Home » Public Forums » GMCnet » Cruise control help
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| Re: [GMCnet] Cruise control help [message #201129 is a reply to message #201123] |
Sat, 09 March 2013 14:15   |
mickeysss
Messages: 1476
Registered: January 2012
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i have heard horror stories about the cruise control on these and if the engine revs and will not stop and if you turn the engine off no brakes.???
mickey :-0
77 palm beach
anaheim ca.
manny took mine off when he put in the trans. I did not ask why but i do not drive that much yet anyway. It has a chain that sticks somehow?
I never use it much anyway. It is a please to be able to dance while driving but i do not trust these things ever anytime to much.
i know little about it - but it is trouble.
On Mar 9, 2013, at 11:02 AM, R.D. Hart wrote:
>
>
> 2 questions here, first my stock cruise control comes on when set, but then "pulses" diaphram moves in and out reving the engine, doesn't stay steady. Would that be the transducer?
> Second, I have a used rostra unit I removed from a parts coach. I even have the installation booklet. Hooked it all up, it comes on but immediately takes off reving the engine, at which point I shut it down so not to overrev.
> Now I'm testing both units with the front on stands and the wheels removed. Would this be caused by no road resitance?
> No big deal, if this unit does not work, I'll just toss it, it was free, but before I unhook everything, I thought I'd get some opinions. Thanks
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| Re: [GMCnet] Cruise control help [message #201131 is a reply to message #201129] |
Sat, 09 March 2013 14:41 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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On the original cruise control the pull chain was run through a tube to prevent the problem you describe. With the tube removed the chain can get stuck. Replace the tube. The tube left about 2" of uncovered chain on each end. It can be made out of anything. A piece of wiring spaghetti or shrink tubing will work. I believe the original was metal.
| mickeysss wrote on Sat, 09 March 2013 14:15 |
i have heard horror stories about the cruise control on these and if the engine revs and will not stop and if you turn the engine off no brakes.???
mickey :-0
77 palm beach
anaheim ca.
manny took mine off when he put in the trans. I did not ask why but i do not drive that much yet anyway. It has a chain that sticks somehow?
I never use it much anyway. It is a please to be able to dance while driving but i do not trust these things ever anytime to much.
i know little about it - but it is trouble.
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Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Cruise control help [message #201133 is a reply to message #201123] |
Sat, 09 March 2013 14:49 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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IMHO, the best CC option is the ElectroMotor II used in a gazillion GM
vehicles of the 90's. John Sharpe documented the installation here:
http://www.gmcmhphotos.com/photos/g4776-cruise-control-ac-delphi-electro-motor.html
I wasn't skilled or patient enough to do the switch modifications John did,
so I just used a 2-channel Transmitter/Receiver pair to provide the Set &
Coast switches, mounting the remote to a spoke of my steering wheel with
double-sided tape. It's run 5+ years without a battery change.
It has all the features of any modern CC, with none of the noise problems
some have had with the far more expensive Rosta.
About $15 at the junk yard plus about $13.50 for the Tx/Rx unit, and
another $20-$70 for a 4K VSS (there are junkyard options for that, but I
never tried them).
Ken H.
On Sat, Mar 9, 2013 at 2:02 PM, R.D. Hart wrote:
>
> ...
> No big deal, if this unit does not work, I'll just toss it, it was free,
> but before I unhook everything, I thought I'd get some opinions. Thanks
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Cruise control help [message #201138 is a reply to message #201129] |
Sat, 09 March 2013 15:27 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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That is a common occurrance with early GM cruise controls like the GMC ones when you neglect to put the tube over the chain going to the carb linkage. The chain can catch on any number of things on top of the engine. As long as nothing's binding, the dump valve on the brake pedal will let the diaphragm relax and the throttle will close.
--johnny
'76 23' transmode norris
'76 palm beach.
From: Mickey Space Ship Shuttle <mickeysss@me.com>
To: gmclist@temp.gmcnet.org
Sent: Saturday, March 9, 2013 3:16 PM
Subject: Re: [GMCnet] Cruise control help
i have heard horror stories about the cruise control on these and if the engine revs and will not stop and if you turn the engine off no brakes.???
mickey :-0
77 palm beach
anaheim ca.
manny took mine off when he put in the trans. I did not ask why but i do not drive that much yet anyway. It has a chain that sticks somehow?
I never use it much anyway. It is a please to be able to dance while driving but i do not trust these things ever anytime to much.
i know little about it - but it is trouble.
On Mar 9, 2013, at 11:02 AM, R.D. Hart wrote:
>
>
> 2 questions here, first my stock cruise control comes on when set, but then "pulses" diaphram moves in and out reving the engine, doesn't stay steady. Would that be the transducer?
> Second, I have a used rostra unit I removed from a parts coach. I even have the installation booklet. Hooked it all up, it comes on but immediately takes off reving the engine, at which point I shut it down so not to overrev.
> Now I'm testing both units with the front on stands and the wheels removed. Would this be caused by no road resitance?
> No big deal, if this unit does not work, I'll just toss it, it was free, but before I unhook everything, I thought I'd get some opinions. Thanks
> _______________________________________________
> 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:
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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: [GMCnet] Cruise control help [message #201624 is a reply to message #201129] |
Wed, 13 March 2013 23:13 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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The original system can be very serviceable and has no basic design related issues--in fact it is easily convertible to a resume system with minimal expense. Contrary to some opinions, transducers are still a dime a dozen in pick and pull yards. Of course a Rostra system is fine but involves several modifications and more $$$.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Cruise control help [message #201632 is a reply to message #201624] |
Thu, 14 March 2013 07:03 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I find the lack of resume leads me to leave more room around the coach on the road, and set it a bit lower than I do my van or truck - a backhanded safety feature, if you will.
--johnny
'76 23' transmode norris
'76 palm beach
________________________________
From: Bob de Kruyff <NEXT2POOL@AOL.COM>
To: gmclist@temp.gmcnet.org
Sent: Thursday, March 14, 2013 12:13 AM
Subject: Re: [GMCnet] Cruise control help
The original system can be very serviceable and has no basic design related issues--in fact it is easily convertible to a resume system with minimal expense. Contrary to some opinions, transducers are still a dime a dozen in pick and pull yards. Of course a Rostra system is fine but involves several modifications and more $$$.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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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: Cruise control help [message #201646 is a reply to message #201123] |
Thu, 14 March 2013 09:20 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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A semi-related question... is there any adjustment that can reduce the "speed surge" that occurs when setting the cruise control? I remember that the 70's GM CC would always pick up at least a little speed when you set it, but my GMC will gain at least 3-4mph. It's a fairly minor annoyance, but requires me to slow down to set the CC, then let it accelerate up to the desired speed (plus or minus a mph or so). Not the most efficient way to do things...
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] Cruise control help [message #201651 is a reply to message #201646] |
Thu, 14 March 2013 09:55 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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You guys need to quit "dinking around" with your cruise controls, cancel
your turn signal that has been flashing for the last 7 miles, leave your CD
player and CB radio alone. Put both hands on the steering wheel and your
eyes on the road and just drive. Might spend a little time checking your
rear view mirrors, too.(VERY BIG GRIN)
Jim Hupy
Salem,Or
78 Gmc Royale 403
On Mar 14, 2013 7:20 AM, "Mark" <mark@habcycles.com> wrote:
>
>
> A semi-related question... is there any adjustment that can reduce the
> "speed surge" that occurs when setting the cruise control? I remember that
> the 70's GM CC would always pick up at least a little speed when you set
> it, but my GMC will gain at least 3-4mph. It's a fairly minor annoyance,
> but requires me to slow down to set the CC, then let it accelerate up to
> the desired speed (plus or minus a mph or so). Not the most efficient way
> to do things...
> --
> Mark Hickey
> Mesa, AZ
> 1978 Royale Center Kitchen
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: Cruise control help [message #201688 is a reply to message #201123] |
Thu, 14 March 2013 15:32 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Mark, I asked same here a while back and there was a very good reply on which screw to turn and which way to turn it to zero out the set point. I haven't adjusted yet but on the to do list. I'll search when at real computer not iPhone.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Cruise control help [message #201700 is a reply to message #201123] |
Thu, 14 March 2013 20:29 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Thanks, John... I didn't find that info in a search, but will happily wait 'til I hear from you.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] Cruise control help [message #201754 is a reply to message #201626] |
Fri, 15 March 2013 21:38 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| Les Burt wrote on Wed, 13 March 2013 23:37 |
On 2013-03-14, at 12:13 AM, Bob de Kruyff <NEXT2POOL@AOL.COM> wrote:
> Contrary to some opinions, transducers are still a dime a dozen in pick and pull yards.
Bob perhaps you could tell us what vehicles have these transducers when we are shopping.
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Les--I've sort of forgotten which vehicles started to move to electronic cruise and when. It was mostly based on when new platforms were introduced so we will find a lowly Chevrolet with electronic cruise when a Buick will still have the mechanical cruise. Regardless, the traditional mechanical units are easy to spot if you have access to pick and pulls or conventional junk yards. They are almost almost all located on the driver's side inner fender and will have either a 2 or 3 pin connector on the top. Either type will work but only the 3 pin will activate the cruise light on the dash. If you do find them, spin the input shaft to see if it is free. If so, you are pretty well sure it works.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Cruise control help [message #202023 is a reply to message #201646] |
Mon, 18 March 2013 10:40 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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| habbyguy wrote on Thu, 14 March 2013 07:20 |
A semi-related question... is there any adjustment that can reduce the "speed surge" that occurs when setting the cruise control? I remember that the 70's GM CC would always pick up at least a little speed when you set it, but my GMC will gain at least 3-4mph. It's a fairly minor annoyance, but requires me to slow down to set the CC, then let it accelerate up to the desired speed (plus or minus a mph or so). Not the most efficient way to do things...
|
Mark,
The adjustment you are looking to do is on the transducer. The nipple that the vacuum line attaches to is adjustable. There is a lock nut on it. Loosen the lock nut and turn the nipple in, to reduce the speed, out to increase speed. The instructions I received with my rebuilt transducer (from Applied GMC) stated something like a quarter turn per MPH. I found that to be too much, and had to do a 'hit or miss' adjustment at several stops, before I got it right. My cruise works flawlessly now after replacing the transducer, a torn servo, and the turn signal stalk switch.
There was a suggestion made on here to set the turn-on point so that you gain about two MPH when you stab the switch. This allows you an easy way to adjust the speed up a little as needed, without having to use the gas pedal. I haven't done that, and just set the speed to where I want to be and let it go at that.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Cruise control help [message #202090 is a reply to message #201754] |
Mon, 18 March 2013 23:38 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Ok, can I safely assume that I should be looking at early to mid 70s vehicles only or was this unit used up into the early 80s? I don't seem to recall seeing them on any of the 80s era GM products I tinkered on when I was fresh out of school.
Les Burt
Montreal
On 2013-03-15, at 10:38 PM, Bob de Kruyff <NEXT2POOL@AOL.COM> wrote:
>
>
> Les Burt wrote on Wed, 13 March 2013 23:37
>> On 2013-03-14, at 12:13 AM, Bob de Kruyff <NEXT2POOL@AOL.COM> wrote:
>>
>>> Contrary to some opinions, transducers are still a dime a dozen in pick and pull yards.
>>
>>
>> Bob perhaps you could tell us what vehicles have these transducers when we are shopping.
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> Les--I've sort of forgotten which vehicles started to move to electronic cruise and when. It was mostly based on when new platforms were introduced so we will find a lowly Chevrolet with electronic cruise when a Buick will still have the mechanical cruise. Regardless, the traditional mechanical units are easy to spot if you have access to pick and pulls or conventional junk yards. They are almost almost all located on the driver's side inner fender and will have either a 2 or 3 pin connector on the top. Either type will work but only the 3 pin will activate the cruise light on the dash. If you do find them, spin the input shaft to see if it is free. If so, you are pretty well sure it works.
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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