"Hanging" Idle - Stock 08 Manual Cobalt

[[email protected]]

I tried searching on this but wasn't able to find anything other than this problem exists on the factory 08 manual trans Cobalt's. This is an unmodified tune, the customer is complaining of the idle "hanging", took it for a test ride and it does in fact "hang" at higher rpm between shifts. It's a minor annoyance but he would like to have it corrected.
I tried modifying the Throttle Follower, Idle Coastdown Spark as well as the Clutch Fuel Cutoff enable temp but no dice.

Any suggestions?

Thanks in advance!

[Dayhoff35]

i had this problem with an 07 as well, havent figured it out yet. In for answers.

[Leafy]

clutch position switch.

[[email protected]]

clutch position switch.

Can you elaborate? Is the switch faulty or need to be adjusted?

[Leafy]

needs to be replaced. My friends car was suffering the same thing and that was the cause. It eventually threw a cel.

[imphat0260]

clutch position switch.

Don't throw parts.... Log the PID/Status bit.... That will tell you right away if the clutch pos switch is fine...

[stromboli86]

X2 on the clutch position switch

[Leafy]

When its a fsb, I wouldnt consider it throwing parts. I'm not sure its an fsb for the cobalt but it is for the trucks. And knowing GM they likely use the same sensor.

[imphat0260]

When its a fsb, I wouldnt consider it throwing parts. I'm not sure its an fsb for the cobalt but it is for the trucks. And knowing GM they likely use the same sensor.

FSB?? Also, it is throwing parts if its not properly diagnosed and confirmed.... Using the scanner to confirm its bad would not be throwing parts.....

[Leafy]

fsb=factory service bulletin.

[imphat0260]

fsb=factory service bulletin.

Never heard of an FSB..... Been a Double Master ASE tech with dealer for 15 years.... TSB (Technical Service Bulletin) is what the manufacturers refer to them as.... Regardless, you are referring to throwing parts... Matter of fact, there is a bulletin about FIX IT RIGHT THE FIRST TIME..... That means properly diagnosing (which seems to be a hard thing now a days ), not just guessing until you find a part that works...

[[email protected]]

Thanks for the info folks (and the entertainment!). I do not have the customers car on site. What is the PID for the clutch switch? The commanded and actual TPS goes to zero when you lift to shift.

[Dayhoff35]

anyone figure this out?

[Frogstofall]

Forgive my ignorance but have you cleaned your throttle body plate? Had this problem on another car and that fixed it.

[S2H]

I just did a little thread cleanup...I just deleted a bunch of garbage and bickering that has no place on this forum
Keep it clean...or as my parents would say..

imphat0260...
Leafy....

Dont make me have to reach back there and separate you two while I'm driving