Hey guys so my cobalt is having some really bad power issues.it lost a lot of power and now I can't drive it. And I need it for work tomorrow. It's throwing code p2440 sai check valve stuck, P0411 sai fault. And P0300 cylinder misfire. Im wondering could the sai fault cause major loss of power. Or am I experiencing ignition problems.

 

We need more info on your cobalt, I'm assuming it's a l61 or le5. Miles, mods, etc

 

Sorry, I was rushing. It's an L61 Ecotec. main mods are a cold air intake and cat back exhaust. Yesterday as I was coming back from work there was a moment when the car hesitated and lost alot of power. I took it straight to autozone to get the codes checked. On my way home from there I stopped at a red light and it did it again. I was lucky I was just a little away from home. I changed the sparkplugs because it was getting to that time. And the car ran fine for a while. This morning when I work up it did not idle right. The car stays on there is just no power and the idle is really shaky. I did a compression test. Fine. Fuel pressure test fine. Cleared all the codes and idled the car for 15 mins and the only code that came back was P0300 Random - Multiple Misfire detected.

 

SOLVED!!!! OBD Scanner was showing misfires on cylinders 2 & 3. The ignition coil for those two cylinders had failed. New Ignition coil pack, and the power has returned!

 

Good