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ksa8907 · 08-19-2015, 01:43 PM

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.

08-19-2015, 01:43 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 02:43 PM..