EXPERTEC TSB (87-23)
WARNING: This page is about the Cavalier Base, 2D Coupe, Automatic, which is a different variant/trim than selected.
Publication date: 1986-11-04Reference number: 87-23
EXPERTEC TSB
TECHNICAL SERVICE BULLETIN
Reference Number(s): 87-23, Date of Issue:
11/04/86
IDLE SPEED UNSTABLE - SURGE ON DESCENDING GRADES
Model(s): 1987 Chevrolet Beretta, Cavalier, Corsica with 2.0L, L-4 Engine (VIN Code 1)
Bulletin No.: Chevrolet 87-23
Date: 11/04/1986
SERVICE INFORMATION
Some early production vehicles may experience one or both of the conditions listed below. The described conditions can be improved by replacing the engine calibration PROM with a new service PROM.
CONDITIONS
- Vehicle experiences a surge when descending long grades with the throttle slightly open. This is more pronounced at higher elevations and can be present in both automatic or manual transmission equipped vehicles.
- Engine idle speed fluctuates up to 300 RPM on vehicles equipped with manual transmissions. This is more prevalent on higher mileage units.
SERVICE PROMS APPLICATIONS
| Models | Transmission | Service PROM Number |
|---|---|---|
| Cavalier | Automatic Trans. | 16071643 |
| Cavalier | Manual 4-Speed Trans. | 16071647 |
| Cavalier | Manual 5-Speed Trans. | 16071652 |
| Beretta/Corsica | Automatic Trans. | 16071656 |
| Beretta/Corsica | Manual 5-Speed Trans. | 16071661 |
Use applicable Labor Time Guide for PROM replacement.