Ciera V6-173 2.8L VIN W FI (1986)
Valve Body: Customer Interest
A/T - Throttle Valve Buzz
SUBJECT
THROTTLE VALVE BUZZ ON 125C TRANSAXLE
NUMBER: 86-T-31
DATE:
April 16,1986
MODELS/YEARS
EARLY 1986 CUTLASS CIERA MODELS WITH
SECTION: 7A
2.8L MPFI ENGINE (VIN CODE W)
FIGURE 1
A 1986 THM 125C model CTC or CXC transaxle built prior to October 29, 1985 (Julian date 302) in Windsor may exhibit a throttle valve buzz
condition. This buzz condition may be felt in the accelerator pedal.. Refer to Figure 1 for transaxle identification information.
On October 29, 1985, a new valve body to case cover spacer plate was introduced to eliminate the buzz by reducing the diameter of the 1-2 accumulator
valve feedback orifice.
To correct a throttle valve buzz condition for models built before October 29, 1985, replace the original valve body to case cover spacer plate with new
spacer plate part no. 8660569.
Refer to the appropriate Service Manual for removal and installation procedures.
NOTE:
This spacer plate is for 2.8L engine (VIN Code W) applications only. If installed in another 125C model, a harsh 1-2 shift may result.
