Engine Controls - Adjustments Hyundai Elantra I

ENGINE MECHANICAL

Before performing any on-vehicle adjustments to fuel or ignitions systems, ensure engine mechanical condition is okay.

VALVE CLEARANCE

Note. Elantra and Sonata are equipped with hydraulic lash adjusters, no adjustments are required.

CHECKING HYDRAULIC LASH ADJUSTERS

1. Remove valve cover. Press area where rocker arm contacts lash adjuster at very top. If adjuster is normal, it will feel very hard.
2. If hydraulic lash adjuster moves easily downward, it is faulty and must be replaced.
3. If hydraulic lash adjuster feels soft or spongy, air has probably entered hydraulic lash adjuster. If this occurs, check engine oil level. If engine oil level is okay, check oil screen and oil screen gasket for damage.
4. After repairing cause of air leak, warm engine to operating temperature. If there is abnormal noise at idle, bleed hydraulic adjusters.
5. To bleed hydraulic adjusters, slowly increase engine speed to 3000 RPM and back to idle over approximately 60 seconds. Repeat this several times. This will help remove air from hydraulic lash adjusters. If there is still abnormal noise, replace noisy hydraulic lash adjusters.

IGNITION TIMING

1. Ensure vehicle is at normal operating temperature, all accessories are off and transmission is in Park or Neutral. Ensure front wheels are in straight-ahead position and curb idle speed is set to specification. See IDLE SPEED & MIXTURE. NOTE: DO NOT connect Hyundai's Multi-Use Tester (MUT) while adjusting timing on 3.0L engine, or incorrect basic ignition timing reading will result.
2. Ground ignition timing adjustment connector. (Scheme 1)& (Scheme 2). Check ignition basic timing. See IGNITION TIMING SPECIFICATIONS table. Disconnect ground wire on ignition timing adjustment connector. Check ignition actual timing. See IGNITION TIMING SPECIFICATIONS table.
3. On 3.0L engine, if timing is incorrect, loosen distributor hold-down nut and turn distributor until timing is correct. On 3.0L engine, ignition timing will be advanced if distributor is turned to right and retarded if turned to left. After adjustment, tighten hold-down nut. Ensure distributor does not move when tightening hold-down nut.
4. On 1.6L and 2.0L engines, if timing is incorrect, loosen Crank Angle Sensor (CAS) hold-down nut. Ignition timing will be advanced if CAS is turned clockwise and retarded if turned counterclockwise. After adjustment, tighten hold-down nut. Ensure CAS does not move when tightening hold-down nut.

IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)

Scheme 1

Scheme 2

Idle Speed Check

1. Ensure coolant temperature is 176-203°F (80-95°C). Turn all accessories off. DO NOT check curb idle speed while cooling fan is operating. On power steering-equipped vehicles, ensure steering wheel and front wheels are in straight-ahead position.
2. Install a tachometer and timing light, or connect Hyundai's multi-use tester (except Sonata 3.0L) to diagnostic connector in fuse box. On Sonata 3.0L, ground ignition timing adjustment connector. (Scheme 1)& (Scheme 2). Operate engine at curb idle speed for 2 minutes. On Sonata 3.0L, idle speed should be 600-800 RPM. On Elantra and Sonata 2.0L, idle speed should be 650-850 RPM.
3. Disconnect ground wire from ignition timing adjuster connector (if connected in preceding step. Operate engine for at least 5 seconds at 2000-3000 RPM, then run engine at idle for 2 minutes. Check idling RPM. If Hyundai's multi-use tester is used, press Code No. 22 and read idling RPM. If idle is not within specification, ensure timing is set to specification, and adjust Idle Speed Control (ISC) and Throttle Position Sensor (TPS). See IGNITION TIMING, IDLE SPEED CONTROL and THROTTLE POSITION SENSOR (TPS). Also see IDLE SWITCH for Sonata 3.0L.

IDLE SPEED CONTROL

Note. Information for accelerator cable adjustment is not available from manufacturer.

Elantra 1.6L & Sonata 2.0L

1. Engine coolant temperature should be 176-203°F (80-95°C). Turn all accessories off. DO NOT check curb idle speed while cooling fan is operating. Place transmission in Neutral or Park. On power steering-equipped vehicles, ensure steering wheel and front wheels are in straight-ahead position.
2. Loosen accelerator cable. Connect a tachometer and ground self diagnostic terminal. (Scheme 5) Ground ignition timing adjustment connector. (Scheme 1)& (Scheme 2). Start engine and check ignition timing. Adjust if necessary. See IGNITION TIMING.
3. Run engine at 2000-3000 RPM for at least 5 seconds. Allow engine to run at idle speed for 2 minutes. Engine speed should be 650-850 RPM. If engine speed is not within specification, adjust speed using Speed Adjusting Screw (SAS). (Scheme 3) Check Throttle Position Sensor (TPS) adjustment. See THROTTLE POSITION SENSOR (TPS).
4. Turn ignition off. Remove ground from self-diagnostic check terminal. Disconnect tachometer. Disconnect battery for 15 seconds to erase diagnostic memory. Reconnect battery. Start engine and run at idle for at least 5 minutes. Check engine idle speed.

Scheme 3

Sonata 3.0L

1. Engine coolant temperature should be 176-203°F (80-95°C). Turn all accessories off. DO NOT check curb idle speed while cooling fan is operating. Place transmission in Neutral or Park. On vehicles with power steering, ensure steering wheel and front wheels are in straight-ahead position.
2. Loosen accelerator cable. Connect a tachometer. Ground ignition timing adjustment connector. (Scheme 1)& (Scheme 2). Start engine and check ignition timing. Adjust if necessary. See IGNITION TIMING.
3. Turn ignition switch to OFF position. Ground self-diagnostic check terminal. (Scheme 5) Operate engine at 2000-3000 RPM for at least 5 seconds. Allow engine to run at idle speed for 2 minutes. Engine speed should be 650-750 RPM. If engine speed is not within specification, adjust speed using speed adjusting screw, located on side of throttle body. (Scheme 4)
4. If idle speed is greater than specification, even with speed adjusting screw fully closed, ensure fixed speed adjusting screw (idle switch) has not been moved from factory adjustment mark; adjust if necessary. See IDLE SWITCH. Check Throttle Position Sensor (TPS) adjustment. See THROTTLE POSITION SENSOR (TPS).
5. Turn ignition off. Remove ground from self-diagnostic check terminal. Disconnect tachometer. Disconnect battery for 15 seconds to erase diagnostic memory. Reconnect battery. Operate engine at idle for at least 5 minutes.

Scheme 4

Scheme 5

IDLE SWITCH

Note. Idle switch is adjusted at factory; adjustment is not required unless idle switch has been replaced or fixed adjusting screw has been moved from factory adjustment mark.

1. Loosen accelerator cable tension. Disconnect idle switch connector. (Scheme 6) Loosen idle switch lock nut. Turn idle switch counterclockwise until throttle plate closes. Connect an ohmmeter between idle switch terminal and body ground.
2. Screw idle switch in until ohmmeter reads continuity. Screw idle switch in an additional 1 1/4 turns. Tighten lock nut, and connect switch connector. Tighten accelerator cable, and adjust curb idle and throttle position sensor.

Scheme 6

IDLE MIXTURE

Note. Mixture adjustment is computer controlled and is not adjustable.

THROTTLE POSITION SENSOR (TPS)

1. Loosen throttle cable. With ignition off and TPS connector connected, connect a digital voltmeter between both terminals of TPS connector. DO NOT disconnect TPS connector; backprobe through rear of connector.
2. Turn ignition switch to ON position, but DO NOT start engine. Check TPS voltage. If reading is not .48-.52 volt, turn TPS clockwise (increase) or counterclockwise (decrease) until correct voltage is obtained.
3. After adjustment, on all models except Sonata 3.0L, tighten TPS screw to 13.28-22.13 INCH lbs. (1.5-2.5 N.m). On Sonata 3.0L, tighten TPS screw to 22.13-38.94 INCH lbs. (2.5-4.4 N.m).
4. Turn ignition off, and disconnect digital voltmeter. Tighten throttle cable. Disconnect vehicle battery for at least 15 seconds to erase diagnostic memory. Reconnect battery. Start engine and check idle speed.