is it possible to adjust the idle on my 85 trans am with a 305 and tpi with an auto trans . It idles at 600 and i want to bring it up to about 750-850 area .

 

Idle speed is managed by the ECM according to the parameters on your chip.

Time to burn a chip or buy an aftermarket one...check the DIY-PROM forum for info on chip burning.

 

are you serious , , this is bs, theirs no little screw like a carbed car i can just turn and raise it . this blows .

edit: i have a hypertech thermomaster chip btw but i still would like to rasie the idle.

 

On the drivers side of the throttle body there is a torx screw that adjusts the position of the butterflies at idle, and therefore idle speed. However, things aren't as simple as opening up the butterflies with the bolt. The ecm plays around alot with the IAC which also has an effect on idle speed. You can try and play with them some, just make a note of how it was before in case you run into any driveability issues. An improperly adjusted IAC is known to cause stalling on deccel, and opening up the throttle blades may or may not have the same effect. Give it a try and see how it goes.

 

Evidently GM, Ford, Honda, Daimler, Toyota, etc. don't know as much as you do about powertrain controls...they think letting the ECM manage idle speed and throttle air bypass is a good thing.

 

i dont , when i have enough time and money to do the engine swap its carbed all the way . Enough with this bs tpi . Who needs gas mileage when i drive like 3k a year . bs tpi.

 

Although I agree with you that the ecm should have less control of idle speed, I also feel that most DIY mechanics don't know what they are doing (and quite a bit of shop mechanics as well). With that in mind, it doesn't sound like a bad idea all together to give the ecm control of idle speed.

 

Just like you buy a screw driver to adjust your carburetor, you buy your chip burning equipment to work on your EFI... I can change the idle speed from inside the car without ever opening the hood (oh, and I also never have to change spark advance weights or springs) (oh, and I never have to change jets or metering rods and springs) (oh, and I never have to move the accelerator pump rod position) etc etc... See where I'm going with this?? EFI > Carb.

You will spend as much money converting to carb as you would just buying the "screwdrivers" for EFI...

Oh, and with chip burning equipment you can change how much the ECM messes with the idle...

 

Gee Wiz thirdgen88, these cars have made you lazy, lol, afraid to get your hands dirty? I agree with the other fella, I think the computer controls too much, I really don't like computer controlled cars all that much, this is the first one I have had in over 20 years. I now remember why I have stayed away from them all these years. I still love my old muscle cars, I don't mind rejetting the carb at the track, not a big deal to me.
Although I would be lost without this site. Alot of good info here and helpfull people, I need that with this computer car, I am very old school and believe computers belong in the office, and I can barely use that silly thing too, it's all I can do to post on here and send e-mails, thats about it. I know I am lost in the 60's, but thats not such a bad thing for me. Keep the great info coming and I will do my best to keep this computer controlled car on the road. LOL later, Larry.

 

lazy? no... smart?? yes.

I've done carbs, and got really good at tuning them... I've found something better, so now I use it... What's so lazy about that?? Learning to tune EFI isn't exactly something a lazy person does...

 

Just messin with ya thirdgen. I tease some of my buddies all the time at the track that tune with a lap top, they do the same to me, it's all fun.
I don't really consider either carb or fuel injection any better than the other, they both do a good job of metering fuel, just have to go about each one a little different, but the end result is the same. I agree you have to be smart to tune either one, the biggest problem for me with these new cars is just learning how to use the computer, the tuning is easy for me, I know what needs to be done, just doing it with a computer is new to me. Alot of people think carbs are so easy but there is much more to them than just setting idle mixture screws and playing with jets. Sure you can throw one on out of the box and it might run okay, but there is so much more to be had with carefull tuning. I tune other cars for people (carburator cars) drilling idle feed restrictors, pump squirters, pump cams, drilling power valve restictors, etc.... there is alot to it as I am sure you are aware. But once you get the carb right for the application, the throttle response is amazing, gas mileage is great etc... just like fuel injection. Don't get me wrong I like fuel injection, I think it has it's place too, I just have to learn how to use this computer to dial it in. Thats my biggest hang up right now. Anyway, I think we got off the subject here and I am sorry for that. As long as it burns rubber it's all good, right? take it easy, Larry.

 

Heres the factory method for adjusting idle speed on an 86 Corvette. Should be the same for your 85 Camaro. It works for my 88 IROC. Theres been other posts about this if it doesnt work try a search.