Hey buddy I'm hoping you are still around... You have giving me very useful information before and now I'm seeking your help again.. Im having issues with an 90 mazda rx7 turbo... the engine harness has been spliced into, prior to me receiving it. I've replaced a few things to include injectors, spark plugs and wires, alternator, batt. water-pump and inter-cooler piping. For some reason it won't start. It rotates but won't start..

This isn't an answer to the question but does the car shake when you try to start it?

If so that's a pretty good indication of a dead motor.

This happened to my partners RX (same model and year) he had to buy a replacement engine.

The link below may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-11.html#post2123675