yeah i already have the manifold and throttle body for the 2.4..just holding up on installing it till i have the correct info..will i need to visit the dealership after installing these parts or will diconnecting the battery put the computer into learn mode and it will reset itself..not sure how these cars work yet..can someone answer this..what is best.i already have parts now i need info

 

ok...
1. you can put on the manifold with no tune as long as you use the 2.2 tb...

2. if you use the 2.4 tb (alot bigger) you will need a tune

3. there is a rumor that the jet maf will correct the problem but its not guarranteed by any means


if i dont go s/c then i will be doing this in spring...thats right i dont have this done....but i have done my research for the most part and these are the answers i have found to the same questions you have...good luck bro

 

u will prolly need an aftermarket tune. im pretty sure if u take it to a dealer u MIGHT be able to tune the ecu as a 2.4l engine, but they will void ur warranty (if that bothers u). but aftermarket is better. i would say hold off on installing the tb, install a full exhaust and 2.4 manifold, and then get a tune for all of it.

 

that is..IF the dealer will tune it, let alone have someone capable...not all of them do...they dont like to reflash vette computers when someone gets a bad tune and just wants back to stock...

i would call trifecta if you want adecent tune, thats who everyone raves about anyway lol

 

Thanks for the help guys.i have a local place that does gm tunes ill give them a call...

 

Well i swapped the 2.2 mani for the 2.4 this weekend.anyone after installing without reseting the computer have issues with idle being high.mine is sitting right below 2000 rpm...i was just wondering since i kept my factory 2.2. Throttle body on if anyone else ran into this problem...
Im getting bigger injectors and putting the 2.4 throttle body on right before i go to get it tuned before the o.c.c. Car show...

Any info would help.

 

Aw man...why is everyone leavin my man hangin after his install?? lol I was thinkin about doing this mod too. I figured this was a 'trouble free' mod. I guess u gotta get a tune to drop the rpms???

 

well i talked to a gm tech yesterday and he said the fluctuation in rpm is because i never reset the computer and the difference in air space and vaccum pressure from manifold to another is different. Or could possibly be a vaccum leeak.im going to mess around with it more tonight after work.ill post my findings tommorow for you peeps..lol

 

i would say it's almost definitely a vacuum leak.

 

You have a vaccume leak. The computer is trying to change the tune on demand and the leak is messing with the a/f ratio. Take the manifold off and put it back on.

 

agreed