Re: [DML] Cruise control - no joy! (Ported Vacuum)

["content22207" <brobertson@xxxxxxxxxxxx>]

That line is ported by the throttle plates. It's active whenever
they're open (which of course means you could use it to operate the
spark advance diaphragm in lieu of the cutoff solenoid). 

If your cruise control doesn't have its own vacuum canister you indeed
want to tap into the HVAC canister, *AFTER* the check valve.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Ryan Wright <ryanpwright@xxxx> wrote:
> >> Ryan, you mentioned in earlier posts when you were trying to get
> >> your unit working that you had insufficient vacuum. What were you
> >> readings and how did you fix it? I am tied in at the location you
> >> suggested on your site.
> 
> My vacuum problem was due to initially tying into the wrong vacuum
> line. I tapped into a line going to the charcoal canister by mistake,
> the cruise worked at first but then later did not. Turns out that line
> isn't under vacuum all of the time -- oops. So I found the "real"
> vacuum line, which is the big line going into the left pontoon (by
> itself). After changing that the cruise worked flawlessly.
> 
> You can test for a vacuum problem with a hand held pump. I paid about
> $20 or so for mine at Schuck's. I hooked it up to the cruise, ran the
> line through the firewall into the passenger compartment, pumped the
> sucker up and went for a drive. The cruise worked fine like this, so I
> knew vacuum was my problem. If you suspect a vacuum problem this is a
> great test.
> 
> Also double check your dip switches... 
> 
> -Ryan
> 
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