Engine/Transmission (1994 - 1998) cruise control

[sargef]

I got a 1997, the cruise control will speed up when come out hills,or set it. And it won't come back to the set speed for about mile. can anyone tell how fix it. Sargef

 

[Joe G.]

The first thing to check for any cruise control problem is the vacuum line. The servo is under the driver's side battery. The battery may leak acid on the little plastic vacuum pipe and make a hole in it. Also check the pull cable to the throttle linkage. It may be sticking. Also lube the ball ends of the throttle rod from the linkage to the injection pump lever. Make sure that there is no disconnection in the vacuum lines anywhere on the truck. If it's still doing it check your vacuum with a gauge.

 

[HFreeman]

The following TSB may address the problem. TSB 08-16-95A. Speed control - over/undershoot during set of speed selection.

The bulletin discusses the “adaptive strategy” that compensates for vehicle-to-vehicle variations in speed control cable lengths. Pressing the “set” button without pressure on the accelerator pedal can cause speed fluctuations. Proper review of the condition with vehicle operator is recommended. The cruise control will develope a " memory". The solution is to set the control with pressure on the accelerator for approx. 10 times. This will clear the memory. I hope this helps.



Hank

 

[TEasley]

One more time--THIS IS THE BEST $35 I EVER SPENT !



Tom

 

[JoeBioDiesel]

If the suggestions in the service bulletin don't work, you will probably end up needing a new cruise control servo. If it does it worse when it's cold, it's probably the servo.

Good luck,

Joe