Home » Public Forums » GMCnet » Scary Cruise Control Experience
| Scary Cruise Control Experience [message #162892] |
Tue, 13 March 2012 19:31  |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma: 1
|
Senior Member |
|
|
I was driving through heavy LA traffic on the 405 when I suddenly discovered that my cruise control wouldn't disengage at 60 mph. I frantically tried all the obvious -- multiple hitting of the brakes, pulling up on the accelerator pedal. Braking isn't real effective in a case like this although I was able to slow some. Finally by shutting off the engine and restarting a couple of times when action demanded it -- each time the front tires "burned rubber", and with the cooperation of a couple of motorists I was able to coast off the freeway using armstrong power steering and into a side street where I could collapse.
What I discovered is that the ball chain from the cruise control diaphram had hung up on the bracket that the accelerator pedal housing terminates in. The bracket has a 90 degree bend to stiffen it with the bend pointing up and the chain passes over it. The distance between the balls in the chain somehow allowed the chain to hang up on the edge of the bracket. If the chain had been in a plastic tube to prevent this, a PO must have removed it. I created a guide over the bracket using a piece of fuel hose to allow me to proceed, and changed my pants, but I plan to deal with it more formally later.
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
|
|
|
|
|
|
| Re: Scary Cruise Control Experience [message #162900 is a reply to message #162892] |
Tue, 13 March 2012 19:59  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
| captjack wrote on Tue, 13 March 2012 18:31 |
I was driving through heavy LA traffic on the 405 when I suddenly discovered that my cruise control wouldn't disengage at 60 mph. I frantically tried all the obvious -- multiple hitting of the brakes, pulling up on the accelerator pedal. Braking isn't real effective in a case like this although I was able to slow some. Finally by shutting off the engine and restarting a couple of times when action demanded it -- each time the front tires "burned rubber", and with the cooperation of a couple of motorists I was able to coast off the freeway using armstrong power steering and into a side street where I could collapse.
What I discovered is that the ball chain from the cruise control diaphram had hung up on the bracket that the accelerator pedal housing terminates in. The bracket has a 90 degree bend to stiffen it with the bend pointing up and the chain passes over it. The distance between the balls in the chain somehow allowed the chain to hang up on the edge of the bracket. If the chain had been in a plastic tube to prevent this, a PO must have removed it. I created a guide over the bracket using a piece of fuel hose to allow me to proceed, and changed my pants, but I plan to deal with it more formally later.
|
You're not the first one to discover that unfortunately!
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
| Re: [GMCnet] Scary Cruise Control Experience [message #162928 is a reply to message #162892] |
Tue, 13 March 2012 22:20 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
|
Senior Member |
|
|
That is crazy. thank god you are alright, what a shock, if going down hill to a stop sign etc. wow~~! thank god.
On Mar 13, 2012, at 5:31 PM, Jack Christensen wrote:
>
>
> I was driving through heavy LA traffic on the 405 when I suddenly discovered that my cruise control wouldn't disengage at 60 mph. I frantically tried all the obvious -- multiple hitting of the brakes, pulling up on the accelerator pedal. Braking isn't real effective in a case like this although I was able to slow some. Finally by shutting off the engine and restarting a couple of times when action demanded it -- each time the front tires "burned rubber", and with the cooperation of a couple of motorists I was able to coast off the freeway using armstrong power steering and into a side street where I could collapse.
>
> What I discovered is that the ball chain from the cruise control diaphram had hung up on the bracket that the accelerator pedal housing terminates in. The bracket has a 90 degree bend to stiffen it with the bend pointing up and the chain passes over it. The distance between the balls in the chain somehow allowed the chain to hang up on the edge of the bracket. If the chain had been in a plastic tube to prevent this, a PO must have removed it. I created a guide over the bracket using a piece of fuel hose to allow me to proceed, and changed my pants, but I plan to deal with it more formally later.
> --
> Jack Christensen - K6ROW,
> '76 Glenbrook/Clasco - "The Silver Bullet",
> '65 Clark Cortez,
> Sebastopol, CA
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: Scary Cruise Control Experience [message #162933 is a reply to message #162900] |
Tue, 13 March 2012 22:52 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| Bob de Kruyff wrote on Tue, 13 March 2012 19:59 |
| captjack wrote on Tue, 13 March 2012 18:31 |
I was driving through heavy LA traffic on the 405 when I suddenly discovered that my cruise control wouldn't disengage at 60 mph. I frantically tried all the obvious -- multiple hitting of the brakes, pulling up on the accelerator pedal. Braking isn't real effective in a case like this although I was able to slow some. Finally by shutting off the engine and restarting a couple of times when action demanded it -- each time the front tires "burned rubber", and with the cooperation of a couple of motorists I was able to coast off the freeway using armstrong power steering and into a side street where I could collapse.
What I discovered is that the ball chain from the cruise control diaphram had hung up on the bracket that the accelerator pedal housing terminates in. The bracket has a 90 degree bend to stiffen it with the bend pointing up and the chain passes over it. The distance between the balls in the chain somehow allowed the chain to hang up on the edge of the bracket. If the chain had been in a plastic tube to prevent this, a PO must have removed it. I created a guide over the bracket using a piece of fuel hose to allow me to proceed, and changed my pants, but I plan to deal with it more formally later.
|
You're not the first one to discover that unfortunately!
|
I had the same problem once. To fix it I covered the chain with a piece of plastic tube.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: Scary Cruise Control Experience [message #162985 is a reply to message #162933] |
Wed, 14 March 2012 14:49 |
PETEinLongBeach
Messages: 90
Registered: June 2007
Location: Long Beach, CA
Karma: 0
|
Member |
|
|
I've never used the CC on my coach - not really a fan of the feature in any vehicle. Also, the chain on mine looks really loose. I'll need to investigate further, just in case the next owner tries to use it.
Pete Smay
Long Beach, CA
1977 Kingsley
|
|
|
|
| Re: [GMCnet] Scary Cruise Control Experience [message #163011 is a reply to message #162892] |
Wed, 14 March 2012 20:50 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
It originally had a metal tube over the chain. Now you know why. I once drove down the 405, I don't think I'd care to in my GMC even with everything working.
--johnny
'76 23' transmode norris
'76 palm beach
________________________________
From: Jack Christensen <captjack@sonic.net>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, March 13, 2012 8:31 PM
Subject: [GMCnet] Scary Cruise Control Experience
I was driving through heavy LA traffic on the 405 when I suddenly discovered that my cruise control wouldn't disengage at 60 mph. I frantically tried all the obvious -- multiple hitting of the brakes, pulling up on the accelerator pedal. Braking isn't real effective in a case like this although I was able to slow some. Finally by shutting off the engine and restarting a couple of times when action demanded it -- each time the front tires "burned rubber", and with the cooperation of a couple of motorists I was able to coast off the freeway using armstrong power steering and into a side street where I could collapse.
What I discovered is that the ball chain from the cruise control diaphram had hung up on the bracket that the accelerator pedal housing terminates in. The bracket has a 90 degree bend to stiffen it with the bend pointing up and the chain passes over it. The distance between the balls in the chain somehow allowed the chain to hang up on the edge of the bracket. If the chain had been in a plastic tube to prevent this, a PO must have removed it. I created a guide over the bracket using a piece of fuel hose to allow me to proceed, and changed my pants, but I plan to deal with it more formally later.
--
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
'65 Clark Cortez,
Sebastopol, CA
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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
|
|
|
|
| Re: Scary Cruise Control Experience [message #163230 is a reply to message #162985] |
Fri, 16 March 2012 22:11 |
 |
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
|
|
| PETEinLongBeach wrote on Wed, 14 March 2012 12:49 |
... Also, the chain on mine looks really loose. I'll need to investigate further, just in case the next owner tries to use it.
|
The "looseness" of the chain is supposed to be there. It keeps the CC from fully opening the secondaries.
The chain needs to be in a metal tube. It keeps the balls from catching and takes up the slack in the chain by weighing down the chain. I would NOT use anything but metal... if the length is correct, it sets on top of the intake and the cross-over.
I removed the stock CC from two coaches and have, and do not need, the metal tubes. (But they are at home.) I use the chain to install the Junkyard CC.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
|
|
|
|
| Re: Scary Cruise Control Experience [message #163238 is a reply to message #162985] |
Fri, 16 March 2012 22:54 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
| PETEinLongBeach wrote on Wed, 14 March 2012 13:49 |
I've never used the CC on my coach - not really a fan of the feature in any vehicle. Also, the chain on mine looks really loose. I'll need to investigate further, just in case the next owner tries to use it.
|
The chain needs to have just a little slack or looseness with the throttle closed on a warm engine. That is to make sure the cruise does not impede the ability of the throttle to fully close. If it is too loose, it will be lethargic and have limited authority at higher speeds. Although there is nothing wrong with the cruise trying to open the secondaries, most GMC units don't have enough power to pull them open. Mine does and it certainly helps on those long climbs.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
| Re: [GMCnet] Scary Cruise Control Experience [message #163254 is a reply to message #163230] |
Sat, 17 March 2012 08:27 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
An argument for vacuum operated CC instead of an electric servo - when the throttle plates open sufficiently, MAP rises to the point the servo won't pull any further. Sort of self - limiting.
--johnny
'76 23' transmode norris
'76 palm beach
________________________________
From: Mike Miller <m000035@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Friday, March 16, 2012 11:11 PM
Subject: Re: [GMCnet] Scary Cruise Control Experience
PETEinLongBeach wrote on Wed, 14 March 2012 12:49
> ... Also, the chain on mine looks really loose. I'll need to investigate further, just in case the next owner tries to use it.
The "looseness" of the chain is supposed to be there. It keeps the CC from fully opening the secondaries.
The chain needs to be in a metal tube. It keeps the balls from catching and takes up the slack in the chain by weighing down the chain. I would NOT use anything but metal... if the length is correct, it sets on top of the intake and the cross-over.
I removed the stock CC from two coaches and have, and do not need, the metal tubes. (But they are at home.) I use the chain to install the Junkyard CC.
--
Mike Miller -- Hillsboro, OR -- on the Black list
(#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
http://m000035.blogspot.com
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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
|
|
|
|
Goto Forum:
Current Time: Fri Oct 11 17:24:25 CDT 2024
Total time taken to generate the page: 0.01518 seconds
|
GMCforum
Search
Help
Register
Login
Home
