My wife has a 2009 2.2L Flexfuel that we installed a Magnaflow Cat back system on as well as a Airraid air intake.

It sounds a lot better, but now seems sluggish in shifting and throttle response. Do i need to undo the battery and reset the computer?

I ran a few tanks a E85, but have gone back to regular unleaded for the last half dozen tanks. The gas mileage seems real low since running the E85.

 

Give this thread a read.....

https://www.chevyhhr.net/forums/2-0l-performance-tech-46/ecm-fuse-reset-25601/

 

I have the same setup plus new exhaust manifold and downpipe along with the magna cat back and airaid...you lose low end torque (hence the sluggishness) ..get it tuned and it will awaken the engine, thats what im about to do

 

Doing a tune was my next step. I was looking at the Trifecta or the Jet options. With the Jet I would probably do the mass air flow at the same time. Just need to figure out if I want stage 1 or stage 2. Some friends had tuning done in a local dyno shop, but none were HHR's.

 

I have a buddy that works in a garage and he works on more vehicles that have tried to run E85. I guess there is a lot of moisture buildup on sensors with the E85 fuel, he told me to not even try it cause i would have my HHR in thw shop within a week. And oh by the way I have only had it week tommorow. Its a 2009 Chevy HHR LS 80,000 miles/

 

dont use Jet....use either HPT or Trifecta