Got a few problems, need help...

I dont know what it does. I'm thinking it is something set by the factory that is not suposed to be changed. If it is adjustable it should be in the EFI section of the manual. Mitt has posted a few pics of an AFM opened up down in the technical section but it does not show what that screw does.

 

Alot cheaper than an AFM at around $700 US.

An O2 sensor new from the dealer should be around $150 US

 

For a 3sge engine the O2 sensor part number is 89465-29275 if you want to phone the stealership

 

O2's make a huge difference if they are broke.., ive got 3 spares at my place, but im not sure if they are functional, not worth the trouble of the long distance shipping

 

What kind of MPG are you getting, it will probably jump up a lot too when you switch a new O2 in.

 

If the hardware was missing inside then the T VIS would be open all the time. It is more likely that it is not opening when it should and that would certainly reduce top end power.

I will try to get you some pics of what is back there that you will be messing with

First thing I would do is rig it to stay open all the time just so I could test drive to see if there is more top end power you will loose bottom end power with it open but if you notice more top end power then you could check the T VIS system more thoroughly.

 

Something to check if you haven't yet....

The ECU...

I couldn't figure out why the hell my car was running like shit, had a flat spot at 6500rpm.....

Turned out the ecu's O2 output was bad or something, replaced the ECU, ran BEAUTIFULLY......so.....yeah...might wanna give that a shot?

 

This is pretty much what you would see if you were underneath the car looking up. Hopefully your T VIS is sealed to the intake manifold a little better than mine.

I think you'll pretty much have to work from underneath the car so remove 1 or both crossmembers to gain access.


This is a 165 intake manifold so it may be slightly different but the T VIS is from a GTS.


You are interested in the mechanical mechanism in the green box.


Watch out for little plastic $en$or bit$ that like to break off. If your going to remove the intake / T VIS you should remove these $en$or$ first. If the hoses attached to the $en$or$ are brittle or stuck cut the hoses. Hose is cheap $en$or$ aren't.


A close up of the mechanical mechanism. There is a little "C" clip (yellow arrow) that holds the vacuum actuator rod on the T VIS. It would be a real bugger to remove/ re install so just leave the whole thing connected. You should be able to manually move the actuator rod back and forth thus pivoting the T VIS mechanism which will open/close the valves.

So make sure the actuator shaft is free to move in/out of the actuator.
Move the actuator rod out as far as possible (green arrow) and find a way to prevent the T VIS mechanism from rotating backwards and closing itself and give the car a test drive and then verify that the T VIS is still wedged open when you return. Remove any modifications you made to hold the T VIS open and let me know what happened.

 

If you disconect the hose going to the actuator (green arrow) then the T VIS should stay in the open position. The natural position for the actuator is to be open. When a vacuum is applied at the green arrow it is stronger than the spring inside and the actuator closes and that in turn closes the T VIS valves.

So try to get your hand up there and make sure the little rod moves in and out of the actuator. It should be in the out position but you should be able to push it in and when you release it it should spring back out.

If that is okay and the rod moves then the easiest way to keep the T VIS open is just to disconnect the hose but you should plug the end of the hose with a golf tee or small bolt as that unplugged hose is like a vacuum cleaner and will suck any crud it can find into the intake.

 

Ya real fun .....PITA

Lots

Its allways nice to know how something is suposed to work when your trying to diagnose problems with it.