Aspire L4-81 1.3L SOHC (1994)
Idle Speed: Adjustments
^ Warm engine to operating temperature.
^ Connect tachometer.
^ Turn engine off.
^ Turn all accessories off.
^ Place transmission in park (ATX) or neutral (MTX).
^ Connect a tachometer.
^ Ground the Powertrain Control Module (PCM) Self-Test Input (STI) (ten) pin at the data link connector.
Data Link Connector
^ Start engine
^ Note idle speed.
^ Check the initial ignition timing. Adjust if not 10°±1 BTDC.
^ Start engine check idle speed. Idle speed should be 750±50 rpm (ATX) and 700±50 rpm (MTX). If not within specification, correct with idle
speed adjustment screw.
NOTE: This adjustment must be done when the cooling fan motor is not operating.
Adjustment Screw
^ Turn engine "OFF", remove STI ground, and let engine cool.
^ After the engine has cooled start engine, and note idle speed.
^ Does the engine speed up during warm-up when started cold.
YES -- Vehicle Idle speed is fine.
NO -- Go to BPA1. See: Powertrain Management/Fuel Delivery and Air Induction/Testing and Inspection/Pinpoint Tests/BPA - Bypass Air
Control System/BPA1 - Check IAC Valve Resistance
