when you have the a/c on and you pull up to a light or something and it acts like its trying to die when your sapsoed to be idleing?? it will jump from idle to about 1200 or so then fall to about 3 then back up to 12 ect.... then finaly levels out so far i can only tell it does it with the a/c on

 

It's a tune issue, alot of Cobalt do it... There is supposedly a reflash available thru the dealer to correct it

PS. Moved to Problems & Service

 

It should not be that dramatic when the A/C is on. I can feel increased engine vibes but the RPM is stable at normal idle speed.

 

Try to see if dealer will reflash computer. Then clean your air filter (if you have CAI--if not, replace air filter), then clean your throttle body and MAF. These things turned my car from barely running to like-new.

 

i have a brand new cia about 2 weeks old and what would i clean the maf with just a lint free rag? as far as the retune ill just wait on that hpt just shipped and waiting on it. after i get my car out of gm for the 3rd time in 2 weeks....


PS sorry i got it in the wrong section

 

They sell MAF cleaner at most autoparts stores

 

great ill have to go check that out but i got time.....

 

Right after I put my intake on, when I shift from drive to park, it will jump to 1,000, then fall to 500, then go where its supposed to be. Did it a lot right after install. Now not so much.

 

u did unplug battery for 10 min after doing a power mod correct?

if not slap urself, regain consciousness and go do it lol

why u let the computer relearn everything

 

Dont worry to much. Its standard cobalt operating procedure.

 

No, I dint, instructions dint mention. I figure that it will learn as I drive it. Its only the GMPP anyway.

 

It will learn as you drive it. Its just learns quicker if its got no previous records.

 

Thats what I thought. It seems ok now. Idiling issues are not new to my car anyway. I also like the sound starting at 3,000 now. It atleast it sounds faster.