Originally Posted by en0oNmAI

I built a cold ait for my 2.2L hhr and had the exact same problem you are having. Appearantly the stock setup is hiding something becase the second you put everything right the light goes off (CEL). It's almost as if modifying the intake on the hhr is a no no and chevy wants it kept that way. I have found something that helped and stopped the engine light from going on but do not take ANY responsibility for anyone else doing this! I just bought a 2nd MAF housing and used it in conjunction with the rest of my tubing setup. No light, no burble, not stall. Works great but my routing doesnt hit throught the fender in the passenger side. I found I have more room dropping in between the lower rad. hose and the coils then into the driver fender! Sounds nice and I can touch the pipe after running hard and its cool to the touch. Not bad for southen AZ weather!
Jason