Hi,

Engine idles it would seem OK but once start to move off car engine lacks power, engine rough, feel the uneven power with hand on the manual gear shift stick also. The problem between 1000 and 2000 rpm.

When engine cold it fires up no problem because extra fuel being put into the engine but on a warm start need to turn over a few times.

Coils and Plugs relatively new. Once driving everything seems OK. Surprised no engine management light on yet!

Appreciate help on this. Thanks

 

The 125ish CEL codes that can throw a check engine light are for emissions management. They will not be able to tell you about most of the common problems that a car can have, even one as quirky and tempermental as the RX-8, because most engine dynamics are not actually monitored.


Harder time starting hot than cold is a classic sign of compression loss. Go to a dealer and get your engine compression tested.

If your techometer needle is stable at about 850rpm when you feel the roughness, then the vibration is going to be from failing motor mounts. If the needle itself won't remain stable, then there is an airflow, fuelflow, or spark related problem.

 

++ ^^.

You mentioned ignition work, but the MAF and the ESS likely need looking to. MAF makes a huge difference.

Check out the Congrats thread below, lots of easy mods to help. Do ESS, MAF and Grounds (use the star washer option first). You might be surprised how it helps.