Carburetor CEC Tests W/Codes: Testing: Dr28

At this point, test procedures have determined that all engine control systems are operating correctly and are not the cause of the driveability problem. Check the following as possible causes:

• Check for at least 13 in. Hg engine vacuum in Neutral.
• Check engine valve timing.
• Check engine compression.
• Check engine cooling system.
• Check exhaust system for restrictions.
• Check engine PCV system for free flow.
• Check fuel pump pressure, volume and vacuum.
• Check torque converter stall speed.
• Check power brake booster for internal vacuum leaks.
• Check for fuel contamination.
• Check carburetor for circuit contamination and proper calibration.
• Check Technical Service Bulletins that may apply to vehicle.