Cruise Control problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Russell · 10-19-2004, 09:57 AM

Hey fellas

What could gause your cruise system to floor the truck until you hit the brake to stop it rather than maintaining it's speed?

DennyB · 10-19-2004, 11:26 AM

I have seen sticking set/acc buttons on the steering wheel cause this.
What truck and system is this?

Russell · 10-19-2004, 07:03 PM

80 GMC, got the little box on the fender. I'm trying to get the setup working so I can box it up and ship it down to a guy who wants it as a working system. I think I have another set / acc button, so I'll give it a shot...

apstguy · 10-19-2004, 07:24 PM

It could also be the vss (vehicle speed sensor) if it is disconnected it could cause the truck to accelerate indefinitly.

Russell · 10-19-2004, 07:27 PM

The vss is that box on the fender right? I suspected it is the problem... I'll run to the yard and get a new one, see if it helps

apstguy · 10-19-2004, 07:33 PM

It should be in the speedo w/ a little green box attatched. - 87 is on the tranny I believe. Earlier ones might have it in the fender. It would be sonnected to the speedo cable somewhere.

Russell · 10-19-2004, 08:01 PM

Yep, my truck has both installed now, but didn't come factory with the VSS in the dash. I needed one for my EFI setup, so I put a later speedometer in with the electronic VSS

DrMaserati · 10-20-2004, 06:53 PM

Quote:

Originally Posted by apstguy

It could also be the vss (vehicle speed sensor) if it is disconnected it could cause the truck to accelerate indefinitly.

No. 1980 was before the days of VSS. The cruise is controlled completely by the transducer mounted on the left inner fender. That unit controls vacuum to a diaphragm that actuates the throttle linkage. This is before the days of electronic control.

JP

10-19-2004, 09:57 AM	#1
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Cruise Control problem Hey fellas What could gause your cruise system to floor the truck until you hit the brake to stop it rather than maintaining it's speed? __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

10-19-2004, 11:26 AM	#2
DennyB Led Sled! Discs R 4 ME! Join Date: Jan 2001 Location: Toms River, NJ, USA (Transplanted Hoosier) Posts: 7,327	I have seen sticking set/acc buttons on the steering wheel cause this. What truck and system is this? __________________ "Never ride faster than your Angel can fly" I.M.O.M,W,J&C Patriot Guard Rider

10-19-2004, 07:03 PM	#3
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	80 GMC, got the little box on the fender. I'm trying to get the setup working so I can box it up and ship it down to a guy who wants it as a working system. I think I have another set / acc button, so I'll give it a shot... __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

10-19-2004, 07:24 PM	#4
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	It could also be the vss (vehicle speed sensor) if it is disconnected it could cause the truck to accelerate indefinitly. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

10-19-2004, 07:27 PM	#5
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	The vss is that box on the fender right? I suspected it is the problem... I'll run to the yard and get a new one, see if it helps __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

10-19-2004, 07:33 PM	#6
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	It should be in the speedo w/ a little green box attatched. - 87 is on the tranny I believe. Earlier ones might have it in the fender. It would be sonnected to the speedo cable somewhere. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

10-19-2004, 08:01 PM	#7
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Yep, my truck has both installed now, but didn't come factory with the VSS in the dash. I needed one for my EFI setup, so I put a later speedometer in with the electronic VSS __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)



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