| 1028Bjs# |
Jun 16, 2025 09:34 PM |
Tachometer & check engine light issue
I have a 89 RX-7 convertible with the 1.3L. Just recently the tachometer started to function sporadically. When the tachometer stops working, the check engine light comes on, but when the tachometer is working, the check engine light is off. The engine still runs regardless. I purchased and installed a used trailing coil pack (2 coils with igniter) and the problem is the same. I hooked up an inline spark plug tester on one of the trailing spark plug wires and when the tachometer stops working and the check engine light comes on, the trailing plugs don't fire. The individual trailing coils bench test ok. Any help and ideas are appreciated.
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