Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

NO.21 ENGINE NOISE [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Is squeal, click or chirp sound present?	Yes	Inspect engine oil level or drive belts.
1	Is squeal, click or chirp sound present?	No	Go to the next step.
2	Is rumble or grind sound present?	Yes	Inspect drive belts.
2	Is rumble or grind sound present?	No	Go to the next step.
3	Is rattle sound present?	Yes	Inspect location of rattle for loose parts.
3	Is rattle sound present?	No	Go to the next step.
4	Is hiss sound present?	Yes	Inspect for following: Vacuum leakage Spark plug looseness Intake-air system leakage
4	Is hiss sound present?	No	Go to the next step.
5	Is rap or roar sound present?	Yes	Inspect exhaust system for loose parts.
5	Is rap or roar sound present?	No	Go to the next step.
6	Is knock sound present?	Yes	Go to symptom troubleshooting No.12 " ".
6	Is knock sound present?	No	If noise comes from engine internal, inspect for friction gear or MLA noise.
7	Verify test results. If okay, return to diagnostic index to service any additional symptoms. If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace PCM.