LEMON Manuals: Even more car manuals for everyone
Home >> Isuzu >> 1996 >> Oasis LS >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Idle Speed & Mixture >> Idle Speed

Idle Speed

NOTE: Before adjusting idle speed, check the following: MIL is not on, ignition timing is correct, spark plugs are in good condition, air filter element is clean and the PCV system is functioning properly. On vehicles with daytime running lights, pull parking brake lever up, start engine and check that headlights are off.
  1. Start and run engine under no-load condition at about 3000 RPM until cooling fan comes on. Let engine slow to idle. Turn engine off. Attach tachometer to tachometer test connector (White, 2-pin with cover) located in right rear of engine compartment. Disconnect 2-pin Idle Air Control (IAC) valve connector.
  2. Start engine with accelerator pedal slightly depressed. Run engine at about 1000 RPM until engine speed stabilizes. Slowly release pedal until engine idles. Check idle speed under no-load conditions. Ensure all accessories, cooling fan and lights are off. If needed, adjust idle speed by turning idle adjusting screw. See Fig 1 . See IDLE SPEED SPECIFICATIONS  table.
  3. Turn ignition off. Reconnect 2-wire IAC connector. Remove BACK UP (RADIO) fuse from underhood relay box for 10 seconds to reset PCM. Restart engine and let idle for one minute. Check idle speed (after PCM reset) with all accessories off and transmission in Neutral or Park. Idle speed should be stable and within specification. See IDLE SPEED SPECIFICATIONS  table. Turn engine off.
  4. Start engine and idle engine for one minute with various accessories on. Check idle speed. Idle speed should be stable and within specification. See IDLE SPEED SPECIFICATIONS  table. If idle is not within specification, check vacuum hose connections. Check idle adjuster screw, fast idle valve and Idle Air Control (IAC) valve for proper operation.
  5. If idle components are okay, check MAP sensor, Electronic Load Detector (ELD), fuel injector circuit, A/C signal circuit, EGR system and lock-up control solenoid (if equipped) for proper operation. For component testing procedures, see TESTS W/CODES and SYSTEM/COMPONENT TESTS articles.
IDLE SPEED SPECIFICATIONS

Application RPM
Oasis
(1) 500-600
(2) 650-750
(3) 720-820
(1) With Idle Air Control (IAC) valve disconnected, headlights and cooling fan off, and transmission in Neutral or Park.
(2) With Idle Air Control (IAC) valve connected, headlights and cooling fan off, and transmission in Neutral or Park.
(3) With headlights on low or heater fan on HI and A/C on.
Fig 1: Locating Idle Adjusting Screw (Oasis)
G90G17117Courtesy of AMERICAN HONDA MOTOR CO., INC.
scientia non olet · About LEMON Manuals