I just got an 88 rx-7 and it won’t start. I can see one spark right when I turn the key but then there are no more. I already replaced the CAS. What could this be?
thanks y’all!

 

First, get yourself a copy of the FSM with the wiring diagrams.

The Factory Service Manuals for all years of RX-7 (and many other rotary cars) can be downloaded for free here: Foxed.ca - Mazda RX-7 Manuals . They contain all common service information and more, and are an essential tool for any sort of service work that needs to be performed on these cars.

Additionally, the Haynes service manual for the 1986 thru 1991 RX-7 (both turbo and NA) can be found at most local auto parts stores or purchased from any good bookstore (ISBN number 1 56392 007 7). It is only about $25 and is a great quick reference for things like this. Not only does it contain most of the information in the FSM condensed into an easy to read format, but it includes full wiring diagrams as well.

These manuals will answer 99% of service related questions for the car and if you intend to do your own repair work, you will need at least one of them. Preferably both, since the FSM is a free download. The Haynes is a good quick reference covering 99% of questions, while the FSMs show complete and detailed procedures.

Now, check to make sure the ECU has power.
Check the leading and trailing coil connectors for 12V on the appropriate wires (tan, I believe).
Pull the CAS and spin it by hand. Spark?