In the mornings it takes 3 or 4 starts to keep her running. It seems there is no choke. Of course it's injected but there should be something that will richen up the mixture. What should I look at first to diagnose the problem. I think it could be low fuel preasure, bad fuel pressure regulator, low spark, or aa combination of all. My non mechanical room mate thinks it has a bad coil. What does he know. Some info on this subject will be much appreciated. The RX7 is an 86 N/A base model series 4. Thanks, Magpie57

 

If the coil were bad it wouldn't fire period. Rotaries are angry motors, and dirty, not like happy lil 4 bangers. Try cleaning up the engine. Shoot some seam foam in the spark plug holes, change out the spark plugs, shoot some carb cleaner down the throttle body, run some fuel injector cleaner, run some engine cleaner in the oil then change it out.

It'll cough once you fire it with the seam foam, so rev it up and let it get warm before you take your foot off the gas.

 

Thanks ! I'll try these remedies and see what happens. I've never heard of seam foam. I guess I can pick some up at the checkered pepzone. What is that stuff supposed to do? Clean out the internals of the mo? I was thinking that there was some kinda FI sensor that would richen up the mix when theres frost out. Well thanks for your response, Magpie57

 

n/a's run rich enough, you don't need to run richer. But you can replace your o2 sensor in the manifold. Seafoam is a cleaner meant to decarbonize and engine among other stuff. Through the spark plugs is not the best place, do a search on it and you will get some answers about it. It could be bad spark plugs, mine once had some weird growth on it that caused it to not fire.

Yes you can pick up seafoam at any auto box store.

 

I have already pulled the top injecters after doing FI cleaner. I could never find the secondaries. I understand they are down under the intake manifold. But the uppers looked fairly clean. I was thinking that without enough fuel preasure the atomization might not be what it should. Heat helps that so once it warms up it runs better. I'm going to do a search and also test the fuel pressure and test both coils. I will also check the O2 sensor. Thanks guys! This is all great food for thought, Magpie57