Emissions - Noise From A.I.R. Valves on Start-up
File In Section: 06 - Engine/Propulsion SystemBulletin No. 99-06-04-002
Date: February, 1999
TECHNICAL
Subject:
Noise From A.I.R. Valves on Start-up (Replace A.I.R. Valves)
Models:
1996-99 Chevrolet and GMC C/K Models, G Vans with A.I.R. Valves and 7.4L Engine (VIN J - RPO L29)
Condition
Some owners may comment on a honking or whining noise that lasts for a few seconds after start-up.
Cause
The air valve goes into resonance due to the air flow through it. This does not affect the ability of the vehicle to meet emissions requirements.
Correction
Install two new A.I.R. valves.
Parts Information
The new valve part number is 12562568. Parts are currently available from GMSP0.
Warranty Information
For vehicles repaired under warranty, use:
Labor 0peration Labor Time
Right
J6090 0.2 hr
Left
J6O91 0.2 hr