vincewarde
Member
- Joined
- November 24, 2010
- Messages
- 32
- Reaction score
- 10
- City, State
- Cameron Park
- Year, Model & Trim Level
- 1993 Explorer
I have a 1993 Explorer w/4.0 - and I am having a hard time passing smog. I have changed the Oil, Filter, Air Filter, Plugs and pulled codes - everything passed, no indications of any problem. The plug were platinum and had been in there 50k plus. That said, they looked like the motor had been running rich. The only problem is high CO. Everything else passes.
My thought is that if the problem is the Cat Convertor, we should see high HC, not just high CO. Even though there are no error codes, I'm thinking that the O2 sensors could be bad or clogged. I only remember replacing one of them several years ago. What do all of you think? Thanks!
My thought is that if the problem is the Cat Convertor, we should see high HC, not just high CO. Even though there are no error codes, I'm thinking that the O2 sensors could be bad or clogged. I only remember replacing one of them several years ago. What do all of you think? Thanks!