Speedometer Pointer - Flutters at Certain Speeds
90chevy29Number: 90-296-8C
Section: 8C
Date: July 1990
Corp. Bulletin No.: 078307
Subject: POINTER FLUTTER - MECHANICAL ANALOG SPEEDOMETER (EXCEPT U52)
Model and Year: 1987-90 CAVALIER
TO: ALL CHEVROLET DEALERS
Some Cavaliers may develop a condition where the speedometer pointer "flutters" at certain speeds. Occasionally, this condition may be caused by insufficient speedometer cable lubrication. In this case, the flutter can be eliminated by lubricating the inner cable.
Past experience shows, however, that most speedometer flutter conditions do return, even after the inner cable has been lubricated. In these cases, the flutter was caused by some condition other than insufficient lubrication. Therefore, it is recommended to replace the speedometer cable assembly (both the inner cable and the outer cable) to eliminate the root cause of the flutter condition.
When it is necessary to replace the speedometer cable and case assembly, proper routing must be followed. The minimum bend radius is 152 mm (6 inches). Do not bend the cable to a smaller radius unless the cable has a preformed radius. Also, ensure the cable is not positioned near exhaust pipes or routed where it could be crushed by moving parts.