Mazda RX-8 Workshop Manual page 736

POSSIBLE
CAUSE
system
Air cleaner
restriction
Air suction at
intake-air
system
(between MAF
sensor and
intake ports)
Improper
operation of
drive-by-wire
control system
(abnormal
accelerator
position and TP
signals to PCM)
Throttle body
malfunction
(stuck close)
Improper SSV
operation
Improper APV
operation
Poor fuel
quality
Inadequate fuel
pressure
Fuel pump
mechanical
malfunction
Fuel leakage
from fuel
injector
Fuel injector
clogging
Fuel line
restriction or
clogging
Pressure
regulator
(integrated in
fuel pump unit)
malfunction
Low engine compression
Engine internal
malfunction
Abnormal engine oil
condition (viscosity,
deterioration)
Low oil pressure
Excessive fuel injector
Air mixed in oil line
Metering oil pump
malfunction
Metering oil pump malfunction
Improper metering oil pump control
operation
Engine overheating
Spark leakage from high-tension leads
Spark plug malfunction
Improper A/C system operation
Improper torque converter clutch control
operation (AT)
Improper shift point (AT)
AT malfunction (AT)
Clutch slippage (MT)
Leakage
or
clogging
in oil
pipe
Leakage
or
clogging
in oil
nozzle