Problem with TB upgrade?

[DSMULATOR]

I put a 63 mm TB on....it was bored and did the half shaft mod (62.5). It felt that when the plate is shut it kinda sticks, like it wasn't bored out perfectly. I installed it, set my BISS and it get some idle surge. It drops off when i put the clutch in and then recovers, and then surges from 800-1100. Is there any way to test, using DSM Link, if the plate it sticking open enough and the TPS is sensing that and causing the injectors to make the car surge?

I have disconnected the coolant lines to the FIAV but left both that and the ISC in the TB. I have tried disconnecting the ISC and the problem persists so I didn't think a block off plate would solve it. Its a new Mitsu OEM TPS. No boost or vacuum leaks. Rebuilt motor.

Edit: I am running a GM MAF with MAFT. If low amounts of airflow with the E3 16G at idle thru the MAF is the problem, can anyone running this set up chime in?

 

[the1cov]

You used a TB off a 1g right, You do want to use a block off plate i had to do the same thing, If you need me to explain I can, but you can use a aluminum soda can as the block off plate it has worked great for me, no problems except I have to hold down the gas peddle a little when starting, and stay on a little bit until it gets warm, when warm you might also have to tap the gas each time you start it. your car might be different (every car is). All this is because you took off the coolant lines I perfer to keep them off. you might want to put them back on.

So yes a block off plate does matter, its not your injectors.

 

[DSMULATOR]

I actually used a 2G TB I believe, because it had the same number of vacuum ports on the top of the TB as my old one and the ISC plug fit right in. I'll get the block off plate and see what happens.

 

[the1cov]

Yah havent really messed with 2 g's but a buddy bought a 1g TB off me for his 2g and came back for an ISC as well. I cant find it but if I remember right the 2g TB are only like 52 mm and the 1g is 60 or 62mm. You should try the aluminum can, works great if you went and did it now it shouldnt take more than an hour all together. Either way let me know how it turns out.

 

[DSMULATOR]

Well it is a 62 mm so maybe it is a 1G. Did you just cut and unroll the can and trace the FIAV and make your own block off plate?

 

[the1cov]

Sure did works great last long time, used a permanent marker and siccors( way forgot how to spell)

 

[DSMULATOR]

that doesn't have to hold boost pressure?

 

[voodoogsx]

I put a 63 mm TB on....it was bored and did the half shaft mod (62.5). It felt that when the plate is shut it kinda sticks, like it wasn't bored out perfectly. I installed it, set my BISS and it get some idle surge. It drops off when i put the clutch in and then recovers, and then surges from 800-1100. Is there any way to test, using DSM Link, if the plate it sticking open enough and the TPS is sensing that and causing the injectors to make the car surge?

I have disconnected the coolant lines to the FIAV but left both that and the ISC in the TB. I have tried disconnecting the ISC and the problem persists so I didn't think a block off plate would solve it. Its a new Mitsu OEM TPS. No boost or vacuum leaks. Rebuilt motor.

Edit: I am running a GM MAF with MAFT. If low amounts of airflow with the E3 16G at idle thru the MAF is the problem, can anyone running this set up chime in?

You should be able to see the throttle voltage and percentage in dsmlink. You may need to add that to the stats that you are tracking.

Manually make sure that the throttle is closed all the way as well. I had some binding when I had my tb bored out, after adjusting the butterfly valve stopper and the throttle lines, my binding issue cleared up. I'm not sure about the surge though.

 

[DSMULATOR]

I've logged my tps volts and its like .49v at idle and almost 5v WOT.

 

[the1cov]

I wish I wasent in Iraq right now. Or I could just go in my garage and look at 1 to refresh my memory. But if I remember right the 4 wholes 2 on each side of the throttle plate have to do with the ISC. Since you disconected the coolant lines the ISC is going crazy. Once you put the block off plate on there their will be no need for the ISC, considering the ISC will then be blocked off. Once you do this the idel will be better.

I can go further if you need me to.

Just trace it out and sandwich it between like a gasket ( cant remember if I used RTV or not its been a while). If you go start your car now you should hear what sounds like a boost leak, if not at idel, throttle up with your hand you'll hear it sucking air. It didnt make scence to me either at the time but it did the trick. Or you can put the coolant lines back on and you wont have the problem.

I also did all this on a 1g but it shouldnt be different for a 2g.

 

[Laysher91]

Did you check if the throttle plate was sticking when it was off of the car before you installed it? If so, you can rule out it being the actual TB and look for things that would cause binding while its on the car. If your TB has a idle position switch for the butterfly (on the top of the TB), then its a 1g, if not its 2g. Make sure you have the correct TPS, 2g is a four pin I believe...check your wiring harness to see if your sensor has the same number of pins. And yes, the wrong TPS will plug into the right harness with ease. Good luck!

 

[turbosax2]

I've logged my tps volts and its like .49v at idle and almost 5v WOT.

The idle value sounds too low. It should be 0.63v. Adjust the tps by loosening it's screws and turning it until DSMlink reads .63v. Once you have done that, check the wot voltage. This should be around 4.6v. If it isn't, use this method to adjust it.

BTW, I find it easier to log ThrotPos instead of TPSvolts since it gives a 0-100% value instead of volts.

 

[the1cov]

Your problem is not your TPS. Trust me put the block off plate on there, and then mess with the TPS.

 

[DSMULATOR]

Did you check if the throttle plate was sticking when it was off of the car before you installed it? If so, you can rule out it being the actual TB and look for things that would cause binding while its on the car. If your TB has a idle position switch for the butterfly (on the top of the TB), then its a 1g, if not its 2g. Make sure you have the correct TPS, 2g is a four pin I believe...check your wiring harness to see if your sensor has the same number of pins. And yes, the wrong TPS will plug into the right harness with ease. Good luck!

Ok so my TB has no sensor for the butterfly, so then it is a 2G like I thought. Being so, all I have seen is 1G block off plates, so do I have to make my own or will one of those work?