{"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":18,"pages_in_section":98,"title":"Idle AND/OR 2,500 Rpm HC/CO Concentration Check Method","section_header":"Engine Mechanical — Idle and/or 2,500 rpm HC/CO Concentration Check Method","ocr_text":"IDLE AND/OR 2,500 RPM HC/CO\nCONCENTRATION CHECK METHOD\n\nNOTE: This check is used only to determine whether or not the idle and/or 2,500 rpm HC/CO complies with regulations.\n\n1. INITIAL CONDITIONS\n(a) Engine at normal operating temperature\n(b) Air cleaner installed\n(c) All pipes and hoses of air induction system connected\n(d) All accessories switched OFF\n(e) All vacuum lines properly connected\nHINT: All vacuum hoses for EGR systems, etc. should be properly connected.\n(f) EFI system wiring connectors fully plugged\n(g) Ignition timing set correctly\n(h) Transmission in neutral\n(i) Tachometer and HC/CO meter calibrated and at hand.\n\n2. START ENGINE\n\n3. RACE ENGINE AT 2,500 RPM FOR APPROX. 2 MINUTES\n\n4. INSERT HC/CO METER TESTING PROBE INTO TAILPIPE AT LEAST 40 cm (1.3 ft)\n\n5. CHECK HC/CO CONCENTRATION AT IDLE AND/OR 2,500 RPM\nComplete the measuring within three minutes.\nNOTE: When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by regulations.\nIf the HC/CO concentration at 2,500 rpm does not comply with regulations, try the following procedure.\nRace the engine again at 2,500 rpm for approx. 1 minute, and quickly repeat steps 4 and 5 above. This may correct the 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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}