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Home >> Chevrolet >> 1992 >> Lumina Z34, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 2.5L/151 TBI In-Line 4 VIN [R] >> Air Induction/Idle Control System Testing >> Curb Idle Check/Adjust

Curb Idle Check/Adjust

The idle is electronically controlled by Electronic Control Module (ECM) via the Idle Air Control (IAC) valve. No adjustment provisions exist.

If the throttle body is worn or the throttle opening setpoint has been tampered with, the minimum throttle opening, or "Minimum Idle Speed", can be adjusted. Do not adjust minimum idle speed for other reasons (e.g. to change the actual idle speed). This procedure was formerly known as a "Minimum Air Rate Adjustment".

CURB IDLE RPM SPECIFICATIONS (1)

Application RPM
2.5L (VIN R)
A/T (2) 800
M/T 800
(1) Specifications are for reference only, with ALDL in Open mode. No adjustment is possible, as the speed is electronically controlled via IAC motor.
(2) In DRIVE.
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