Engine - Noise/Rough Idle/Reduced Power

89Chevy29

GMC NUMBER: 89-T-76


GROUP: 6A - Engine Mechanical

DATE: July, 1989


CORPORATE
NUMBER: 936102R
SUBJECT: ENGINE NOISE/ROUGH IDLE/REDUCED POWER

MODELS: 1987-89 S/T TRUCK AND M VAN W/2.5L ENGINE (VIN CODE E)



Comments regarding rough idle/engine noise/low power following removal of the intake manifold on 2.5L engines have been traced to the intake manifold bolt spacer not being reinstalled (see illustration on reverse side for location). The spacer prevents interference between the intake manifold bolt and the # 4 cylinder intake pushrod. If this condition is encountered, reinstalling the intake manifold bolt spacer in the correct location and replacing the # 4 cylinder intake pushrod will restore engine performance.
If the spacer is missing, a spacer can be made by using two flat washers, P/N 331247 (3/8" I.D. x 3/4" O.D. x 1/8"). Place both washers on the bolt, install bolt and torque to 28-40 N-m (22-30 ft.lbs.). When making these repairs within the provisions of the vehicle warranty, use:

Labor Operation: T7975 "Reinstall Intake Manifold Spacer, and Replace # 4 Intake Push Rod"

Labor Time: "M" Van - 1.2 Hrs
S/T - . 9 Hr.