Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1984CELICA GT, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMHIGH ALTITUDE COMPENSATION SYSTEMSYSTEM TESTINGHIGH ALTITUDE CHECK
1984 Toyota Celica GT, 2D Hatchback, Automatic
High Altitude Check
1984 Toyota Celica GT, 2D Hatchback, AutomaticSECTION High Altitude Check
- Warm up engine and check ignition timing at idle. Disconnect hose from distributor sub-diaphragm, and plug hose end.
- Check ignition timing. Timing should be 5° BTDC. Reconnect hose to sub-diaphragm. Check that timing advances about 12° BTDC.
- Disconnect vacuum hose between check valve and vacuum pipe at vacuum pipe side. Plug pipe end.
- Disconnect 3 hoses from pipes on top of HAC valve. Blow air into each hose and check that air flows into carburetor. Reconnect hoses to proper locations.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.