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 MANUALSTOYOTA1985TERCEL DX, 4D WAGON, FWD, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMHIGH ALTITUDE COMPENSATION SYSTEMSYSTEM TESTINGHIGH & LOW ALTITUDE
1985 Toyota Tercel DX, 4D Wagon, FWD, Automatic
High & Low Altitude
1985 Toyota Tercel DX, 4D Wagon, FWD, AutomaticSECTION High & Low Altitude
- Ensure engine is at normal operating temperature. Check ignition timing at idle. Disconnect hose from distributor sub-diaphragm, and plug hose end. Recheck ignition timing. Timing should be 5° BTDC. Reconnect hose to sub-diaphragm. Verify that timing advances to about 13° BTDC.
- Disconnect vacuum hose from check valve at Black side and plug hose end. Check that ignition timing remains stationary for more than 1 minute. If timing changes, replace check valve. Stop engine and reconnect hoses to proper location.
- Disconnect 2 hoses 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.