Mazda RX-8 Workshop Manual page 773

STEP INSPECTION
1 Is a squeal, click or chirp
sound present?
2 Is a rumble or grinding
noise present?
3 Is a rattle noise present?
4 Is a hissing noise present?
5 Is a rap or roar noise
present?
6 Is a knocking noise
present?
7 Verify test results.
RESULTS
Yes Inspect the engine oil level or drive belts.
No Go to the next step.
Yes Inspect the drive belts.
No Go to the next step.
Yes Inspect the location of rattle for loose parts.
No Go to the next step.
Yes Inspect the following:
Vacuum leakage
Spark plug looseness
Intake–air system leakage
VFAD control system operation (with VFAD)
(See
INSPECTION
No Go to the next step.
Yes Inspect the exhaust system for loose parts.
No Go to the next step.
Yes Go to the symptom troubleshooting "NO.13
KNOCKING/PINGING/DETONATION-ACCELERATION/CRUISE".
(See NO.13 KNOCKING/PINGING/DETONATION-
ACCELERATION/CRUISE
No If the noise comes from the engine internally, inspect for oil pump
drive gear or chain noise.
ACTION
ENGINE CONTROL SYSTEM OPERATION
[13B-MSP].)
[13B-MSP].)