Pickup 2WD L4-2559cc 2.6L SOHC (4ZE1) (1993)
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Idle Speed: Adjustments
Idle Speed, Adjust
Pre-Adjustment Requirements
PURPOSE
To ensure correct results of procedures.
OPERATIONS
Prior to checking or adjusting engine operation the following procedures must be performed.
Inspect Fuel System
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Fuel clamps are tight and fuel is not leaking.
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Check fuel pipes and hoses for corrosion, damage, cracks, etc.
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Fuel filter is not clogged, fuel lines not restricted or hoses colapsed.
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Water is not present in fuel, filter or lines.
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Unleaded fuel is used in fuel system.
Inspect Air Intake System
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No leaks in the intake ducting.
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No vacuum leaks at intake manifold gasket.
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Exhaust Gas Recirculation (EGR) valve gasket is not leaking.
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All vacuum lines are connected properly, not leaking.
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Positive Crankcase Ventilation (PCV) hoses are connected and not leaking.
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Oil filler cap is installed and not leaking.
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Oil dipstick is installed and not leaking.
Inspect Electrical System
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All electrical connections are secure.
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All connections are correct.
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Engine Control Module (ECM) harnesses are routed properly and are at least 100 mm (4 in) from ignition cables.
California
NOTE: Restrictions in the idle air port cause idle speed fluctuations. Check and clean as needed.
Before attempting to check and/or adjust idle speed, ensure that the following conditions are met:
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Engine at operating temperature.
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Throttle valve switch completely closed with idle contact on.
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If equipped with power steering, front wheels straight ahead.
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A/C "OFF" is so equipped.
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Transmission in neutral.
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Automatic transmission in either "N" or "P."
Canister Control Solenoid Connector
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Pressure control VSV electrical harness disconnected.
