| [GMCnet] Vacuum Modulator [message #106017] |
Tue, 16 November 2010 13:25  |
paul h cashman
Messages: 176
Registered: May 2005
Karma: 0
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Senior Member |
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Emery,
When I said, I checked the Vacuum line ,in my Post .I was referring to the
one going to the Modulator.
Thanks for the input.
Paul
check the steel line. It might be clogged. There is a restriction in it
that can sometimes clog. Blow it out with compressed air and check to see
if you can get flow through it.
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Paul H Cashman
Riverdale Ga
1978 Transmode
1975 Corvette
1978 Beetle Convertible
1989 Harley Davidson Sportster
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| Re: [GMCnet] Vacuum Modulator [message #106025 is a reply to message #106017] |
Tue, 16 November 2010 17:43  |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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Senior Member |
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| paul h cashman wrote on Tue, 16 November 2010 13:25 |
Emery,
When I said, I checked the Vacuum line ,in my Post .I was referring to the
one going to the Modulator.
Thanks for the input.
Paul
check the steel line. It might be clogged. There is a restriction in it
that can sometimes clog. Blow it out with compressed air and check to see
if you can get flow through it.
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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the OEM setup has a rubber hose connected to a steel tube up to the top of the engine then a rubber hose to the manifold.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] Vacuum Modulator [message #106036 is a reply to message #106025] |
Tue, 16 November 2010 20:54 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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I recently studied my engine vacuum lines to-death, I plan to do some major
"clean up" work on them.
As I understand it, the Transmission vacuum modulator line connects directly to
the intake manifold on the drivers side of the engine. I've been told to check
the steel line, it can rust out at the clips and develop holes, thus no vac at
the modulator. I was told that if it was rusted and leaking to replace it with
a good new hose routed away from any high heat sources.
Ray
Ray & Lisa Erspamer
78 Royale Center Kitchen
TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: fred veenschoten <fredntoni@cox.net>
To: gmclist@temp.gmcnet.org
Sent: Tue, November 16, 2010 6:43:01 PM
Subject: Re: [GMCnet] Vacuum Modulator
paul h cashman wrote on Tue, 16 November 2010 13:25
> Emery,
> When I said, I checked the Vacuum line ,in my Post .I was referring to the
> one going to the Modulator.
> Thanks for the input.
>
> Paul
>
> check the steel line. It might be clogged. There is a restriction in it
> that can sometimes clog. Blow it out with compressed air and check to see
> if you can get flow through it.
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
the OEM setup has a rubber hose connected to a steel tube up to the top of the
engine then a rubber hose to the manifold.
--
Fred V
'77 Royale RB 455
P'cola, Fl
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Vacuum Modulator [message #106044 is a reply to message #106036] |
Tue, 16 November 2010 22:36 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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You do not want to just replace the metal line with a piece of hose.
The original line has a factory crimp in it to act as a damper of the
vacuum signal. This line has been known to plug up and you should run
some carb cleaner thru it clean the carbon out of it and blow with
air to clear. The bottom section of rubber hose can be replaced if bad.
JR Wright
On Nov 16, 2010, at 9:54 PM, Ray Erspamer wrote:
> I recently studied my engine vacuum lines to-death, I plan to do
> some major
> "clean up" work on them.
>
> As I understand it, the Transmission vacuum modulator line connects
> directly to
> the intake manifold on the drivers side of the engine. I've been
> told to check
> the steel line, it can rust out at the clips and develop holes, thus
> no vac at
> the modulator. I was told that if it was rusted and leaking to
> replace it with
> a good new hose routed away from any high heat sources.
>
> Ray
>
>
> Ray & Lisa Erspamer
> 78 Royale Center Kitchen
> TZE368V101144
> Wauwatosa, Wisconsin 53226
> Email: 78GMC-Royale@att.net
> 414-745-3188
> Web Site: http://ray-lisa.page.tl/
>
>
>
>
> ________________________________
> From: fred veenschoten <fredntoni@cox.net>
> To: gmclist@temp.gmcnet.org
> Sent: Tue, November 16, 2010 6:43:01 PM
> Subject: Re: [GMCnet] Vacuum Modulator
>
>
>
> paul h cashman wrote on Tue, 16 November 2010 13:25
>> Emery,
>> When I said, I checked the Vacuum line ,in my Post .I was referring
>> to the
>> one going to the Modulator.
>> Thanks for the input.
>>
>> Paul
>>
>> check the steel line. It might be clogged. There is a restriction
>> in it
>> that can sometimes clog. Blow it out with compressed air and check
>> to see
>> if you can get flow through it.
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> the OEM setup has a rubber hose connected to a steel tube up to the
> top of the
> engine then a rubber hose to the manifold.
>
> --
> Fred V
> '77 Royale RB 455
> P'cola, Fl
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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