Ignition Timing Control - Except Civic — 1979 Honda Prelude Automatic Trans Service Manual ~ LEMON Manuals

Vacuum Hose At Distributor Does Not Hold Vacuum
- 1977 Type 1 System
No Vacuum At Advance Hose At Idle
- 1978-79 Type 1 System (Except Auto. Trans. Civic)
Vacuum Appears At Idle When Engine Is At Normal Operating Temperature
Less Than 12 In. Hg At Advance Hose At Idle
- 1978-79 Type 1 System (Auto. Trans. Civic)
No Vacuum At Advance Diaphragm At 3000 Rpm
- 1978-79 Type 1 System (Auto. Trans. Civic)
Vacuum Present At Retard Side Of Distributor With Cold Engine At Idle
- 1977-79 Type 2 System (All Models)
Vacuum Present At Advance Side Of Distributor With Cold Engine At Idle
- 1977 Type 2 System (Civic Only)
No Vacuum At Advance Side Of Distributor With Cold Engine At Idle
- 1978-79 Type 2 System (Accord & Prelude)
- 1978-79 Type 2 System (Civic)
No Vacuum At Retard Or Advance Side Of Distributor Diaphragm With Hot Engine At Idle
- 1977 Type 2 System (All Models)
- 1978-79 Type 2 System (All Models)
Retard Vacuum Does Not Shut Off When Vacuum Reaches 7.5-8.7 In. Hg Of Vacuum
- 1978-79 Type 2 System (All Models)