Home » Public Forums » GMCnet » Trouble Shooting Cruise Control
| Trouble Shooting Cruise Control [message #257810] |
Mon, 04 August 2014 19:34  |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
|
Senior Member |
|
|
Is there a step by step procedure for trouble shooting the cruise control?
Thanks group!!
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
|
|
|
|
|
|
|
|
| Re: [GMCnet] Trouble Shooting Cruise Control [message #257830 is a reply to message #257828] |
Mon, 04 August 2014 21:24  |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
|
Senior Member |
|
|
bdub wrote on Mon, 04 August 2014 19:08The best fix for the cruise control is here:
http://www.appliedgmc.com/prod.itml/icOid/883
Imho, bdub
Thanks bdub, but if I told the CFO I wanted to spend $340 because I don't want to watch the speedo she would laugh at me and tell me I don't need it. I had to trick her to buy my GMC in the first place. I told her I was going to flip it, never told her about my adoration of these coaches. Once I got it, I knew it was going to be in my driveway or garage for many years to come.
I know I probably have a bad part or maybe something as simple as the switch. I am going to try to keep it as simple as possible. And as cost effective as possible cause I have to sleep next to her every night. LOL.
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257831 is a reply to message #257823] |
Mon, 04 August 2014 21:25 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
|
Senior Member |
|
|
A Hamilto wrote on Mon, 04 August 2014 18:45lotsofspareparts wrote on Mon, 04 August 2014 19:34Is there a step by step procedure for trouble shooting the cruise control?
Thanks group!!
Jared The Maintenance Manual for your year model has a very detailed explanation of every component of the system, as well as troubleshooting guides for BOTH the vacuum operated and the electrical portions of the system.
Download yours from http://www.bdub.net/factory-manuals.html
Is that in the supplemental manual for 77-78. I have it but it is out in the coach.
Thanks for the link.
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
|
|
|
|
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257838 is a reply to message #257810] |
Mon, 04 August 2014 22:31 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
lotsofspareparts wrote on Mon, 04 August 2014 18:34Is there a step by step procedure for trouble shooting the cruise control?
Thanks group!!
Jared
I did something for the Eastern States years ago--maybe Ken H remembers where it is ( I think it was the Eastern states)
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257839 is a reply to message #257810] |
Mon, 04 August 2014 22:37 |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma: 3
|
Senior Member |
|
|
Jared,
It sounds like electrical first of all, from some troubleshooting posts I dimly remember. Get that light lighting first of all. I may have a spare vacuum can assembly I can send you for postage if it gets that far. The other way to do it is to look in the photo album site accessible through bdub.net and see that some junkyard parts from a '90s GM setup could give you a cruise much modernized with digital control with a stepper motor. I am just not fond of the electric - vacuum GM setup, but I have to admit it is ingenious. You have to use a sending unit connected to the speedometer connection, or perhaps you can get information from your present injection setup.
One thing I was wondering about and that's how your switch pitch transmission was doing. Secondly, note that Manny Travao recommends synthetic fluid for the transmission with the switch pitch feature as they tend to run hotter in some conditions.
Best,
Carey
Carey from Ennis, Texas
78 Royale, 500 Cadillac, Rance Baxter EFI.
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257843 is a reply to message #257810] |
Mon, 04 August 2014 22:45 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
lotsofspareparts wrote on Mon, 04 August 2014 18:34Is there a step by step procedure for trouble shooting the cruise control?
Thanks group!!
Jared
The original system can work very well with just a bit of trouble shooting. In most cases you won't need to spend a penny. You can even add a resume feature for a few bucks. I'll try to find the write up I did a few years ago. It may not show up on some of our links since the trend seems to be give up and buy a new system.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257846 is a reply to message #257810] |
Mon, 04 August 2014 23:00 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
|
Senior Member |
|
|
lotsofspareparts wrote on Mon, 04 August 2014 17:34Is there a step by step procedure for trouble shooting the cruise control?
Thanks group!!
Jared
Like you, I didn't feel that an upgraded cruise control was a necessity. I DID, however, want the original cruise to work. The main problem with mine turned out to be the switch on the stalk. I was given a known good one by my mechanic friend, to use as a diagnostic tool, and later I was given a good switch by a GMC friend that did the upgrade.
In the mean time, I rerouted the ground directly to the engine (bolt on the back of the left head), replaced the transducer with a rebuilt one from Jim K (not sure if that was needed, but it sure couldn't hurt), and I replaced the vacuum servo with a used one from Jim K after I poked a hole in the diaphragm on the original. After getting it adjusted correctly, a hit or miss procedure involving turning the nipple on the vacuum input on the transducer, it works like new. Good enough for me. I plan to try Bob's resume feature trick someday, but for now, I'm just thankful that it works.
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
|
|
|
|
| Re: [GMCnet] Trouble Shooting Cruise Control [message #257847 is a reply to message #257830] |
Mon, 04 August 2014 23:01 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Jared,
Here's much cheaper, and perhaps better, solution:
http://www.gmcmhphotos.com/photos/g4776-cruise-control-ac-delphi-electro-motor.html
Ken H.
On Mon, Aug 4, 2014 at 10:24 PM, Jared wrote:
> bdub wrote on Mon, 04 August 2014 19:08
>> The best fix for the cruise control is here:
>> http://www.appliedgmc.com/prod.itml/icOid/883
>> Imho, bdub
>
>
> Thanks bdub, but if I told the CFO I wanted to spend $340 because I don't
> want to watch the speedo she would laugh at me and tell me I don't need
> it.
>
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
|
|
|
|
| Re: [GMCnet] Trouble Shooting Cruise Control [message #257852 is a reply to message #257847] |
Tue, 05 August 2014 00:39 |
GMC Cruse
Messages: 606
Registered: June 2009
Location: SE Michigan
Karma: 3
|
Senior Member |
|
|
Bob's write-up:
Why doesn't my cruise control work?
A few quick things to try: if it doesn't actuate at all, does the green light on the dash go on--if not then it is probably electrical. Check the fuse and next while driving, pull up on the brake pedal with your toe and see if that lets it engage--it may be a mis-adjusted brake switch. If the light comes on but no engagement, I would first check the vacuum diaphragm. Flip up the engine cover and it is a circular part right at the rear edge a little to the left of center of the opening.Take off the air-cleaner and see if the link from the diaphragm is connected to the carburetor throttle lever and you can take your fingers and compress or pull in the diaphragm--the throttle should move. If all of that works, then check all the vacuum lines. The big hose from the back of the diaphragm is notorious for coming off. Follow that hose to the actuator which is right next to it but sort of hidden behind the opening. Check all the hoses that go to it to see if they are connected and not cracked. Also check to see if the electrical plug is hooked up. If all of those things are ok--it gets a little more complicated, but is usually the transducer. Does your speedo work and if so does it fluctuate a lot--if so, the fluctuation is usually due to a failed transducer. If the speedo doesn't work it is probably due to a broken speedo cable which drives the transducer. Try those things first, but there are a few more things to try before spending any money. The transducer is used on a lot of GM cars from that era and later--it has an extra terminal to activate the dash light and is used on most cars such as Buicks and Oldsmobiles that use a dash light. Bob de Kruyff (6-11-03)
Mike K.
'75 PB
Southeast Michigan
|
|
|
|
| Re: [GMCnet] Trouble Shooting Cruise Control [message #257853 is a reply to message #257847] |
Tue, 05 August 2014 00:42 |
Guy Lopes
Messages: 499
Registered: April 2004
Location: Sacramento, CA
Karma: 3
|
Senior Member |
|
|
Now ya got me thinking about this version. I love DIY!
John Sharpe did a great slide show about this option. Easy read and it seems
to be very complete. I really like to upload PDF files to my iPad for
offline viewing, so I created a pdf file from John's slide show photos. No
formatting done. I have uploaded that file here:
http://www.gmcmhphotos.com/photos/guy-s-album/p55443-pdf-of-j-sharpe-cruise.
html
Guy Lopes
76 Birchaven "Orion"
Sacramento, CA
W6TOL
www.GMC-Guy.com
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Monday, August 04, 2014 9:01 PM
To: gmclist
Subject: Re: [GMCnet] Trouble Shooting Cruise Control
Jared,
Here's much cheaper, and perhaps better, solution:
http://www.gmcmhphotos.com/photos/g4776-cruise-control-ac-delphi-electro-mot
or.html
Ken H.
On Mon, Aug 4, 2014 at 10:24 PM, Jared wrote:
> bdub wrote on Mon, 04 August 2014 19:08
>> The best fix for the cruise control is here:
>> http://www.appliedgmc.com/prod.itml/icOid/883
>> Imho, bdub
>
>
> Thanks bdub, but if I told the CFO I wanted to spend $340 because I
> don't want to watch the speedo she would laugh at me and tell me I
> don't need it.
>
>
_______________________________________________
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
Guy Lopes
76 Birchaven "Orion"
Sacramento, CA
W6TOL
www.GMC-Guy.com
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257899 is a reply to message #257839] |
Tue, 05 August 2014 17:53 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
|
Senior Member |
|
|
cbryan wrote on Mon, 04 August 2014 20:37Jared,
It sounds like electrical first of all, from some troubleshooting posts I dimly remember. Get that light lighting first of all. I may have a spare vacuum can assembly I can send you for postage if it gets that far. The other way to do it is to look in the photo album site accessible through bdub.net and see that some junkyard parts from a '90s GM setup could give you a cruise much modernized with digital control with a stepper motor. I am just not fond of the electric - vacuum GM setup, but I have to admit it is ingenious. You have to use a sending unit connected to the speedometer connection, or perhaps you can get information from your present injection setup.
One thing I was wondering about and that's how your switch pitch transmission was doing. Secondly, note that Manny Travao recommends synthetic fluid for the transmission with the switch pitch feature as they tend to run hotter in some conditions.
Best,
Carey
The switch pitch tranny seems to be operating fine, I use the toggle to split gears if needed and the pushbutton to get the R's up when pulling a hill. Never saw over 160 on the trans temp gauge.
This was our first time out with the coach though.
I can't tell you what type of fluid may be in the tranny but I can tell you it is bright red with no burnt smell at all.
As for the cruise control I did look at a link for upgrading with newer stuff from the wrecking yard,.... may eventually go that route but will go through the steps to see if I can make this system functional. A little less work and money.
Don't get me wrong, I will spend the money when necessary as I spared no expense replacing the brakes and having my steering gear rebuilt. I did decide to go with an off brand tire but so far I love them, more because we won't be putting a lot of miles on this coach before they will be aged out, they are load range E though and they are quiet. They have really good reviews as well. The only thing that was making noise going down the road was the roof air which I am in the process of securing 3-4 cans of R-12 to bring my dash system to full charge.
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
|
|
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257902 is a reply to message #257901] |
Tue, 05 August 2014 18:27 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
|
Senior Member |
|
|
A Hamilto wrote on Tue, 05 August 2014 16:17lotsofspareparts wrote on Tue, 05 August 2014 17:53...The only thing that was making noise going down the road was the roof air which I am in the process of securing 3-4 cans of R-12 to bring my dash system to full charge.
Jared Even the newest iteration of the GMC motorhome dash air will not cool much more than the cockpit on a really warm day. If you do not have any passengers behind the cockpit, rig up a curtain behind the cockpit seats to hold more cool air in the cockpit. If you have passengers seated behind the cockpit, rig a curtain to contain the smallest area necessary to include them with the cockpit air. Note the curtain has to cover from floor to ceiling and driver's side wall to passenger side wall. The more air gets past it from the cockpit to the "house", the less chance that it will work.
If a PO has augmented the factory insulation in ceiling and walls, the dash air will cool the living space better than original, but still won't do it all on a hot day.
We actually do have a full curtain between the cockpit and coach, figured it was factory since it matches all of the window curtains and the privacy curtain that covers the windshield.
Who can tell me where the CC fuse is located?
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
|
|
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257910 is a reply to message #257903] |
Tue, 05 August 2014 19:51 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
|
Senior Member |
|
|
A Hamilto wrote on Tue, 05 August 2014 16:39lotsofspareparts wrote on Tue, 05 August 2014 18:27...Who can tell me where the CC fuse is located?
Jared Maintenance Manual X7525 Page 12-6. Then ref Page 12-7, Figure 10.
You have downloaded the Maintenance Manual haven't you?
I have the GMCMH USB Swiss Army Knife that Bill sells, I also have the paper manuals as follows X-7525, X-7725, 78Z, X-7721A. I also have the GMCMHI Newsletters going back to Vol 1 #4 Summer 1983 up to Fall 1993.
I will look up the location of the fuse, just didn't see it labeled in the fuse block or it's location in the wiring diagram.
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
|
|
|
|
| Re: Trouble Shooting Cruise Control [message #257914 is a reply to message #257810] |
Tue, 05 August 2014 20:35 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
|
Senior Member |
|
|
Wow, it is actually labeled in the fuse block.
Says "Cruise" on the left side, and "Back Up Lts" on the right side.
Guess what......
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
|
|
|
|
Goto Forum:
Current Time: Fri Sep 27 12:24:19 CDT 2024
Total time taken to generate the page: 0.01183 seconds
|
GMCforum
Search
Help
Register
Login
Home
