2010 Cobalt Having Issues Shortly After Bumper to Bumper Expires.. Need Advice
I'm a long time lurker here since I've got the Cobalt in August 2012, and I have been enjoying the site immensely. You all have beautiful cars that I would love to try match the looks one day. Sorry that I haven't involved myself in this community, but I don't bring a lot of knowledge.
Anyways guys, here are my issues that I've been having.
2010 Cobalt LS 2.2
1. My MPG is down by a lot. I'm Canadian and I don't use the MPG system, but I'm averaging about 10.2-10.4 Litres per / 100KM (this number will drop on the highway) and I only got 417 KM's on my last full tank. When I first got my car it was amazing on gas. Roughly about 530-540 KM's depending on my driving.
What could possibly cause me to lose over a 100 KM's to a tank?
2. Additionally, since I've discovered this issue, I have noticed some other problems. Once in awhile the start sounds a little rough for a split second. Like the grinding of chains for a brief, brief moment. Doesn't happen all the time.
3. When warming up the car and throttling minor RPM in Park, the car will return to idle, but RPM throttles weirdly in doing so, and once in awhile, for a split second, feels like it could actually stall, but stabilizes. Once the car hits the road it feels fine. It doesn't feel like a major issue, but it doesn't feel right.
4. Once in awhile when driving, the RPM will just die for a split moment, then rev right back up. Such as when I'm stopped at a Red light and it turns green. Once again this doesnt happen often, but its a weird sudden loss in power. I'll have to double tap the gas at this point.
So I'm wondering what this could be? I'll try and give you a few answers as to what I've done with the car as well as what others have said it could be.
I've been running premium gas through the vehicle in the last 3 weeks as well to do whatever I can to help the engine. I heard this will burn hotter, and help clean. So why not?
I got the car at 19,000 km August 2012. Its now at 54000 KMs. Its been through oil changes every 4k-5k KM's and on my most recent change I flushed the system.
Friend said it could be air filter (which I havent changed), fuel filter, winter gas, O2 sensors, spark plugs need cleaning etc.
But I'm on a low budget and have no idea where to start? Air Filter?
EDIT: Forgot to mention bumper to bumper has expired, but I have power train warranty until December 2015. And I'm fairly certain powertrain is not going to help me here.
Thanks in advance to anyone that can help.
Last edited by AcidiC; 03-08-2014 at 12:32 PM.