PROBLEM: 3.5L Chrysler that has an audible vacuum leak in the intake manifold area, but may not respond to carb cleaner enrichment techniques while attempting to locate. Viual inspection of hoses and lines reveals nothing.

POSSIBLE CAUSE: There is a set of plugs that block off passages under the upper intake that intersect with the grooves for the gasket. They can fall out during a repair and go undetected until reassembled. Have not found them available seperate from the upper intake. $$$

EXAMPLE: Technician “A” (not me, not here) removes plenum to replace cam position sensor, plug gets knocked out, car now has strange loud whistling noise, especially at idle, and it gets worse when warmed up. Mechanic “B” (Which I proudly prefer to call myself.) gets to search for and find mysterious noise and make money replacing expensive part.

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Tip: Vacuum leak on 3.5
Vehicle: 2004 Chrysler 300M
Category/Subcategory: Engine Performance / Vacuum Diagrams
Title/Heading: VACUUM DIAGRAMS / VACUUM DIAGRAMS
Posted By: M. Bliss
Shop: KENS SVC CTR HANOVER INC
Date: 12/31/2008

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