Hey eric. I have a 2006 Hummer H3. It’s a giant problem …. I’ve already changed out the motor and had the transmission rebuild 2 weeks ago. it’s an inline 5 engine and has a catalytic converter connected to the exhaust manifold and one converter towards the rear of the Hummer. The one to the rear the Hummer sounds like a bunch of rocks in a tin can when idling. When I went to the muffler shop to get it changed out, we noticed that the converter was glowing red all the way to the O2 sensor. He told me he did not want to change the converter because there was another underlining issue regarding a fuel mixture running lean or rich which would cause the exhaust system to heat up and glow. So I need to figure that out before I change out my converter. I was wondering if you had any ideas on what it could be? The only check engine lights I get is for catalytic efficiency below threshold. Nothing else. Any help on troubleshooting this would be much appreciated. Thank you for your time.
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