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It's odd that it happened 10 minutes after the valve cover gasket replacement. Make sure nothing as far as wiring to the distributor is damaged, disconnected, pinched and so on.
Next, there is a pick-up coil and an igniter which can be the issue. My first suspect would be the pick up coil. The first pic below is a wiring schematic of the ignition system. The remaining pictures correlate with the directions related to the pick up coil test.
Because of the distributor position in correlation with the valve cover, make sure nothing was damaged as far as wiring.
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Here are the directions for testing the pick up coil:
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1989 Toyota Corolla Sedan L4-1587cc 1.6L DOHC (4A-GE)
Pick-Up Coil Test
Vehicle Powertrain Management Ignition System Pick-Up Coil Testing and Inspection Component Tests and General Diagnostics Pick-Up Coil Test
PICK-UP COIL TEST
***UPDATED BY TSB# EN91-007, JUNE 1991
Primary Coil Wire Connector
Pic 2
1. Disconnect the wiring connector near the distributor.
2. Connect one end of an ohmmeter to the G+ terminal. Connect the other end to the G- terminal.
G Pickup Coil Resistance: 130 - 210 ohms
3. Connect one end of an ohmmeter to the Ne+ terminal. Connect the other end to the NE- terminal.
NE Pickup Coil Resistance: 130 - 210 ohms
Pickup Coil Air Gap
pic 3
4. Using a non magnetic feeler gauge, measure the gap between the signal rotor and pickup coil projection.
Air Gap: 0.008 - 0.016 in (0.2 - 0.4 mm)
Note: The air gap is not adjustable. If any of the above tests reveal a pick-up coil outside specifications, replace the distributor housing assembly.
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Let me know what you find.
Joe
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Thursday, October 24th, 2019 AT 8:09 PM