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 MANUALSTOYOTA19964RUNNER BASE, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM TESTS W/O CODES - 2.7LSYMPTOMSENGINE IDLING PROBLEMSENGINE IDLE SPEED REMAINS HIGH
1996 Toyota 4Runner Base, RWD, Automatic
Engine Idle Speed Remains High
1996 Toyota 4Runner Base, RWD, AutomaticSECTION Engine Idle Speed Remains High
- Check for defective throttle linkage or cable.
- Check dashpot or throttle opener (if equipped).
- Check idle-up vacuum switching valve (if equipped) and wiring.
- Check idle air control valve (if equipped) and wiring.
- Check Throttle Position (TP) sensor and wiring.
- Check A/C signal circuit to Engine Control Module (ECM).
- Check park/neutral position switch signal to Engine Control Module (ECM).
- Check cold start injector system (if equipped).
- Check fuel injectors.
- Check Engine Control Module (ECM) and wiring.
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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.