Skylark L4-138 2.3L DOHC VIN D MFI (1988)
Air Cleaner Fresh Air Duct/Hose: Customer Interest
Engine - Buzzing Sound At 3,000 to 4,000 RPM
Bulletin:
88-6-5
Date:
Dec., '87
Ref. No. 88-049-6
Corp. Ref. No. 876301
SUBJECT:
"BUZZING" SOUND AT 3,000 TO 4,000 RPM
MODELS AFFECTED: 1988 SKYLARKS WITH THE LD2 2.3L QUAD 4 ENGINE (VIN CODE D)
Some 1988 Skylarks with Quad 4 engines built prior to VIN JM006657 may exhibit an audible "buzz" sound between 3,000 and 4,000 rpm (usually at
close to wide open throttle).
The noise is caused by the inlet duct rattling on the air cleaner inlet. The recommended correction is to remove the inlet duct and install a "J" nut, Part
No. 11503957 on the top half of the air cleaner inlet with the threaded portion of the "J" nut on the inside (refer to illustration) and reinstall the duct over
the "J" nut. The "J" nut acts as a spring between the duct and the air cleaner to eliminate the rattle.
