| Speaking of the Rostra CC [message #162773] |
Mon, 12 March 2012 17:50  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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Ever since I installed the EFI, the CC surges. Why, and what can I do to settle it down?
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Speaking of the Rostra CC [message #162774 is a reply to message #162773] |
Mon, 12 March 2012 18:06  |
James Hupy
Messages: 6806
Registered: May 2010
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Larry, try lengthening the beaded chain a ball at a time and see if that
will help. If that has no effect, I would suspect a vacuum leak under the
throttle body, particularly if you have a 4 barrel to 2 barrel adapter
plate under the throttle body.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Mon, Mar 12, 2012 at 3:50 PM, Larry <weidnerl@wwt.net> wrote:
>
>
> Ever since I installed the EFI, the CC surges. Why, and what can I do to
> settle it down?
> --
> Larry :)
> 78 Royale w/500 Caddy
> Menomonie, WI.
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Speaking of the Rostra CC [message #162778 is a reply to message #162773] |
Mon, 12 March 2012 18:46 |
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Don't know why. Don't use it. It'll settle right down.
Which reminds me of the fastest and most secure network.
Byron
Larry wrote:
>
>
> Ever since I installed the EFI, the CC surges. Why, and what can I do to
> settle it down?
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--
Byron Songer
Full-timing to enjoy the USA
Former owner but still an admirer
GMC paint schemes at -
http://www.songerconsulting.net
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| Re: [GMCnet] Speaking of the Rostra CC [message #162785 is a reply to message #162773] |
Mon, 12 March 2012 19:18 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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The problem is different hysteresis in the system, carb to FI. The cure is for The Gurus.
--johnny
'76 23' transmode norris
'76 palm beach
________________________________
From: Larry <weidnerl@wwt.net>
To: gmclist@temp.gmcnet.org
Sent: Monday, March 12, 2012 6:50 PM
Subject: [GMCnet] Speaking of the Rostra CC
Ever since I installed the EFI, the CC surges. Why, and what can I do to settle it down?
--
Larry :)
78 Royale w/500 Caddy
Menomonie, WI.
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Speaking of the Rostra CC [message #162786 is a reply to message #162773] |
Mon, 12 March 2012 20:09 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
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| Larry wrote on Mon, 12 March 2012 15:50 |
Ever since I installed the EFI, the CC surges. Why, and what can I do to settle it down?
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Where is your Rostra connected to the speedometer system? Did you have to change the VSS you were using? Did you add any speedometer cables? I had a Honda that got jumpy years ago and it was the speedo cable.
I seem to remember Rostra likes a sine wave while the EMC likes a square wave. I seem to remember Emery struggling to get everyone talking nicely.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: Speaking of the Rostra CC [message #162829 is a reply to message #162773] |
Tue, 13 March 2012 00:21 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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There is a dip switch that changes the throttle sensitivity. I do not remember which one it is but it is listed in the Rostra book. I intentionally set mine more sensitive than recommended and I get some surging.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Speaking of the Rostra CC [message #162894 is a reply to message #162862] |
Tue, 13 March 2012 19:42 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| Larry wrote on Tue, 13 March 2012 10:24 |
| Ken Burton wrote on Tue, 13 March 2012 00:21 |
There is a dip switch that changes the throttle sensitivity. I do not remember which one it is but it is listed in the Rostra book. I intentionally set mine more sensitive than recommended and I get some surging.
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The "Book"?? What book....real men throw out the book before installing....just kidding. I'm not sure I can find the book, but will look when I get home.
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I looked today and also can not find my book. It will show up a couple of years from now when I no longer need it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Speaking of the Rostra CC [message #187600 is a reply to message #162863] |
Thu, 18 October 2012 05:57 |
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wally
Messages: 643
Registered: August 2004
Location: Omaha Nebraska
Karma: 5
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| Larry wrote on Tue, 13 March 2012 10:27 |
| jasonsmith wrote on Tue, 13 March 2012 00:53 |
The use of Rostra control is prohibited with any other control and hence it might be giving you a problem.Rostra Cruise controls are authorized ones as they are manufactured from USA
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Well, I'm not using the Rostra with anything else. I have separate VSS's for Rostra and EFI. Hope I can find the Book, or someone who knows what switch to activate.
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Here is a link to Rostra's general support page.
http://www.rostra.com/rostra-support.php
Specific cruise model documentation links are at the bottom of the page. I think Form #4565 is what you want.
HTH
Wally Anderson
Omaha NE
75 Glenbrook
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