OK, I've had the H.O. Manifold on the car for quite some time. I bought the flange from Chris Fontana and figured since I'm ripping the manifold off to put it on I'll tackle the job of putting on the bigger H.O. TB. Well all seemed to go as plan as I followed the HOW-TO on NY-JBodies website. Then I started the car... it Idled high as expected right at 1500 rpms with no check engine light. Well I cleaned up my tools while the car was idling and I noticed that it didn't go down to the normal RPM range. I looked and saw a check engine light. I figured it was nothing real major and proceeded to pull the car out of the garage. When I step on the throttle (even ever so lightly) the rpms will buck rapidly between 1-2k and never go above. Which sensor do you think I didn't install right? I put the 2.3 TB plunger for the Idle control sensor in my 2.4 sensor. I also put the 2.4 TPS on the 2.3 TB. Did I possibly do either of the 2 wrong or did I forget something all together.

Your symptoms sound very similar to the ones my car had...The NY-Jbody idea to adapt the 2.4 TPS sensor has since been debunked... People will tell you that you need the 2.3L TPS sensor...I will tell you that you need the 2.3L TPS sensor:

You need the 2.3L TPS sensor.


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"Youth in Asia"...I don't see anything wrong with that.

Thank you. I was all but a 100% sure it was that sensor. If I put the 2.3 TPS sensor on is it plug and play or do I have to switch some wiring to that sensor?

plug and play


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"Youth in Asia"...I don't see anything wrong with that.

Good info. I was gonna attempt this same upgrade in the spring. Once you get it running right, let us know if you noticed a big difference will ya?

No problem. Hey I really like the interior of the car in your sig uflip06. Is that yours? I. assume it is. Nice and clean with just a little color.

Me 2. I have the mani installed and a HO T/B sitting around waiting for the install. So you used the 2.3 TPS and 2.4 other sensor?

I tried doing the T/B swap when I did the mani but i couldn't get it to work. At that time I was told it was becuase I had the late 80's early 90's T/B but after reading this I think it was b/c I used either both 2.3 sensors or both 2.4 ones. Back then I even bought new 2.3 sensors thinking that was the problem. FYI if you take anything electronic out of the box Napa will not take it back.

So should I be good with the newer T/B and new 2.3 TPS and 2.4 other sensor?

PSN ID: Phatchance249

jack030 wrote:No problem. Hey I really like the interior of the car in your sig uflip06. Is that yours? I. assume it is. Nice and clean with just a little color.

Yes, it is my interior. I'm going for the "less is more" look...LOL.

Shawn McKenzie wrote:So should I be good with the newer T/B and new 2.3 TPS and 2.4 other sensor?

I think I ended up just using all 2.3L sensors...but yes: 90'+ 2.3L TB and 2.3L TPS for sure. I forget what the other sensor is, but I believe the 2.4L and 2.3L are the same anyways.



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"Youth in Asia"...I don't see anything wrong with that.

Well I swapped the sensors and I'm still having problems. The "bucking" of the throttle disappeared when I swapped the sensors but now I'm idiling at 3k and it doesn't go down. I can't really listen for any vaccum leaks when the engine is that loud. Should I swap out the Idle control sensor too?

Are the sensors for all the 2.3 T/B's the same? The sensors i got were for my older T/B, but since the the 2.4 and 2.3 ones are so close I would think all the 2.3 sensors are the same.

Sorry about your troubles jack030, my only thought would be if you got used sensors they might not be working properly.

PSN ID: Phatchance249

Well see, I'm still using my 2.4 Idle Control Sensor. Still seems to be idiling awfully high.

Sounds more and more like a vacuum leak man. You may not hear it but I would try to reseat the TB and or even the mani to see if you've got issues underneath. I had to do that with mine initially even though everything looked snug and I couldn't hear a leak. It's been good all year.

Yeah, that's my next step. I can't see it being anything else. Thanks for replying though man. I appreciate it!

Does everyone agree with me that I'm to use the 2.4 IAC (idle air control sensor) with the 2.3 plunger?

Alright, everything is working fine now! Here's what I know... I used all (both) the 2.3 sensors; TPS and IAC with 2.3 plunger. I had to manually set the plunger at a depth where it dropped my idle down to 900 rpm so I might have a bad sensor but everything seems to be alright and working!

Glad to hear you got it working. I just have one question, how do you "set" the plunger on IAC? Its been a while since i messed with the T/B sensors and i can't remember what that is.

PSN ID: Phatchance249

i screwed the plunger out as far as I could until it bottomed out and was still able to push the sensor in. It didn't start the first time I tried because it didn't let any air in at idle but the second time it fired right up and idled at 900rpms

I'm glad you got this fixed. I also did the HO swapout on my cavy. I feel I know quite a bit about this swap because I have done it so many times now. Wish I could of gotten on here sooner to help you. But to clear this all up for everybody;

If you are to use the 2.3l HO TB on the 2.3l HO Intake Manifold you are to use ALL of the 2.3l TB Sensors. It is the only way it will work, I have done the HO swap five times now and four times I used the 2.3l 56mm TB and all four times I had to use the 2.3l TB Sensors.

If youare to use the 2.4l TC TB on the 2.3l HO Intake Manifold you are to use ALL of the 2.4l TB Sensors. I have used the 2.4l TB on the 2.3l Intake Manifold once and used the 2.4l TB Sensors. It worked great. Hope this clears it up for alot of you that read this post in the future.




In the planning stage for an all American TRD Cavalier.

Hey Z24HO... well I thought I had everything fixed and running good but my car decieved me. I'm still having problems. It still idles between 1.5k and 2k. I'm running both 2.3 sensors on the 2.3 56mm TB. I'm starting to think one of them is bad. Could the TPS sensor be sending a signal to the computer which is then sending a signal to the IAC sensor telling it to stay opened? I was reading through some more forums and found that someone had used the TPS from the 95' Cav or Sunfire GT. Is that my solution?