Cruise control problem

[BobbySmith]

I have a problem with the cruise control on my '97 Dodge 5 speed. When the cruise control is initially set on the highway, it will set and then very gradually start increasing the speed. I don't know when, if ever, the increase in speed will stop. I don't intentionally let it increase very much, but I have seen 10-15 MPH increase, before I shut it off. After setting the cruise control and switching it off between 5 & 10 times, it will set and work perfectly for the duration of the trip, or until the engine is shut off again. I have done vaccum test and the system will hold a constant 27 inches. The servo hoses etc. under the driver side battery shows no obvious problem. I am aware of the undershoot/overshoot problem and have performed the "relearning" exercise many times but it has not helped. Any Ideas? Anyone had a similar problem?

 

[PToombs]

Hi Bobby! Welcome to the website! I don't know much about cruise stuff. You may get a better response if you post this in the 2nd gen forum. Losta differences from 1st gen to 2nd.

 

[boatpuller]

I'm not sure what the differences are in the cruise from 1st to 2nd gens but my first gen does the same thing yours does, it's fine until it goes up a hill and gives more throttle, then it just keeps giving it throttle. If you figure out what it is please let us know on this post, from the searching I've done most people think that the problem is in the PCM.

 

[dpuckett]

Mine surges, too. I gained 20mph after topping a hill, and havent used it since. But, my speedo isnt rock steady, so I think the two may be related (speedo reading drops, so it gives more fuel to get you back to set speed).



Daniel

 

[Paychk]

One of these may help:

TSB 08-10-91
TSB 08-07-93 Rev. A
TSB 08-09-93
TSB 08-12-90
TSB 18-05-92