Hesitation and/or a lack of power can be caused by the secondary shutter valve (SSV) in the intake manifold becoming stuck open due to carbon build up around the SSV shaft. This may occur with no Check Engine light illumination but eventually the light will illuminate with code P2070 (Secondary Shutter Valve [SSV] stuck open). The cleaning procedure described under the service bulletin is a long process and it is recommended to install the updated SSV actuator and gaskets. The SSV is activated at higher RPM and the carbon accumulation can happen when it opens infrequently. The effects RX-8's built before April 18, 2007.
Car Problem Reports
Mazda RX-8 Hesitation Caused by Sticking Secondary Shutter Valve
Mazda RX-8 Problem
Average Mileage: 89,998 mi (34,288 mi - 148,000 mi)
Visitor, 2004 Mazda RX-8, 113,000 mi
Car hesitates will not pull without stepping on the gas. Performance has dropped greatly. Not fixed was told it would cost over $800.
Visitor, 2004 Mazda RX-8, 148,000 mi
Car won't accelerate and goes dead if I stop or pause.
Visitor, 2004 Mazda RX-8, 70,000 mi
ssv stuck open
Visitor, 2005 Mazda RX-8, 105,000 mi
Same problem here and if you bring it to a dealership take a mask and a gun and give it to the service reps as they hold you up for money like no other service departement so help them out witht he props this way you can see how they will STICK you UP..Mazda Maple Shade uggggggggggggggh
Visitor, 2007 Mazda RX-8, 34,288 mi
I have had my car towed to a dealer 3 times and a Repair shop once. Each time the car engine would turn over, but not start. The engine was found to be flooded and excess gasoline was cleaned out. Battery and plugs replaced 2 times. The first time it happened, the dealer replaced SVV Valve with associated componets. Bulletin 01-019/08.
Visitor, 2004 Mazda RX-8, 91,000 mi
Check engine light came on and got this same code