General Information

A thorough road test and check of minor carburetor adjustments should precede major carburetor service. Specifications for some adjustments are listed on the Vehicle Emission Control Information label found in each engine compartment.

A complete list of specifications for the carburetor is included at the end of the fuel section.

Many performance complaints are directed at the carburetor. Some of these are a result of loose, misadjusted or malfunctioning engine or electrical components. Others develop when vacuum hoses become disconnected or are improperly routed. The proper approach to analyzing carburetor complaints should include a routine check of such areas.
(1) Inspect all vacuum hoses and actuators for leaks.
(2) Tighten intake manifold bolts, carburetor mounting nuts and isolator mounting bolts to specifications.
(3) Perform cylinder compression test.
(4) Clean or replace spark plugs as necessary.
(5) Test resistance of spark plug cables. Refer to "Ignition System Secondary Circuit Inspection," Electrical Section.
(6) Inspect ignition primary wire. Test coil output voltage, primary and secondary resistance. Replace parts as necessary. Refer to "Ignition System" and make necessary adjustment.
(7) Reset ignition timing.
(8) Check carburetor idle mixture and speed adjustment.
(9) Test fuel pump.
(10) Remove air cleaner filter element and blow out dirt gently with an air hose. Install a new recommended filter element if necessary.
(11) Inspect crankcase ventilation system.