Bored tbs and obd ii

Canada · Post by **Canada** » Tue Mar 26, 2002 9:23 pm

Any of you OBD II guys installed a larger throttle body? I'm just curious if the computer went ape-#### with the added diameter or not.

I think I'm goning to go with a 56 mm, I don't think the next step up (61 I think) isn't worth the extra $100. I plan on get atleast the upper intake ported, maybe the lower one to. I don't think I can switch the lower manifold myself, due to the lack of a good shop to use. So I'd have to get it done by a shop, which costs more money. How many hours would it take a good shop to swap them?

Chris88CL · Post by **Chris88CL** » Wed Mar 27, 2002 9:11 am

You shouldnt have a problem with the increased throttle body size as long as the TB you buy has spots for all the sensors (IAC, TPS etc).

Chris
ICQ: 10833817
AIM: Chris88CL
lezarch@hotmail.com

Canada · Post by **Canada** » Wed Mar 27, 2002 9:36 am

On the 3100, is there any difference between the OBD I throttle body and the OBD II throttle body?

Nafterclifen · Post by **Nafterclifen** » Wed Mar 27, 2002 11:01 am

I believe all the sensors are the same. However, the plenum has a different EGR but you don't need to worry about that. Also, some throttle bodies have the coolant lines on the bottom and some do not. That's not a big issue though cause you can make a simple bypass hose and not have a problem.

Chris88CL · Post by **Chris88CL** » Wed Mar 27, 2002 5:53 pm

Really? The 3100 is like that too? I thought it was just the quad 4. I guess ya learn something new everyday

Chris
ICQ: 10833817
AIM: Chris88CL
lezarch@hotmail.com

Guest · Post by **Guest** » Thu Mar 28, 2002 11:29 pm

Our 62mm TB for the 3100 does not affect the OBD 2 operation. You may need to disconnect the battery for a night so the ECM can adjust to the extra air. Every OBD 2 car I have worked on have been fine with the bigger TBs.

Guest · Post by **Guest** » Sat Mar 30, 2002 1:46 pm

For the lower your looking at 6-8 hours. At least 400 bucks I'd say. Cheaper to do it yourself for around 60 bucks and clean and fix all the little things you come across too. A shop wouldn't do that or even gareente they connected things in the right order. They may for instance put on some part before connecting a harness, and then just pull and "stretch" the harness to connect and not put it back in the correct order. Even GM dealerships will do this. Not all but I've seen it happen.

I'm doing a HUGE write up right now on replacing the lower intake manifold gaskets and all related stuff done durring the process. I suggest you get a chiltons and take a look at my write up and see if you want to do it yourself. It's not that hard just takes time.

Guest · Post by **Guest** » Wed Apr 10, 2002 3:38 am

It only took me about 20 minutes to take the upper and lower off it isnt really hard...

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