4A 2 EMISSIDN CONTROLS EXHAUST SYSTEMS VI Survlcu Dlagnnsls Continued Condition Possible Cause Correction HARD STARTING 6 Exhaust manifold heat valve stuck 6 Repair as necessary NE F gIR t7 AL 5 NKS 7 Faulty fu l Pump 7 Replace fuel pump Continued I 8 Incorrect choke cover adjustment 8 Adjust choke cover 9 Inadequate unloader adjustment 9 Adjust unloader 10 Faulty ignition coil 10 Test and replace as necessary 11 Improper spark plug gap 11 Adjust gap 12 Incorrect initial timing 12 Adjust timing 13 Incorrect valve timing 13 Check valve timing repair as necessary ROUGH IDLE OR 1 Incorrect curb or fast idle speed 1 Adjust curb or fast idle speed STALLING 2 Incorrect initial timing 2 Adjust timing to specifications 3 Improper idle mixture adjustment 3 Adjust idle mixture 4 Damaged tip on idle mixture 4 Replace mixture screw s screw s 5 Improper fast idle cam adjustment 5 Adjust fast idle 6 Faulty EGR valve operation 6 Test EGR system and replace as 7 Faulty PCV valve air flow 7 Test PCV valve and replace as necessary 8 Exhaust manifold heat valve 8 Lubricate or replace heat valve inoperative as necessary 9 Choke binding 9 Locate and eliminate binding condition 10 Improper choke setting 10 Adjust choke 11 Faulty TAC unit 11 Repair as necessary 12 Vacuum leak 12 Check manifold vacuum and repair as necessaiy I3 Improper fuel level 13 Adjust fuel level 14 Faulty distributor rotor or cap 14 Replace rotor or cap 15 Secondary throttle valves not 15 Locate and eliminate binding closing 4350 Model 4V condition carburetor