ENGINE MECHANICAL — Troubleshooting EM-6 ENGINE DIESELING AFTER FIRE, BACKFIRE EXCESSIVE OIL CONSUMPTION Problem Possible cause Remedy Page Engine diesels (runs after ignition switch turned off) EFI system problems Repair as necessary Problem Possible cause Remedy Page Muffler explosion (after fire) on deceleration only Deceleration fuel cut system always off Check EFI (fuel cut) system Muffler explosion (after fire) all the ti me Air cleaner clogged EFI system problem Incorrect ignition timing Check air cleaner Repair as necessary Reset timing EM-8 EM-11 Engine backfires EFI system problem Vacuum leak • PCV line e EGR line • Intake manifold • Air intake chamber • Throttle body • ISC valve • Brake booster line Pulling in air between air flow meter and throttle body Insufficient fuel flow Incorrect ignition timing Incorrect valve clearance Carbon deposits in combustion chambers Repair as necessary Check hoses and repair as necessary Repair as necessary Troubleshoot fuel system Reset timing Adjust valve clearance Inspect cylinder head FI-9 EM -11 EM-10 Problem Possible cause Remedy Page Excessive oil consumption Oil leak PCV line clogged Piston ring worn or damaged Valve stem and guide bushing worn Valve stem oil seal worn Repair as necessary Check PCV system Check rings Check valves and guide bushing Check seals EM-45