ENGINE MECHANICAL —Troubleshooting EM-7 POOR GASOLINE MILEAGE UNPLEASANT ODOR Problem Possible cause Remedy Page Poor gasoline mileage Fuel leak Air cleaner clogged Incorrect ignition timing EFI system problems • Injector faulty • Deceleration fuel cut system faulty Idle speed too high Spark plug faulty EGR system always on Low compression Tires improperly inflated Brakes drag Repair as necessary Check air cleaner Reset timing Repair as necessary Check ISC system Inspect plugs Check EGR system Check compression Inflate tires to proper pressure Troubleshoot brakes EM-8 EM-11 FI-40,67 IG-6 EM-16 Problem Possible cause Remedy Page Unpleasant odor Incorrect idle speed Incorrect ignition timing Vacuum leaks • PCV line • EGR line • Intake manifold • Air intake chamber • Throttle body • ISC valve • Brake booster line EFI system problems Check ISC system Reset timing Repair as necessary Repair as necessary FI-40,67 EM-11