Engine Controls - Cold Engine Rattling Noise: Overview
01-004/032001-2003 Protege, 2002-2003 Protege5 - RATTLING NOISE AT 1000 - 3000 RPM COLD ENGINE
Note:
This bulletin contains revised sections. Please update your records accordingly.
REVISION NOTE:
^ This bulletin supersedes 01-004/03, issued 3/18/03. The 2003 Model Year Protege5 has been included and VIN range information under REPAIR PROCEDURE has been revised.
APPLICABLE MODEL(S)/VINs
2001-2003 Protege (2.0L FS only)
2002-2003 Protege5
DESCRIPTION
Some customers may experience an engine rattle noise under light to moderate acceleration with engine coolant temperatures below 65 C (149 F) and engine RPMs between 1000 and 2900 RPM.
The noise is the result of the intentional swirl effect that is generated when the Variable Tumble Control System (VTCS) plates in the intake manifold are closed. Swirl accelerates the burn of the air/fuel mixture which reduces emissions when the engine is cold. The noise does not have a negative effect on the engine, and disappears as soon as coolant temperature reaches 65 C (149 F). There is a counter-measure to help reduce the noise in order to improve customer satisfaction.
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