Needing some quality advice for an issue with my 06 cobalt ss/sc. Basically the car surges during wot around 4-5k rpms horribly, it acts as if it's getting all the fuel but no air. I've cleaned the tb, new maf, new camshaft position sensor, new coolant temp sensor... nothing is fixing the issue. If I unhook the maf sensor and hook it back up while the car is running it'll run great, I figured the maf that i had bought was defective but I recently bought another one from the dealership and nothing changed. Someone pls help, this has been an on-going issue for about a year now. If you're accelerating and press the gas pedal more than 70% in any gear it'll climb to about 4k rpms and then start to bog down and won't go anywhere until around 5.5k rpms. At this point it gains all power back and reverts back to a clean A/F, but during that 4-5.5k rpm mark it just gets completely flooded with fuel. Any advice is useful at this point.

- 06 cobalt ss/sc
- Stage 1 pcm
- Headers, full zzp exhaust
- K&n cold air intake
- NGK Iridium plugs

 

Any check engine light / trouble codes? What's Stage 1 pcm?

 

The stage 1 pcm is a tuned Ecu from ZZP, the engine light has been on since I purchased the car. I had it ran on a code reader at an auto parts store and they said that I needed to clean injectors. I cleaned and pressure tested them and no issues there. It's not throwing any other codes

 

I assume if they told you to clean the injectors that the code was indicating it running lean? If you could find out specifically what that code is it would be very helpful for us to lend advice.

 

I will go get the exact codes soon, however if anything the car is running very rich. I'm burning excessive fuel, the injectors are flowing great however it feels as I'm no getting enough air to match the fuel. I purchased an AEM wideband and it should be here soon and I will update you on the a/f ratios, Thanks.