87 GXL wont start

[FRED]

You don't need to disconnect the CAS. The coils are fed power by the EGI INJ fuse, so they (coils and injectors) can't fire if you pull that fuse. IF you pull the EGI COMP instead....same deal, the computer controls firing of the coils so they can't fire if that fuse is pulled. Either of the EGI fuses kills fuel and coils firing.

[Pete_89T2]

Originally Posted by FRED

You don't need to disconnect the CAS. The coils are fed power by the EGI INJ fuse, so they (coils and injectors) can't fire if you pull that fuse. IF you pull the EGI COMP instead....same deal, the computer controls firing of the coils so they can't fire if that fuse is pulled. Either of the EGI fuses kills fuel and coils firing.

Fred - Good point, pulling the EGI fuse does in fact kill both fuel & spark, so there is no need to disconnect the CAS that I can see. Oddly enough, the compression test procedure in my '89 FSM(ref. page C-7) states to disconnect the CAS, but it is completely silent with regards to pulling the EGI fuse - go figure!