Vacuum Modulator
NOTE:
A faulty vacuum modulator can cause:
- Harsh upshift and downshifts.
- Delayed upshifts.
- Soft upshifts and downshifts.
- Slips in "L", "D" and "R".
- Transmission overheating.
- Burnt transmission fluid.
- Remove modulator. Hold modulator so vacuum fitting points downward. Replace modulator if full of transmission fluid.
- Connect vacuum pump. Apply 20 In. Hg of vacuum. Ensure modulator operates and holds vacuum. Replace if necessary.