4A 4 EMISSIDN IIONTIlI LS EXHAllST SYSTEMS VI Sarvlu Diagnosis Continued Condition Possible Cause Correction FAULTY HIGH 1 Incorrect ignition timing 1 Adjust timing SPEED OPERATION 2 Defective TCS system 2 Test TCS System repai r as necessary 3 Faulty distributor centrifugal 3 Check centrifugal advance and advance repair as necessary 4 Faulty distributor vacuum 4 Check vacuum advance and repair advance as necessary 5 Low fuel pump volume 5 Replace fuel pump 6 Improper spark plug gap 6 Adjust gap 7 Faulty choke operation 7 Adjust choke 8 Partially restricted exhaust S Eliminate restriction manifold exhaust pipe muffler or tailpipe 9 Clogged vacuum passages 9 Clean passages 10 Improper size or obstructed main 10 Clean or replace as necessary jets 11 Clogged secondary metering 11 Clean passages passages 4350 V4 carburetor 12 Restricted air cleaner 12 Clean or replace as necessary 13 Secondary linkage throttle valves 13 Locate and eliminate binding or shaft binding 4350 4V condition carburetor 14 Auxiliary inlet valve not adjusted 14 Adjust inlet valve properly 4350 4V carburetor 15 Faulty distributor rotor or cap 15 Replace rotor or cap 16 Worn distributor shaft 16 Replace shaft 17 Faulty coil 17 Test coil and replace as necessary 18 Leaking engine valve s 18 Check cylinder leak down or compression and repair as necessary lg Fanny valve Sprinms 4 19 Inspect and test valve spring tension and replace as necessary 20 Incorrect valve timing 20 Check valve timing and repair as necessary 21 Intake manifold restricted 21 Pass chain through passages