CO Method (carbureted Models) Dodge Ram I

1. Remove carburetor from engine and gently clamp in a vise with the adjusting screw facing up. Be careful to protect gasket surface from vise jaws.
2. Drill a 5/64" (2 mm) pilot hole in the casting surrounding the idle mixture adjusting screw. Redrill hole to 1/8" (3 mm). (Scheme 4) Insert a blunt punch into the hole and drive out the concealment plug. Reinstall carburetor.
3. Turn lights and accessories off. Place transmission in Neutral. Run engine until normal operating temperature is reached. Turn ignition off and disconnect negative battery cable for 3 seconds. Reconnect negative battery cable and disconnect wiring harness at oxygen sensor.
4. Run engine for more than 5 seconds at 2000-3000 RPM. Run engine at idle speed for more than 2 minutes. Set engine idle speed and idle CO to specified values by adjusting the idle speed screw and the idle mixture screw.
5. Reconnect oxygen sensor. If engine idle speed is outside specified speed range, reset speed to correct value using idle speed screw. Reinstall concealment plug to seal idle mixture screw.

Removing Concealment Plug. Scheme 4

CO LEVEL SPECIFICATIONS AT IDLE