View Single Post
Old 08-19-2015, 12:43 PM   #13 (permalink)
ksa8907
Master EcoModder
 
Join Date: May 2012
Location: Tampa, FL
Posts: 1,745

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
Thanks: 206
Thanked 420 Times in 302 Posts
More oxygen means incomplete burn, more co means incomplete burn, more hydrocarbons means fuel in the exhaust. Running rich has destroyed your cat. I think you know the general problem, just need to diagnose why its running rich. The oxy sensor should be correcting it... unless it is sending bad data. Edit: i see you replaced that.

Any news on compression test? Are you burning oil? Is the timing in spec? Ignition coil? Idk...

Map sensor? Those are pretty typical for failing.
__________________





Last edited by ksa8907; 08-19-2015 at 01:43 PM..
  Reply With Quote