Symptom Related Diagnostic Procedures

Hesitation during warm-up can be caused by:
- Heat stove tube disconnected.
- Vacuum diaphragm motor inoperative (open to snorkel).
- No manifold vacuum.
- Damper door does not move.
- Missing air cleaner to throttle body seal.
- Missing air cleaner cover seal or loose cover.
- Loose air cleaner.

Lack of power, sluggish, spongy, or detonation on a hot engine can be caused by:
- Damper door does not open to outside air.
- Temperature sensor doesn't bleed off vacuum.