| Re: [GMCnet] Transmission downshifting [message #290107 is a reply to message #290102] |
Sun, 08 November 2015 12:41   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
|
Senior Member |
|
|
The drop in vacuum through the cruse control , if located close to the
transmission modulator connection at the intake can cause that problem.
If nothing else look at the connection at the intake manifold and see that
it is a dedicate one, not sharing with another.
On Sun, Nov 8, 2015 at 6:40 AM, Bruce Hart wrote:
> Tom,
>
> Like gene states"Go Here"
> http://gmcws.org/blog/
>
> Than "Go Here"
> http://www.bdub.net/
>
> "Here"
> http://www.bdub.net/GMCLinks.html
>
> Scroll down and open Manuals
>
> Scroll down to bottom of page and open:
> THM425 Trouble Shooting 1973
>
> Go to page 11 in manual for a flow chart.
>
>
>
>
>
>
> On Sun, Nov 8, 2015 at 6:57 AM, tom geiger wrote:
>
>> I noticed coming back from camping last weekend my motorhome would
>> downshift from 3rd to 2nd doing 50 mph and it wouldn't shift up to 3rd
>> until I
>> manually went down to 2nd and then back up to D and then it would kick up
>> to 3rd. I've check the transmission fluid and it seems to be good level
> . I
>> have noticed a hissing noise under the dash when I let off the brake. I
>> have had trouble with mice in the coach and am wondering if those little
>> s$&ts
>> have chewed on something that has caused a vacuum issue? Anyone
> experience
>> a hissing noise related to the brake peddle coming back up after use. It
>> does stop hissing when peddle comes back up after I pressed on it.
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
