Description : Can someone help me understand these vehicle smog test results (details inside)?
Last Answer : answer:You are correct on both counts. When an engine is not yet at operating temperature, it requires a richer fuel mixture to run. This is due to the greater friction of the more viscous oil - more power is needed ... 2,500 - 3,000 rpm in my car when cold, but can rev out to 7,000 rpm when warm.