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Curly1 · 07-13-2009, 09:45 PM

I have a 2008 HHR Chevy with the 2.2. Original it was 21/30 MPG. I added larger tires, larger exhaust, better intake and filter and did a Trifecta tune on it. Moved the mileage up to 26/38 and it ran better to. Most of the mods were done 10,000 to 15,000 miles. Now at 30,000 miles the car is running real rich and mileage is back down to 21/30???
Did a Data log on it and it said the O2 sensor was reading lean causing ECM to richen it up. Tail pipe is black and sooty.
With the Trifecta tune I really do not want to take it back to dealer unless I have to but I want it fixed. Does anyone have any ideas on how to lean it back out?
Thanks in advance, Bruce

07-13-2009, 09:45 PM	#1 (permalink)
Curly1 EcoModding Lurker Join Date: Oct 2008 Location: United States of Texas Posts: 43 Princess - '08 Chevy HHR LSSR 90 day: 23.66 mpg (US) Thanks: 0 Thanked 2 Times in 1 Post	Need help running rich! I have a 2008 HHR Chevy with the 2.2. Original it was 21/30 MPG. I added larger tires, larger exhaust, better intake and filter and did a Trifecta tune on it. Moved the mileage up to 26/38 and it ran better to. Most of the mods were done 10,000 to 15,000 miles. Now at 30,000 miles the car is running real rich and mileage is back down to 21/30??? Did a Data log on it and it said the O2 sensor was reading lean causing ECM to richen it up. Tail pipe is black and sooty. With the Trifecta tune I really do not want to take it back to dealer unless I have to but I want it fixed. Does anyone have any ideas on how to lean it back out? Thanks in advance, Bruce