Basic Ignition Timing - Adjustment Procedure
Group: ENGINE ELECTRICALNumber: 93-36-010
Date: AUGUST, 1993
Model: DOHC EQUIPPED ELANTRA, SONATA
Subject:
TIMING LIGHT USAGE AND BASIC IGNITION TIMING ADJUSTMENT PROCEDURE
DESCRIPTION
In order to assure proper engine operation, precise ignition timing is essential. This technical service bulletin provides information concerning the correct use of a timing light on distributorless ignition systems.
Distributorless ignition systems, such as are used on the Sonata 2.0L and Elantra 1.6L and 1.8L engines, employ a single coil pack to fire two cylinders simultaneously. When checking the ignition timing on these engines, use of the advance function on an Advance Type timing light will result in twice the actual advance. For example, 51 BTDC will read 10 degree BTDC on the advance knob scale.
IGNITION TIMING ADJUSTMENT PROCEDURE FOR 1.6L, 1.8L & 2.0L DOHC ELANTRA AND SONATA ENGINES
Checking Conditions
^ Engine coolant temperature between 176OF and 205OF (800 to 95'C)
^ Lights, electric cooling fan and accessories off.
^ Transaxle in neutral ('P" or "N" range in A/T vehicles).
^ Steering wheel in the neutral position (for vehicles with power steering).
Adjustment Procedure
1. Install the tachometer to the noise filter using SST 09273-24000.
2. Install the timing light.
When checking the base ignition timing for a DOHC engine with the advance type timing light, you must set the adjusting knob to the "Zero" position.
3. Rev the engine for more than 5 seconds at an engine speed of 2,000 to 3,000 rpm and then idle the engine for two minutes.
4. Check that the idle rpm is within the specified value.
Idle speed: 750 +/- 100 rpm (FOR 1.6L DOHC ENGINE)
700 +/- 100 rpm (FOR 1.8L, 2.0L DOHC ENGINE)
If incorrect, check the idle speed control system.
These vehicles have distributorless ignition systems with two coil packs. Each coil pack fires two different cylinders (# 1/ # 4 and # 2/ # 3). If the timing light pick-up is placed on wire # 1, it is actually measuring the timing on the firing of cylinders # 1 and # 4.
CAUTION:
The Multi-use tester must be removed when adjusting base ignition timing.
NOTE:
When adjusting the base ignition timing of a DOHC engine (1.6L, 1.8L, 2.0L) equipped with a stepper motor type ISC servo in the throttle body, the MUT should not be connected to the vehicle, because the ECM controls the engine even though the ignition timing adjustment terminal is grounded. For example, if you adjust the basic ignition timing of a DOHC engine to 5 degree +/- 2 degree BTDC with the MUT installed, the actual ignition timing will be about 4 degree ATDC.
5. Ground the ignition timing adjustment terminal using a jumper wire.
6. Run the engine and let idle.
7. Check the base ignition timing.
Basic ignition timing: 5 degrees +/- 2 degrees BTDC (at idle)
8. If the timing is incorrect, loosen the mounting nut of the crank angle sensor, and rotate the crank angle sensor until the timing is correct.
NOTE:
The ignition timing will be retarded if the crank angle sensor is turned to the left, and advanced if turned to the right.
9. After adjusting, tighten the mounting nut.
Tightening torque: 7-9 lb.ft. (100-130 kg.cm, 10-13 N-m)
NOTE:
Be careful that the crank angle sensor does not move when tightening the nut.
10. Stop the engine and disconnect the jumper wire connected at step 5.
11. Run the engine at curb idle speed again.
12. Check if the actual ignition timing is correct.
Actual ignition timing: 8 degrees BTDC
NOTE:
Actual ignition timing may vary depending on the control mode of the engine control module. In such a case, re-check the basic ignition timing. If there is no deviation, the ignition timing is functioning normally.