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Mod | | | Forums66 Topics128,089 Posts1,056,141 Members48,436 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2007 Posts: 230 Shop Shark | | Shop Shark Joined: Feb 2007 Posts: 230 | Does an O2 sensor measure actual oxygen in the exhaust mixture, or does it measure heat, assuming that the more oxygen means more heat. Reason for asking: on initial start-up, the engine blew a lot of raw oil out of the exhausts which seeped in apparently from an open valve cover. Every thing works ok now after warm up. Did the O2 sensor get clogged or damaged ? | | | | | Joined: Oct 2005 Posts: 4,252 "Hey! I sound like Darth Vader!! | | "Hey! I sound like Darth Vader!! Joined: Oct 2005 Posts: 4,252 | Short answer, it measures the oxygen. The oil will eventually burn off. The sensor should be fine. On the other hand if you have a cat, that might cause some concerns. | | | | | Joined: Aug 2007 Posts: 1,859 Grumpy old guy playing with trucks, cars, and boats | | Grumpy old guy playing with trucks, cars, and boats Joined: Aug 2007 Posts: 1,859 | I had purchased an engine/trans/wiring harness/rad/exhaust/etc that was involved in a roll-over. O2 sensors were fine, however the Cat did melt down because of the oil soaking. Your O2's should be fine, however if your engine starts to loose significant power, your cat may have ate itself
The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me
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