F1 EXHAUST EMISSION CONTROL SYSTEMS IMPORTHNT NOTICE The Exhaust Emission Systems covered in this publication meet State and N Federal requirements for hydrocarbon and carbon monoxide emissions To assure continued proper operation these systems must be inspected regularly parts must be replaced at factory recommended intervals and engine tune up services performed at intervals specified in the Exhaust Emission Con trol System Maintenance charts For the above reasons these systems must not under any circumstances be altered to anything other than required specifications provided in this publication Further the Exhaust Emission Control System or any of its components must not be physically altered or modified in any respect DHTH TI 1G For the serviceman s guidance each vehicle equipped with exhaust emission control will have data tag permanently affixed to the radiator shroud in example K VEHICLE EMISSION CONTROL INFORMATION J MODEL F4 I34 C I D Jeep ENGINE AT NORMAL OPERATING TEMPERATURE fa gg LIGHTS AND ALL ACCESSORIES OFF IDLE MIXTURE LEAN BEST IDLE IGNITION TIMING 0 TDC SPARK PLUG GAP 030 DVIELL 42 020 POINT GAP IDLE SPEED 700 750 RPM TRANSMISSION IN NEUTRAL DURING TUNE UP SEE SERVICE MANUAL FOR ADDITIONAL INFORMATION THIS VEHICLE CONFORMS TO U S DEPT OF H E W REGULATIONS APPLICABLE TO 7977 MODEL YEAR NEW MOTOR VEHICLES JEEP CORPORATION 144oi timing idle speed and idle mixture 148