cruise control adjustment? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

franko72 · 12-02-2004, 07:26 PM

the cruise control on my 72 seems to be eratic to keep a steady speed.It kicks down and lets off of the gas pretty hard.I dont have to use the gas pedal and it functionally works ,but not as smooth as a newer vehicle.are there any adjustments that can be done?

chipflyer · 12-02-2004, 09:31 PM

About the only adjustmant (which probably won't help you) that can be made is to the fitting with the jam nut on the transducer, its the fitting with the vacuum hose on it. That adjustment only affects the set speed, meaning if you set it at 60mph and it cruises at 58 you turn the fitting out a 1/2 turn per mph until it cruises where you set it. You may want to check your throttle spring, if its been replaced with a heavier than normal spring (which happens alot) it will make the cruise system work harder to overcome spring tension.
I have cruise in my 71 and it sure is sweet to go down the road at 65mph while tapping my RIGHT foot to the beat of AM talk radio! :p

Longhorn Man · 12-02-2004, 10:15 PM

Hmmm, I'll have to locate all my cruise control info, (may take a few days, I think it's at *her* house) But if memory serves, you need to tighten the chain going to the throttle rod.

Longhorn Man · 12-02-2004, 10:16 PM

Oh, wait a min, you have a 72, it would be the chain coming from the large vacume deal that tigs on the throttle. Not really surw how it is done up on a 72.

chipflyer · 12-02-2004, 10:44 PM

Yes, they cable may need adjustment, just take all of the slop out of the cable with the engine shut off by adjusting at the servo bracket as seen below. I had to stiff a spring on mine for awhile and had the same problem you are having.

Longhorn Man · 12-02-2004, 10:45 PM

Good, I didn't really what to go to *her* house.

franko72 · 12-07-2004, 10:33 PM

thanks for the info!

12-02-2004, 07:26 PM	#1
franko72 Franko72 Join Date: May 2004 Location: Cincinnati,Ohio Posts: 471	cruise control adjustment? the cruise control on my 72 seems to be eratic to keep a steady speed.It kicks down and lets off of the gas pretty hard.I dont have to use the gas pedal and it functionally works ,but not as smooth as a newer vehicle.are there any adjustments that can be done? __________________ 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust

12-02-2004, 09:31 PM	#2
chipflyer Registered User Join Date: May 2004 Location: Topeka, Ks Posts: 2,293	About the only adjustmant (which probably won't help you) that can be made is to the fitting with the jam nut on the transducer, its the fitting with the vacuum hose on it. That adjustment only affects the set speed, meaning if you set it at 60mph and it cruises at 58 you turn the fitting out a 1/2 turn per mph until it cruises where you set it. You may want to check your throttle spring, if its been replaced with a heavier than normal spring (which happens alot) it will make the cruise system work harder to overcome spring tension. I have cruise in my 71 and it sure is sweet to go down the road at 65mph while tapping my RIGHT foot to the beat of AM talk radio! :p __________________ I'm not a pessimist, I'm just optimistic that bad things are going to happen. 1971 Cheyenne Super K10 - tilt, cruise, air, am/fm, tow hooks, factory buckets! 1986 Jeep J10 pickup, - 5.3L Vortec with 4L60e and NP241.

12-02-2004, 10:44 PM	#5
chipflyer Registered User Join Date: May 2004 Location: Topeka, Ks Posts: 2,293	Yes, they cable may need adjustment, just take all of the slop out of the cable with the engine shut off by adjusting at the servo bracket as seen below. I had to stiff a spring on mine for awhile and had the same problem you are having. __________________ I'm not a pessimist, I'm just optimistic that bad things are going to happen. 1971 Cheyenne Super K10 - tilt, cruise, air, am/fm, tow hooks, factory buckets! 1986 Jeep J10 pickup, - 5.3L Vortec with 4L60e and NP241.

12-07-2004, 10:33 PM	#7
franko72 Franko72 Join Date: May 2004 Location: Cincinnati,Ohio Posts: 471	thanks for the info! __________________ 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust

12-02-2004, 10:15 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Hmmm, I'll have to locate all my cruise control info, (may take a few days, I think it's at her house) But if memory serves, you need to tighten the chain going to the throttle rod.

12-02-2004, 10:16 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Oh, wait a min, you have a 72, it would be the chain coming from the large vacume deal that tigs on the throttle. Not really surw how it is done up on a 72.

12-02-2004, 10:45 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Good, I didn't really what to go to her house.



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