89 suburban cruise control problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

old man jimmy · 08-05-2007, 03:31 AM

anyone found the answer to this problem with cruise? Works fine cold for a few miles, then kicks off. Colder it is longer it stays on. And when it's starting to warm up, will work uphill but when it lets up downhill, it won't kick in again. Sometimes you can push the pedal down & will catch. Have replaced cruise control modual, and turn signal lever(with the switches) still the same thing. Must have a speed sensor of sorts somewhere, but don't know where or what it even looks like. Speedo cable goes from speedo to trans one piece.

BLE 'BURBAN · 08-06-2007, 04:15 AM

Have you checked your vacuum lins for possible leaks?
Since your Speedo is the old school cable driven style, you may want to check the back of the speedo itself and see if there is what looks like a couple of wires held in place with a retaining screw. If it's there then that is the "HALL EFFECT" pick up for the cruise control.

gchemist · 08-06-2007, 06:20 PM

http://elcaminocentral.com/article107.html

I ditched the factory setup for a www.rostra.com. Worth every penny.

old man jimmy · 08-07-2007, 04:31 AM

Ok Burban, at the risk of sounding stupid. What is the "Hall Effect?" Only guessing, sounds like the dilly whap to measure the speed. And have replaces all vacuum lines. Sill no change. Their's a vacuum diapham thingy on the firewall with rod to TB. But haven't replaced it. Can't find one. And checked the rostra.com site. They don't go back to 89. Will check for the wires behind speedo. Thanks guys.

08-05-2007, 03:31 AM	#1
old man jimmy Registered User Join Date: May 2007 Location: texas Posts: 329	89 suburban cruise control problem anyone found the answer to this problem with cruise? Works fine cold for a few miles, then kicks off. Colder it is longer it stays on. And when it's starting to warm up, will work uphill but when it lets up downhill, it won't kick in again. Sometimes you can push the pedal down & will catch. Have replaced cruise control modual, and turn signal lever(with the switches) still the same thing. Must have a speed sensor of sorts somewhere, but don't know where or what it even looks like. Speedo cable goes from speedo to trans one piece.

08-06-2007, 04:15 AM	#2
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: 89 suburban cruise control problem Have you checked your vacuum lins for possible leaks? Since your Speedo is the old school cable driven style, you may want to check the back of the speedo itself and see if there is what looks like a couple of wires held in place with a retaining screw. If it's there then that is the "HALL EFFECT" pick up for the cruise control.

08-06-2007, 06:20 PM	#3
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: 89 suburban cruise control problem http://elcaminocentral.com/article107.html I ditched the factory setup for a www.rostra.com. Worth every penny. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

08-07-2007, 04:31 AM	#4
old man jimmy Registered User Join Date: May 2007 Location: texas Posts: 329	Re: 89 suburban cruise control problem Ok Burban, at the risk of sounding stupid. What is the "Hall Effect?" Only guessing, sounds like the dilly whap to measure the speed. And have replaces all vacuum lines. Sill no change. Their's a vacuum diapham thingy on the firewall with rod to TB. But haven't replaced it. Can't find one. And checked the rostra.com site. They don't go back to 89. Will check for the wires behind speedo. Thanks guys.



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