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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
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Old 01-12-2009, 09:36 PM   #1 (permalink)
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cruise control not working

My '97 Auto. hasn't had cruise since I bought it 3 yrs. ago, anyone got a good idea how this would happen?

I'm guessing wiring, I haven't looked at a schematic yet...nor have access to one at this time.

The light on the steering wheel does appear when I turn it on. However once I go to set it..it does not set.

Anyones ideas would be greatly appreciated.

Thanks.
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Old 01-12-2009, 09:42 PM   #2 (permalink)
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I have the exact same problem with my 98. The light comes on and it will not let me set any speed.
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Old 01-12-2009, 11:06 PM   #3 (permalink)
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i highly doubt that it is a wiring issue...its a vacuum line leak... go through all your vacuum lines starting from the vacuum pump and check for loose connections and leaks..i would replace all those flimsy rubber fittings they use to join the plastic hard tubing with the appropriate gauge rubber tubing so everything is tight and you can be sure there aren't any leaks. and usually the culprit is where the vacuum line goes into the firewall right above the turbo..it either gets melted or loose and then you lose cruise, but if you can move the plastic vacuum hard lines freely from their rubber fittings, get like a 2 foot section of rubber hose and cut new pieces to join them together...and eliminate any leaks and then go from there if your issue is still present...you may not even have like panel or floor vents...this is the exact same problem
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Old 01-13-2009, 08:05 AM   #4 (permalink)
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Hey.. I got no cruise control, and no defroster in my 97.. Got vents, and floor air, and they both move, but it won't go to defroster. The heater controls are vacuum operated on these rigs?

Thanks,
Len
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Old 01-13-2009, 02:52 PM   #5 (permalink)
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Try lifting up on the brake pedal while setting the cruise.
The brake light switch is cheap and prone to failure.
If it cures your cruise problem by lifting a new switch is about $13 at Napa.
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Old 01-13-2009, 03:41 PM   #6 (permalink)
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I had no cruise and the controls for defrost, etc were not working also. Come to find out when I was changing my fuel filter I cracked the plastic vaccum tee by the top of the valve cover close to the firewall. I think it's a 1/4 tee... There is a line that goes to the VSS(vehical speed sensor) below the drivers side battery near the fender, that was broken. After replaceing the tee and replaced the plastic line with rubber...down to the sensor, in the drivers fender, everything started to work. Check your vac lines for cracks...and replace with rubber.
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Old 01-13-2009, 05:13 PM   #7 (permalink)
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I will go and check everything out this afternoon. Thanks for the help
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Old 01-13-2009, 10:30 PM   #8 (permalink)
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i have cruise, but it acts funny. i can set it on flat road and it does okay, but if i set it going up hill, or down hill it will speed up, sometimes as much as 8 or 9 mph, and then slowly come back down to where i set it. and the strangest thing of all is it's worse when it's cold. i use it some in the summer, but almost never in the winter.
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Old 01-14-2009, 01:29 PM   #9 (permalink)
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Quote:
Originally Posted by familymechanic View Post
i have cruise, but it acts funny. i can set it on flat road and it does okay, but if i set it going up hill, or down hill it will speed up, sometimes as much as 8 or 9 mph, and then slowly come back down to where i set it. and the strangest thing of all is it's worse when it's cold. i use it some in the summer, but almost never in the winter.
Sounds like the cable from the cruise actuator under the battery is gunked up or half eaten by battery acid.
Check the cable in it's entirety for binding.
For sure the most common cruise control problems are caused by battery acid.
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Old 01-16-2009, 01:15 AM   #10 (permalink)
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i have the same problem with my 98 too...i turn it on and the light turns on but i cant set it at the speed i want but im going to check my vacumm lines maybe thats it but thanks for the help guys
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Old 01-16-2009, 06:54 PM   #11 (permalink)
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I had it happen too. I was convinced it was electrical as i checked the vaccuum line at the T on the firewall. after hooking a scan tool to it (the benifits of having a 98) it turned out to be a huge hole in the tubing from the T to the VSS
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