Idle Mixture - Subaru 2002 IMPREZA Service Manual

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13.Idle Mixture

A: INSPECTION AND ADJUSTMENT

1. IDLE MIXTURE

Before measuring the idle mixture, make sure that

the ignition timing and the engine idle speed are

within specifications.

1) Set the gear position at "Neutral" for MT, or "N"

or "P" for AT.

2) Warm up the engine sufficiently until cooling fan

starts to operate.

3) Measure the idle mixture using CO meter.

Engine idle speed

4) If out of specification, adjust the idle mixture us-

ing CO adjusting screw of mass air flow sensor.

5) After adjusting the CO value, check and adjust

the increment coefficient of CO resistor by using

Select Monitor.

(1) Select "Current data display & Save" on the

select monitor.

(2) If out of specified data, adjust the increment

coefficient of CO resistor while rotating the CO

adjusting screw.

Specified data:

0.28 — 4.22 V

If driving the vehicle on out of specified data, the

"trouble code 49" is indicated in many case.

IDLE MIXTURE

PERIODIC MAINTENANCE SERVICES

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2001 impreza