Hello I have a 04 rx8 and it has about 110k miles. I have recently put new spark plugs, spark plug wires and new coils in it. It will run perfect had a mechanic test drive it he even had it 115 mph without any problems. Before the new spark plugs it would bog off and die or you'd have to keep pumping the gas. Only code it has showed was a vacuum solenoid valve and I put a new one in it hoping it would fix it But didn't. I know the motor isn't blown up or it wouldn't run so good. I can start it cold and it'll start but if I let it warm up and shut it off it'll crank and start and die almost immediately . It has no other codes don't know what to do, please help!

 

Go get a compression test. Your reasoning for why "the engine isn't blown up" is severely flawed. A rotary engine can be failing miserably and still be able to start, run, and put down enough power to haul the car up to surprising speeds. This isn't a piston engine, where a blown engine is a catastrophic event.

Being able to start fine when cold but not when hot, plus stalling when hot, is a classic sign of compression loss.

 

Would there be codes if so?

 

Not necessarily

 

The entire CEL code system is emissions focused. The only CELs that might have anything to do with the health of your engine are ones that also cause emissions problems.

"CEL" means "Check Engine Light", but it would be far more accurate to call it "Check Emissions Light"

OBD3 will most probably expand the range of CELs to non-emissions areas to a rather significant degree.

 

Get a compression test done. Mine was the same way when I got and it had the following problems.

Clogged cat
Failed coil
Bad compression (Apex seals were toast)

 

you could also try a decarb on the engine and supplement premixed fuel in the hopes that the numbers come back up to a reasonable level, but that is just a hope and nothing you can really rely on. once at about 100k miles the rotor housings are usually fairly well chewed up and they are the major items inside the engine that hold compression in.

once a rotary engine is running, the dynamic sealing characteristics mask low compression issues.

 

No chance on it being a fuel pump? When we lift up some kind of switch it will start up

 

Huh? Is the switch on the garage wall? The neighbor's house? In the engine bay? In the cabin?

"Some kind of switch" is rather....vague.

 

I'll get a pic for you guys maybe I can figure something out lol