I have a 1994 C4 corvette with 53K miles that continues to post a 64 (lean O2) diag code. Replaced o2 sensor (2x), checked wire continuity to ECU and voltage @ sensor. Fuel pressure seems ok @ 41 lbs and injectors read 16.0- 16.5 ohms. Engine runs fine until operating temperature attained and then runs ruff under closed loop control while at idle. A lot of black smoke when run hard under closed loop control. Also BAD gas mileage and smell indicating rich mixture. New plugs and wires. All other parts and sensors are original.
Tuesday, September 6th, 2011 AT 6:50 PM