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Old 05-13-2014, 09:52 AM   #11 (permalink)
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Rooster, I had a similar set of problems last year from Fall till December. I remember that I had just changed my air filter (second change Stock->Wix-> now K&N). I also removed the intake silencer tube from the wheel well, just because I like intake noise, but now realize I have a free WAI! While I had it open I decided to clean my TB and MAF for first time with appropriate products. After putting it all back together and driving my normal commute, I noticed hesitation and misfire like you described especially at low speeds.
Had the codes read at parts store and bought the Haynes manual, turned out it was MAF sensor wire AND Camshaft Position Sensor (intake side I think).
I think the CPS is a job I can do myself with the repair book, but I had the dealership take care of it as I was also having a transmission trouble and still under 5yr warranty.
CobaltSS forums suggest that the life of these CPSensors is kinda short, the part is about 50-80$ and right on top of the head, real easy to get to if so inclined.

Hope it helps.

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Old 05-13-2014, 10:20 AM   #12 (permalink)
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Thanks, was browsing Cobaltss and saw that about the cam sensors and actuators as well, doesn't look to tough to change. I did about 1200 miles over the weekend and noticed the stumble only a handful of times. Nothing like it was before cleaning it. If it starts doing it consistently again I'll swap MAFs with the impala or other cobalt.
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Old 05-13-2014, 10:57 AM   #13 (permalink)
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I think when I cleaned the MAF, that I broke or screwed up the wiring to it causing my problem. Why does GM use the tiniest and flimsiest wires for their sensors, right on top of a hot engine? (rhetorical, I know it's because I only paid 12k for it new).

On another subject, I am about to replace the last two of my original tires @68k miles. How far did your OE's take you? The stock Continentals were g*d awful noisy and didn't grip AT ALL, but I do think I've gotten my investment out of them.
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Old 05-13-2014, 11:45 AM   #14 (permalink)
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Took 2 off at 40,000 going into winter they were almost to wear bars, I haven't worn out the other 2 yet, took them off going into the last winter so were probably about at 65,000 miles and still OK for summer. I'm planning on finishing them off this summer when the Nokian's wrg2's on the rear wear out but they seem to be lasting way longer than are supposed too.

I have Ecopia's on front now, I'm going to put some Nokian WRg2 or 3's on KT's cobalt this fall and use up her tires on mine during the summers. Run them all at 50+ psi.
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Old 06-02-2014, 02:15 PM   #15 (permalink)
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P0101 code today pointing to MAF, got a P0020 I think it was last week point to VVT cam sensor or actuator. It has the Impala MAF in it for about a week now, so don't think that's it. KT's cobalt was home so I should have swapped some parts with it but had other stuff to do. Each part is about $60 so don't want to just start buying without a clue of which one is really wrong.
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Old 06-02-2014, 08:38 PM   #16 (permalink)
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i cant pull up a p0020 for a cobalt, if it was a p0011(intake) or p0014(exh) i would try sticking a solenoid in

on the maf, assuming you have a stock intake, its hard to see if the intake tube is actually all the way on the throttle body, so its worth checking. other than air leaks, simillar to what okxxfe was saying, i'd be suspect of a broken wire inside the insulation near the maf connector
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Old 06-02-2014, 11:06 PM   #17 (permalink)
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Am thinking broken wire as well p0101 and p0102 both on way home, haven't checked yet but think both are maf. Car's all stock
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Old 06-03-2014, 06:57 AM   #18 (permalink)
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My Chilton's manual doesn't show a P0020, though the P0016/17 are
CKP-to-Intake/exhaust correlation so maybe it's not a part code but a "invalid value" code or calculation?
My codes when I had the problem were p0010 (Intake cam CMP, actuator circuit),
p0011 (Intake cam CMP, performance), and p0102 (MAF).
Good Luck!
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Old 06-03-2014, 09:51 AM   #19 (permalink)
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Impala FFV - '10 Chevy Impala LT
90 day: 29.54 mpg (US)

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Penny's Rogue - '15 Nissan Rogue SL AWD
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Cam's Rogue - '11 Nissan Rogue SV AWD
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Team Hyundai
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I'm thinking swapping cam sensors and MAF with Kt's cobalt, only take a few minutes. I haven't looked for the MAP yet. Car's at college, but USPSA match is close to there this weekend, go shooting, swap some parts and test drive home.
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Old 06-03-2014, 10:41 AM   #20 (permalink)
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Slow Silver - '09 Chevy Cobalt XFE Coupe
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Hephaestus - '09 Kawasaki Vulcan 900 Custom
90 day: 47.13 mpg (US)
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I don't know that the 2.2L Cobalts have a MAP sensor? I thought it was just the flow and temp. I haven't seen it referred to in my manual.

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