catalytic converter vs fuel economy and idle.
Hi does the catalytic converter affect fuel economy and idle?With another engine in my car again it idled well today,bt the exhaust sounded heaps quieter.Towards the end of the day the exhaust was louder and it idled a bit rougher.??Are these related?
Last edited by useless; 11-17-2004 at 05:16.
Reason: Spelling..was crap