Crank but no spark

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Have you checked for an RPM signal when cranking? I'm suspecting an issue with the crankshaft position sensor. Here are the directions for testing that circuit. I note you are a mechanic, so hopefully this will help.

The attached pics correlate with the directions.

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1998 Hyundai Elantra GLS Sedan L4-1.8L
Component Tests and General Diagnostics
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Crankshaft Position Sensor Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS

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CIRCUIT DIAGRAM

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HARNESS INSPECTION PROCEDURE

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SENSOR INSPECTION
1. Disconnect the crankshaft position sensor connector
2. Measure the resistance between terminal 2 and 3.

Standard value: 0.486-0.594 K Ohms @ 20°C (68°F)

3. If the resistance deviates far from the standard value, replace the sensor.

Clearance between the crankshaft position sensor and crankshaft position sensor wheel: 0.5-1.5 mm (0.020-0.059 in.)

Crankshaft position sensor torque: 9-11 Nm (6.6-8.1 ft. Lbs.)

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TROUBLESHOOTING PROCEDURES

HINTS:
1. If unexpected misses are felt during driving or the engine stalls suddenly, shake the crankshaft position sensor harness. If this causes the engine to stall, check for poor contact at the sensor connector.
2. If the tachometer reads 0 rpm when the engine is cranked, check for faulty crankshaft position sensor or ignition system problems.
3. If the tachometer reads 0 rpm when the engine is cranked and it does not start, ignition coil, power TR, or an ECM defect can be considered.
4. Engine can be stalled when the crankshaft position sensor cable is close to the high voltage cable due to the electronic noise caused by the high voltage induced.

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Here are the test procedures for the coil.

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1998 Hyundai Elantra GLS Sedan L4-1.8L
Resistance Testing
Vehicle Powertrain Management Ignition System Ignition Coil Testing and Inspection Component Tests and General Diagnostics Resistance Testing
RESISTANCE TESTING
MEASUREMENT OF THE PRIMARY COIL RESISTANCE

View: Test Connections

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1. Measure the resistance between connector terminals 3 and 2 (the coils at the No.1 and No.4 cylinder sides) of the ignition coil, and between terminals 3 and 1 (the coils at the No.2 and No.3 cylinder sides).

Standard value : 0.45 - 0.55 Ohms

MEASUREMENT OF THE SECONDARY COIL RESISTANCE

View: Test Connections

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1. Measure the resistance between the high-voltage terminal for the No.1 and No.4 cylinders, and between the high-voltage terminals for the No.2 and No.3 cylinders.

Standard value : 10.3 - 13.9 K Ohms

CAUTION: Be sure, when measuring the resistance of the secondary coil, to disconnect the connector of the ignition coil.

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1998 Hyundai Elantra GLS Sedan L4-1.8L
Circuit Testing
Vehicle Powertrain Management Ignition System Ignition Coil Testing and Inspection Component Tests and General Diagnostics Circuit Testing
CIRCUIT TESTING
17 Ignition Coil

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IGNITION COIL
When the ignition power transistor is turned ON by the signal' from the ECM. It sends the signal to the ignition coil, then primary current is shut off and a high voltage is induced in the secondary coil.

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CIRCUIT DIAGRAM

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HARNESS INSPECTION PROCEDURES