Wow Im lost in words....

 

haha dude your car is fine. my car is doing the same thing. having a turbo or supercharger with an intake is whats mostly going on. the colder and more the dense the air the more boost you are getting. the mosr boost, the more gas being used and i think it also has alotttt to do with the type of gas they offer in the winter.

 

mine does it, I have to wait till the cat warm up cycles out, cause if I don't even when the car is up to normal temp for some reason it's drives weird kinda like the fueling gets messed up, I've felt it most when leaving from a stop, it feels like it's lagging then all of the sudden it goes and feel kinda jerky, pretty much if I don't wait until the motor temp is at least 100*F with the warm up cycle completed, or even if it's warmer than that if I don't wait for the warm up cycle to be done it will act up, something I've noticed when I get to my destination and turn the car off, usually about 15 minutes later, if I get back in the car, start it and drive off it feels normal, like everything resets..., but this rarely happens I normally wait until 120* before I roll out

 

mines reading 15.7MPG's

 

dude the little **** you notice about your car when its cold out wont happen when its warm out. cars just make funny sounds and act funny in the cold. it could be anything. something little. i guarentee u its just one of those things that scares you and then it warms up outside and it goes away and you forget allll about it

 

Really depends on what you drive more often. Personally I've probably put over 15000 highway miles @ 70+ MPH (I got pulled over in mine 3 days after I got it doing 129 MPH in a 55 MPH by a trooper and he gave me a warning because the road was empty)

But its true, Winter blends rob fuel economy because the air is denser and your air:fuel ratios suffer for it.

 

haha now were talkin

 

I am going to start writing down how many km's i drive for every half gas tank fill up. And convert it to miles, I am sure it is just the cold temperatures (more gas to start engine up) , snow (resistance) and other ficky little environmental problems.

 

My car says "12.6L / 100km" so 235 divided by 12.6 = 18.65MPG

So much for the 30+ zzz

 

+1. Last week when it was warm outside all I had to do was lightly rest my foot on the accelerator and my car would take off. It's great when the air is just the right blend between not too cold & not too hot.

 

I just replaced my spark plugs 70k ahead of maintenance schedule and it got rid of the sloppy idle timing crap I was going nuts about. I also looked at the leads of the plugs and instead of a flat cylinder it was a friggin cone shape and really white on the tip. The ceramic was rusting out. I did notice a very small (4-5MPG INST) gain on leaving the base at the speed limits.

I also was doing about 85-90 on a country road going to see my powder coat guy and I think the best INST MPG I got was 24(ish). If I kept the RPMs below 3k, I noticed the MPG hovered around 32-34.

I'll do a bit more testing when I remember to glance down at it.

 

im gms1 and after i just put my hahn intake on my mpg dropped 1mpg so idk maybe its just me liking to hear the turbo more hahaha

 

I decided to push my balt a little bit today before running my daily errands with my wife and son and I noticed that it felt like one of the plugs is misfiring or not firing at all. Hesitating at High RPMs and it would kick in and out. I bought the "E3" plugs from Advanced Auto parts outside of Campbell and I went back to talk to him about it. Ill be taking the E3 plugs out and putting something else in (They were $5.99 each). They are gapped at .040.

Here's a video of my instrument cluster while I was headed home on the highway. I was doing the speed limit because I try not to speed while my wife and son are in the car because it makes my wife motion sick. And its general a pretty asshat type of thing to do.

Anyone have a better plug in mind for the 2.4L that won't give me issues or any pointers to making sure the new ones are the best performance. What's the best gap for a compromise between fuel economy and performance for the 2.4L (NON ASPIRATED?)

Here's the video uneditted:

YouTube - 2008 Chevy Cobalt Fuel Economy

 

^^^Bump. I'm getting ready to change my plugs too.

 

For the 2.4 I did 2 different gap settings. Factory (.040) and Tighter (.035) I found that the "sweet spot" for the 2.4 is around .038.

I plan on regapping mine tomorrow. With my .035 setting I have awesome High RPM (4300+) horsepower but slow on the other side of 4300 (1200 - 3800)

Ill let you know how it changes the feel of acceleration / top end.

**EDIT**

I bough the NGK BKR6E's (Iridium) and they were 1.99 each and are better IMHO

 

so what are good plugs for the SS/TC??

 

Depends on your Temperature Range. There's a sticky with all the information I used to get mine for my 2.4.

https://www.cobaltss.net/forums/prob...swered-223223/

That should help alot, I got the information I needed from other members adding information in later.

 

Here's what the Fuel Economy was after I regapped my plugs and installed the Cold Air Intake. I'd say my MPG went up from 32ish to 38-40ish.

YouTube - 2008 Chevy Cobalt (LE5 [SS/NA]) 2.4L Fuel Economy

 

oem