W/ Direct Ignition Adapter

***UPDATED BY TSB #92014, DATED FEBRUARY 1992
On some 1990 300ZX models the customer may complain of excessive spark knock (ping). This may be caused by the ignition timing being excessively advanced. It may be impossible to adjust the ignition timing to the proper specifications due to a damaged crank angle sensor and/or cam shaft. It may be necessary to replace the crank angle sensor, left cylinder head and cam shaft. Refer to the TSB for complete information.

#1 Ignition Coil Terminal:

1. Disconnect the #1 ignition coil terminal.

Direct Ignition Adapter Connection:

2. Connect adapter harness (Kent-Moore #J-38386 or equivalent) between ignition coil and engine harness.
3. Connect trigger unit (Kent-Moore #J-36777-1 or equivalent) to adapter harness.

Timing Light Connections:

4. Connect timing light to trigger loop, noting proper direction if relative to timing light operation.

Timing Marks:

5. Operate the engine at 2000 rpm for 2 minutes under no load the idle and check the ignition timing.
Timing should be 15° ± 2° BTDC.
If not proceed to step 6.
6. Adjust the ignition timing by turning the crank angle sensor located at the front of the left cylinder head after loosening the securing bolt.
7. Turn the engine off, remove the special service tools and reconnect the ignition coil terminal.