Ok yesterday I installed a supercharger kit on an 08 cobalt with the l61. Last night we had a little bit of difficulty finding a proper diagram for the 6pin to 8 pin conversion but we finally figured it out and got the car running. When putting the car in reverse it dies, but the idle is fine. Its not rough at all. We go on a quick datalog run and the car ran very smooth. Today he calls me in the morning saying he got to work and that his car started to run like a lawn mower at idle and die. He says there are no CELs..... at first I thought vac leak but it would've been doing that since last night. When he called me he turned the car on and it sounded like a very bad lawn mower. Also sounds like this over the phone.

1994 camaro rough idle problems - YouTube

 

I'm not 100% knowledgable on this abd this may be a dumb question but was it tuned for the supercharger after the install?

 

yeah, it was tuned

 

Try and catch the car with a datalog from idle to stall. This should show what's happening. Could be in the tune or could have something hooked up incorrectly.

 

yea thats a good idea

 

Update

I went to where the vehicle is, and turned on the car. From my experience of vac leaks I figured that was the cause of our troubles. The fuel injector rail was not bolted down on one side. So I tightened it and now all is good.

 

If only everything was that simple!

 

thats what i was gonna recommend checking. i had bad injector seals and my car sounded like this



i sounded cammed