 MSPNP Gen2 Plug and Play ECU

Also, Im looking into spacer from ATS. Thank you!
 

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Generally you refer to those as standalone ecus. I really don't think there is OBD2 on these but I could be wrong. I think the link is a better choice over the megasquirt but they both require tuning. Basemaps are generally there so you can start your car and get it on a trailer to take to a tuner, or just enough to get started on a street tune if you want to DIY it.
 

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Discussion Starter · #10 ·
Generally you refer to those as standalone ecus. I really don't think there is OBD2 on these but I could be wrong. I think the link is a better choice over the megasquirt but they both require tuning. Basemaps are generally there so you can start your car and get it on a trailer to take to a tuner, or just enough to get started on a street tune if you want to DIY it.
Yes Standalone, thanks for the tip and all your advice. I've been researching your info. So if I eliminate the TVis system by installing this plate, I would definitely need to get an upgrade to Standalone ECU right? I worry those old ECU wouldn't work right without that TVis system on there.

I looked up Plate and the Gen3 st205 ECU(Celica or 3rd Gen SW20?) you were running on the Turbo 2.0L 3S-GTE. Besides your oil leak, how did it run with out Tvis?

I did find a 90s Japanese ECU rebuild specialist in Dallas, Relentless Motorsports around $300 give or take and. He guarantees it for three years if its virgin.

In case I forgot to say it, I'm just looking to get the car tuned for touring on weekend or a second car. No tracking.
 

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Yes Standalone, thanks for the tip and all your advice. I've been researching your info. So if I eliminate the TVis system by installing this plate, I would definitely need to get an upgrade to Standalone ECU right? I worry those old ECU wouldn't work right without that TVis system on there.

I looked up Plate and the Gen3 st205 ECU(Celica or 3rd Gen SW20?) you were running on the Turbo 2.0L 3S-GTE. Besides your oil leak, how did it run with out Tvis?

I did find a 90s Japanese ECU rebuild specialist in Dallas, Relentless Motorsports around $300 give or take and. He guarantees it for three years if its virgin.

In case I forgot to say it, I'm just looking to get the car tuned for touring on weekend or a second car. No tracking.
You don't have to have TVIS working the ecu doesn't care. I'm sure most of the gen2s out there don't have functional TVIS at this point. Mine ran fine without it, I really don't think it ever worked when it was installed. Like I said the diaphragms fall apart on the actuator because oil leaks down from the valve cover and soaks them.

You don't have to have a standalone for most bolt on modifications and even then you can get by with a few without worrying about the ECU.

I've heard of relentless but have no experience nor do I know anyone who has.

If you don't have to pass emissions you can remove the EGR system and install block off plates.
 

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I'll look in my garage, I think I had the seals sitting around. I did the delete myself.
I would send you the Phenolic spacer I have for the cost of shipping. Warning: I could never get it to seal for me. But I was also running a Jun Intake Manifold. Let me know.
I'm sure you can find a post or two on it from me.
 

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Discussion Starter · #13 ·
I'll look in my garage, I think I had the seals sitting around. I did the delete myself.
I would send you the Phenolic spacer I have for the cost of shipping. Warning: I could never get it to seal for me. But I was also running a Jun Intake Manifold. Let me know.
I'm sure you can find a post or two on it from me.
This looks like the best option for me however I can't deal with it for the next couple of weeks as my MR two project takes a back burner. I will be in touch and thank you for your suggestions.
 
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