Engine - Hesitation/Sag At Light Throttle: Overview
Number: 87-61Section: 6C
Date: JAN., 1987
Subject: ENGINE HESITATION AND SAG AT LIGHT THROTTLE ACCELERATIONS
Model and Year: 1985-87 NOVA
TO: ALL CHEVROLET DEALERS
Some 1985-87 Nova's may exhibit hesitation and sag on light acceleration. These conditions may exist at different engine coolant temperatures, therefore some customers may identify the subject condition as occurring at cold and/or warm engine conditions.
Since the repair procedure is different for a cold engine driveability condition than for a warm engine condition, it is important to identify the condition under which the customer is experiencing the engine hesitation and/or sag.
If the condition occurs mostly within the first two (2) miles of driving after an extended park period, such as overnight, then this can be considered a "cold engine" condition.
If the condition occurs at all times (continuing after the initial 2 miles) then it should be considered as a "warm engine" driveability condition, and will require the installation of a Jet Kit - EGR restrictor indicated on Page 4.
The repair actions for the two driveability conditions described above are as follows: