I just bought a Stage II upgraded 2006 Cobalt SS/SC. 93 octane fuel or 89? Let me know what you guys think
-Thanks

 

91 or higher /thread

 

Yep premium for sure

 

Go for the super dooper 93 octane fuel.

 

highest you can get. and i hope you weren't putting in 89 before stage2

 

Not highest you can get. Some places sell 114 octane and absurd things like that. If you aren't tuned for it, don't go higher than 94. Personally I use 93 because no one around me sells 94.

 

im stuck with **** 91 on the west coast

 

Stage 1 and Stage 2 REQUIRE a minimum of 91 octane, with 93 octane recommended. If you put 89 octane in the car you will get knock, and lots of it.

 

This statement is quite obvious.

But then again... someone would have probably asked... lol..

 

Then again, running 114 might just make the car bias toward the high octane table "that much". :P

 

its kind of a given when someone says "highest you can get" that they mean, highest you can get out of regular octane grades at the pump. 87-89-91-93

 

Run that sweet corn oil

Disclaimer: Please do not unless you have 80's and are tuned for it

 

I suggest 100 Low Light

 

Go with the 93 and be safe dont put that garbage 89 in it

 

Alright thanks guys, I was running 93 but just wanted to check. Now does anyone have any ideas what may cause my car to have check engine light on with codes P0068 and P0069? Kinda happened out of the blue, wasn't even running it hard.

 

P0068 Throttle Body Airflow Performance ECM, PCM
P0069 Manifold Absolute Pressure - Barometric Pressure Correlation PCM

Almost sounds like your throttle body might be on the fritz, or maybe just the butterfly is sticking. Were you doing normal driving when it happened, at idle, or at WOT?

 

Ya I was thinking throttle body too. It was just replaced and that could have something to do with it. Anyway I was making a U-turn and gave it about half gas enough got up to about 8lbs of boost and just went limp on me. I shut it off, she ran decent except for idle on the way home. CEL was still on. I gave it some gas a bit later after driving, it stuttered at 10lbs of boost then went limp again. . . .

Thats when I read the codes, wrote em down, and deleted em with the OBDII reader. CEL is off now but I think the problem still exists. Havent gotten into boost since then. . . so it might be gone but I doubt it

Thoughts?

 

93

 

Hey my car is throwing the same codes and I am down here in south Fl, I clean my throttle body twice a year. Does your car have an aftermarket intake sysytem.. My mechanic tell me that my 6week old aem dryflow filter is shreeding..
sorry for the thread jack...

 

Not a problem
I have the stock intake, only upgrade is the GM stage 2. Turns out, after erasing the codes, unplugging and replugging in some wiring harness stuff, the car is running fine. I drove her around and without any problems, even peaked at 15psi.

Also I used to live in Coral Springs ahaha

 

where at in the springs area? I may have seen you around.

 

It is possible that the TB harness may not have been plugged in all the way, that could definately cause that problem.

 

Ya probably that cause now everything is good.