No start no spark - 2004 Mazda RX8

I checked for recalls on your car. There are 4.
1- passenger side airbag.
2- exhaust heat insulator
3-engine cooling
4- Front control arm abd lower ball joints
I also checked for TSBs, and there are several. The one that caught my eye was on "no starts".
You may want to check with your closest dealer on these. Hope this helps.

Check battery for condition including load test most places do for free then try a security system reset. See link.
https://www.2carpros.com/articles/how-to-reset-a-security-system

Hi PABLO JIMENEZ,

If you decide to check the condition of your battery yourself here is a link to helpful information from this site that features written instructions, pictures and a video explaining how to load test your battery yourself. If you need further assistance please come back to 2CarPros.com. We are always happy to help.

https://www.2carpros.com/articles/how-to-check-a-car-battery

Thank you for visiting 2CarPros.

Kindest regards,

Renee
Admin

Hi Cobraman_114,

Thank you for the donation.

A TSB was issued for non starting, lack of power and/or presence of trouble codes, ( P2107, P2108, P2402, P0420). For such cases, the PCM has to be reflashed and this can only be done at the dealer.

ENGINE NO START, LACK OF POWER, DTCS P2107, P2108, P2402 OR P0420 - POWERTRAIN CONTROL MODULE (PCM) REFLASH
TECHNICAL SERVICE BULLETIN
Reference Number(s): 01 - 008/05
Affected Model(s): Mazda Special Program (MSP04) - 2004 RX- 8
Superceded Bulletin(s): 01 - 022/04, Date of Issue: November 01, 2004
Related Ref Number(s): 01 - 008/05, 01 -022/04
ARTICLE BEGINNING
APPLICABLE MODEL(S)/VINS
NOTE: This bulletin supersedes the previous bulletin 01 -022/04, issued on 11/01/2004. The REPAIR PROCEDURE and CALIBRATION INFORMATION has been revised.
2004 RX- 8 vehicles built prior to March 12, 2004
VIN Range: JM1FE17**40100001 - 40135536 "Â

DESCRIPTION
Some vehicles may experience the following concerns:
"Â Engine fails to start (cranks but no start) at cold engine temperature. This is caused by
flooded spark plugs due to slightly rich air/fuel ratio for cold starting.
"Â Engine is hard to start after short distance drive without engine reaching normal operating temperature at cold ambient temperature. This is caused by lower engine compression due to seals icing by moisture inside engine.
"Â Engine has lack of acceleration power and / or knocking when driving at more than approx. 6000 RPM or at high altitudes. This is caused by poor combustion gas sealing due to the lack of amount of oil supplied from the metering oil pump.
"Â MIL illuminates with DTC P2107/2108 stored in memory. This is caused by sub CPU - main CPU communication error after jumpstarting the engine due to dead battery.
"Â MIL illuminates with DTC P2402 stored in memory. This is caused by improper threshold setting for DMTL motor electric current tolerance.
"Â MIL illuminates with DTC P0420 stored in memory. This is caused by improper threshold setting for rear O2 sensor output tolerance.

Thank you for the input.

Guess I jumped the gun by going too far ahead when the basics were overlooked.

The engine for this vehicle works great but its lifespan is something Mazda is unable to provide longevity.

Thank you for using 2carpros

Cranks but no start condition-do below:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.

I am sorry I do not understand your question. Can you please rephrase it?

Sorry for the delay and I hope I understand you correctly.

Only front 2 injectors would be working at idle. 2 rear would work only after 5000 rom and the other 2 after 6250 rpm.