Mazda RX-8 Workshop Manual page 828

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2011 - RX-8 - Engine
NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [13B-MSP]
12 LACK/LOSS OF POWER—ACCELERATION/CRUISE
DESCRIPTION
The performance is poor under load (e.g. power down when climbing
hills).
Drive-by-wire
control system
operates in
brake override
system
Vacuum
leakage
Air leakage
from intake-air
system
Air cleaner
restriction
Air suction at
intake-air
system
(between MAF
sensor and
intake ports)
Throttle body
malfunction
Improper SSV
operation
Improper APV
operation
Improper VDI
operation (13B-
MSP (high-
power))
Improper ignition timing control
(abnormal ECT, IAT, MAF and knock
sensor signals to PCM)
Improper fuel injection control (abnormal
MAF, ECT, A/F sensor, HO2S and knock
sensor signals to PCM)
MAF sensor improper installation
Spark leakage from high-tension leads
Spark plug malfunction
Incorrect spark plug heat range
Engine overheating
Low engine compression
Engine internal
malfunction
Abnormal engine oil
condition (viscosity,
deterioration)
Low oil pressure
Excessive fuel pressure
Air mixed in oil line
Metering oil pump
malfunction