Well I was driving my sisters cobalt today and it is all stock and it feels like its a hell of alot faster then mine and I have a shift controler, cai, and a cat back but hers is noticably faster, then I noticed the the pedal on my sisters it is tight and repostive and mine is loose and the rpms wont even climb till the pedal is 1/4 pushed in so I think the TB isnt even opening all the way am I right?

we both have LT's

 

Really weird you mention that, I have the same thing in my SS/SC. Pedal doesn't feel responsive at all and it won't respond until you've got the pedal a good piece in. It's more than just drive-by-wire lag.....it's just a total lack of pedal response. I don't know if it's something to do with the throttle position sensor or what, but it's a noticable difference.

 

Im going to talk to the tec at the dealership its going in for the second time. But its really wierd because when I was in my sisters car I floored it out of the rutters parking lot, and I had to wheel it around because of tire spin. My car wont do that. even back when I had continentals.

I love this car but I havent made up my mind yet to trade it in on a ss/sc or pay this car off in a year and put a 350hp ecotec in it. because a civic would kill my cobalt the way it running.Thats how slow it is right now.

 

i've felt the same thing... if i floor it, it takes a second, but then the rpms start climbing quickly and it gets loud.. first time my brother was in it he asked if i had a turbo...

 

Thats just because it an automatic this is differnt. But when you drive is there like a dead spot at the begining of the pedal were the motor does nothing. Because my pedal doesnt make the motor do any thing till 1/4 throtle. And the pedal is mushie.

 

THAT delay is normal and is just kind of something you have to live with in drive-by-wire cars (electronic throttle control).

I know exactly what the OP is talking about but it's difficult to explain. It's like take that split-second lag and then imagine when it does finally start to kick in it just bogs for a while. As he said in the first post, it's like the throttle body isn't opening up fully.

It has nothing to do with power or boost or anything, it's just unresponsiveness in the throttle.

 

That's incorrect about the throttle response. When I installed my 2-piece pedal set I took off the GMPP performance air cleaner assembly, put a mirror over the throttle and made sure the pedal and throttle moved together. I was surprised to see the throttle move as fast as I pushed down on the gas pedal. When I "floored" it, it was uncanny how fast the throttle responded -- as if it was connected with a cable (did it with the key on and engine NOT running). I would take your car to the dealer to have them check the switch on the pedal assembly. When I floor my Auto 2.2 LS I get nearly instant wheel spin -- in fact yesterday I sat next to a coworker on the way home from work and I got antsy -- floored it next to him and surprised him with about 10 feet of wheel spin. Today he accused me of lying when he said I must have a manual Tranny "cause 4- bangers with automatics and front wheel drives don't spin tires like that". I educated him by letting him look my Cobalt over.

 

Drive a manual and you'll see the throttle lag. Its there.

 

Drive-by-wire lag exsits in all cars, but it's not something that should be overly noticable.

When I floor it I get wheel spin also through 1st and 2nd and on a good day 3rd. Hell when I floor it runs just fine. However, drive-by-wire lag is NOT the problem we were talking about. It just takes more pedal travel and the pedal isn't as firm as it should be.

 

EXACTLY.

And drive a Volkswagen for even more throttle lag. That's the most noticable car I've ever seen throttle lag on.

I have a few ideas about how to fix my problem, but I want the dealer to do all they can do first before I mess with it.

 

I know what you mean -- I said I get nearly instant throttle response -- not instant . On the street, manuals always take off quicker because of the .5 sec lag of the torque converter unless you "jump the gun". However on the dragstrip, flooring an automatic when the last yellow light comes on evens-out the lag -- that's why you'll find automatics usually hold a slight ET advantage over the same class manual cars in their respective NHRA class.

 

Exactly I have compared two cars and the pedals and power are noticable differnt and I didnt put $1000 into my cobalt so far to have it be slower than a stock one. So thats were im coming from.

 

Take off your air cleaner and watch the throttle when you move the pedal -- if there truly is no movement when you first move your pedal then there is definitely something wrong.

 

ive got a 2.2 5 speed...i can get the tires to spin all the way into second. no throttle lag on this car.

 

Point is, regardless if it's an automatic or a manual the electronic throttle should not have a noticable lag. The automatic's "lag" should only be due to the converter.

 

Wow your online indicator says your invisible.

 

That's not really the issue, not when it opens so much as the rate at which it opens. The lag is there like normal, but the PROBLEM is that the response is slowed, there IS response but not as much as there should be.

When it comes down to it, I think it's either a TPS problem or there's just too much play in the pedal itself and the TPS isn't getting an accurate reading.