Originally Posted by Angel

Ok, I have been one of the thousands of victims of the horendous idle problem with my 07' Cobalt SS Supercharged. I do have many mods including the Stage 2 upgrade along with the K+N Typhoon Cold Air intake system and exhaust and many more. I noticed shortly after installing the Stage 2 kit that my cars idle was bouncing at idle and the problem got worse and worse to the point whereas I was stalling in traffic. I was forced to basically ride my clutch like nobodys business and it was just plain annoying. Pulling up to a red light and people looking at me thinking I was a young 16 year old wanting to show my ride up cause my rpm was consistentally bouncing from 400-1400. My fuel mileage has progressively gotten worse and it had started to become a safety issue considering I was almost t-boned as I rolled through a downhill stop sign trying to beat traffic but my car stalled again!!!

Anyhow, I am aware that there are many other balt owners out there who are experiencing the same problem as myself and I have seen what others were trying to do to fix this god aweful problem with no prevail. I have been working with the head GM tech in my city here for a while now to see if we could finally put this issue to rest. After months and months of monkeying around and ruling almost everything out except for a possible computer error in the car that wasnt tripping any codes which would be unlikely I thought to remove my throttle body to have a look. Just for the record all of you cobalt owners this is soo simply a blind monkey can remove the throttle body. Simply remove your intake and the throttle body is attached with 4-10mm bolts and 1-Vacuum line and 1-Electrical connector. Once removed I noticed that I had a bit of gunk in the body(not a significant amount and keep in mind my car have only 5k miles on it) but I figured I would give it a good cleaning with a $5 spray can of throttle body cleaner and then clean right around the valve(keep in mind when you open the valve be very gentle when cleaning to avoid any unwanted strain or possible damage). Once this minor operation was finished I reinstalled everything back to normal and fired it up and HOT DAMN!!!! Back to normal baby! Everything is running 100%. No more funky butterfly idle problems and my gas mileage is back to normal.

I cant believe I didnt figure this out long ago but s**t happens I guess. Anyhow, I know many of you are going to be wanting to jump all over this and fix your own problem but read this before you do. I dont like just fixing problems and saying "great its done" I want to know what caused this considering the car is so new with so few miles on it??? Im not 100% sure but I would assume it has alot to do with the filter being mounted so close to the ground and possibly some oil from the K+N filter and mabye some other debris happen to make its way up which would be strang but no impossible. My only possible solution to this rather than doing this cleaning every 5k miles would be for all of us to install oil catch tanks to allow some of this crud to remove itself from the intake and then every once in a while remove the vacuum line on your intake while the car is running and give the hole in the intake a quick spray of the throttle body cleaner.

Ohh and for you wanting to know why this problem was doing what it was doing is simply this - when there is any type of crud or oily compound around your intake valve and the valve may possibly stick a bit the vehicle recognized this and sees that it is sticking so it rushes to correct and overcorrects causing the valve to be opened to much and drops quickly causing the fluctuation from anywhere from a couple hundred rpm to 1500 rpm or so. I hope to god that this helps hundreds if not thousands of other owners out there who have been experiencing this problem because it drives us CRAZY!!! and I was near ready to go buy a gallon of gas and a match if a solution didnt come along right soon. Anyhow, please post replies once this is tried and let me know. I am very very curious as to how many people this is going to help.

Originally Posted by skymike83

First i apologize for replying to this post with a different question, but for some reason i cannot make a new thread with my question. I dont know if this is because I am a new member or not. anyways i will make this as short as possible.
My car is a 2006 sup charged..

I am new to this forum of course and a new owner to the cobalt ss/sc
I have had the car for about a week now and i am having a check engine light which is throwing off 3 different codes. codes--- p0017,p0068, and p0300.

So the mechanic told me to do a tune up, which i did and it did nothing.

I dont know who had the car before me so i do not know what mods are on the car or at least to what i see right now. The car only idles once in a while but when i sit at a light i can feel the car shaking and when i open the hood the engine is shaking as well. And when i push the car hard usualy on 2nd or 3rd gear the car will display reduce power and eventualy make me pull over to the side. I have to shut it down and wait a few minutes for it to reset it itself before i turn it on again.

Some of the mods that were on the car when i bought it"
---Injen intake
---billet-flow pulley 2.900 red in color.
I am not sure about the injectors if they are stock or not, but i can see the color is lime green on them>>

Since then i have added a megan exhaust myself.
The car is boosting 20lbs when i push it hard which scares me. I have cleaned the throttle out and there was some oil there as well.

Every mechanic keeps telling me different things im so confused and i dont know much about this car. IF anyone can help me or point me in a directions i would really appreciate it.... I live in the metro detroit area but im in the dearbon heights area if anyone would like to meet up...

Originally Posted by skymike83

i have cleaned it already before i even read this post, im thinking the tune is wrong

How do i know if i have stock injectors in the car??

Originally Posted by quikdcride

i have a question ok so when anyone is reving their engine say you rev it all the way to redline right
and then it drops back to idle but then it will rev up by itself to about 1500-2500 for a few seconds and then drop back down to idle
has anyone ever experienced this?

Originally Posted by quikdcride

i have a question ok so when anyone is reving their engine say you rev it all the way to redline right
and then it drops back to idle but then it will rev up by itself to about 1500-2500 for a few seconds and then drop back down to idle
has anyone ever experienced this?

Originally Posted by nizzle

Mine only started doing that when I put bigger injectors in. I got a boost reference fuel pressure regulator and had to have Vince from trifecta tune mY idle surge out. But now the surging is gone. However, my throttle body did go COMPLETELY out on me about a year and a half ago. It would kick me into "reduced power mode" in which I could barely get the car to accelerate. I thought is was just the cleaning thing too but after I cleaned it, the problem was still there. I replaced the throttle body and problem solved. So basically I am agreeing with everyone in saying that our cars do have throttle body issues.

Originally Posted by Edubs

Just a note, I'm not sure what everyone is using, but I would recommend using just a silicone spray. You can get a can at NAPA for dirt cheap. Please don't use MAF or CARB cleaner...