Re: [DMCForum] Vacuum questions

[Martin Gutkowski - DMUK <martin@xxxxxxxxxxxxxx>]

cruznmd wrote:

> When I firewall the throttle, I lose so much vacuum the flapper
> shuts, cutting off my airflow. Also, no matter what position the
> flapper is in when I shut the car off, vacuum leaks and the flap
> falls to the shut position.

That's probably the mode switch needing a clean.

> Also, please remind me of the operation of the thermal 3-port vacuum
> switch in the coolant distribution pipe:
> 
> 1. Describe the different modes of operation @ different temps.
> 2. 1 line goes to the vacuum advance solenoid.
> 3. 1 line goes to the intake nipple for a vacuum source.
> 4. 1 line goes ????

Last one goes to CPR.

CPR gets vacuum when cold, distributor gets it when hot. CPR enriches 
under accelleration when cold, for approx 4 seconds due to the delay 
valve. Light throttle advance is desirable only when engine is hot (for 
emissions).

> How does the charcoal evaporative cannister fit into all this?

It doesn't. Sperate source of vacuum (bill's favourite).

Martin

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