Misfire at 3500 RPM! - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
 
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post #1 of 2 (permalink) Old 04-20-2017, 09:44 AM Thread Starter
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Thumbs down Misfire at 3500 RPM!

My name is Terry. I work at Rocket Chevrolet in Shelby, OH. We took in on trade a 2005 Chevy Cobalt SS Supercharged. It has a smaller pulley installed and we assume larger injectors installed and assume the ECM was reprogrammed.
When I got the car it was breaking up at idle. When you got on it, it did better but still broke up. It had a ton of codes in it. The vehicle has an Injen Air Intake and the O2 sensors were going crazy up and down. I replaced the MAF sensor (which was relocated down on the driver's side front fender area). I reprogrammed the MAF and it idles and runs great until you get to 3500 RPM then breaks up. Is there a way to program the ECM. Help!
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post #2 of 2 (permalink) Old 04-27-2017, 07:40 AM
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Quote:
Originally Posted by rocketchevrolet View Post
My name is Terry. I work at Rocket Chevrolet in Shelby, OH. We took in on trade a 2005 Chevy Cobalt SS Supercharged. It has a smaller pulley installed and we assume larger injectors installed and assume the ECM was reprogrammed.
When I got the car it was breaking up at idle. When you got on it, it did better but still broke up. It had a ton of codes in it. The vehicle has an Injen Air Intake and the O2 sensors were going crazy up and down. I replaced the MAF sensor (which was relocated down on the driver's side front fender area). I reprogrammed the MAF and it idles and runs great until you get to 3500 RPM then breaks up. Is there a way to program the ECM. Help!

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