03-23-2010, 09:41 AM
Join Date: Jun 2006
Location: Europe - Greece
Loss of Power at High Revs, accompanied with high pitched noise.
Well the story is the following
I am talking about the RX-8 low power manual gear box 5 (Europe Specs).
The problem is that after 5.000rpm there is a hesitation kind of loss of power. You can say that after 5000rpm the engine is having a hard time in order to continue revving and at the same time I can hear a high pitched noise not heard before.
-I started by checking the plugs and actually I changed them with no result (new plugs) .
-Then I checked the Cat that has no problem (visual inspection and also shaking it) and I replaced the cat with another one that a friend lent me just for testing. Again the same problem after having changed the cat (new cat).
-Then I changed the final muffler in the event of something was blocking the exhaust gas for escaping freely but also no luck there again (new final muffler).
-I have checked the compression witch is a little bit bellow spec but this is not the problem. I have driven a lot of RX-8 with marginal compression and they run fine.
-Next thing was to burn the fuel in the event of having bad gas but also no luck again, after having put new gas in the tank again the same problem. (new fuel)
So it remains to change the ignition coils and after that to replace the fuel pump but I am not sure that either of those things might help me.
In addition the dealer cannot find the problem , my warranty has expired anyway to change the engine and I think the only think that I have not mentioned before is that the RX-8 presented the high revs problem after I had given the fuel becks injectors for cleaning and also changed my clutch not to OEM but I have installed clutch/pressure plate/flywheel from RX-7 FC.
So If is is possible from the data given to have a verdict or at least some direction that may lead to solution, I would appreciate a lot.