{"model":"mk3","model_name":"MK3 Supra","vehicle":"Toyota Supra A70 (1986.5–1992, 7M-GE / 7M-GTE)","document":"Repair Manual","section":"EM","section_name":"Engine Mechanical","page":6,"pages_in_section":98,"title":"Troubleshooting (Cont'd)","section_header":"Engine Mechanical — Troubleshooting","ocr_text":"TROUBLESHOOTING (Cont'd)\n\nProblem | Possible cause | Remedy | Page\n\nExcessive oil consumption | Oil leak | Repair as necessary | LU-7\n | PCV line clogged | Check PCV system | EC-5\n | Piston rings worn or damaged | Check rings | EM-63\n | Valve stem and guide worn | Check valves | EM-32\n | Valve stem seal worn | Check seals | EM-32\n\nPoor fuel economy | Fuel leak | Repair as necessary |\n | Air cleaner clogged | Check air cleaner | MA-5\n | Incorrect ignition timing | Reset timing | IG-20\n | EFI system problems | Repair as necessary |\n | • Injector faulty |\n | • Deceleration fuel cut system faulty |\n | Idle speed too high | Check ISC system | FI-106\n | Spark plugs faulty | Inspect plugs | IG-7\n | EGR system always on | Check EGR system | EC-12, 16\n | Low compression | Check compression | EM-20, 21\n | Tires improperly inflated | Inflate tires to proper pressure |\n | Clutch slips | Troubleshoot clutch |\n | Brakes drag | Troubleshoot brakes |\n\nUnpleasant odor | Incorrect idle speed | Check ISC system | FI-106\n | Incorrect ignition timing | Reset timing | IG-20\n | Vacuum leak | Repair as necessary |\n | • PCV hoses |\n | • EGR valve |\n | • Intake manifold |\n | • Air intake chamber |\n | • Throttle body |\n | EFI system problems | Repair as necessary 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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}