Service bulletin PIP5206A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

This Preliminary Information communication provides information to the technician about vehicles that have a knock noise at idle that diminishes as the engine revolutions per minute is increased. Technician will need to remove the accessory belt to verify noise is not accessory belt related. Technician will need to inspect the G109 for sufficient clamp load also inspect for a clean matting surface. When the knocking noise is occurring, see if the timing is being retarded and if there is knock sensor activity. Disconnect the knock sensor and see if the noise changes. If timing retards and noise changes with knock sensor disconnected, reconnect knock sensor and disconnect Manifold Absolute Pressure sensor and see if the knocking noise is affected. If noise is not affected remove both camshaft actuators and inspect if the camshaft dowel pin is damaged, if so replace actuator and camshaft. If noise is affected or no problem found with the camshaft dowel pin, remove the piston rod assemblies and check for excessive clearance in the piston pin bushing, replace as necessary.

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Engine

Listing a model year does not mean every vehicle of it is concerned: the document says which.

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