Cruise control gathering speed

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Jan 2, 2013 | 10:34 PM

#16

Lorenfb

Race Car

Joined: May 2003

Posts: 4,248

Likes: 103

From: SoCal

"Where would one send it for repair?"

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Jan 3, 2013 | 11:51 AM

#17

wwest

Drifting

Joined: Sep 2001

Posts: 2,467

Likes: 16

From: redmond wa

Quote:

Originally Posted by bhtaco21

86 coupe. Cruise control goes to WOT when the stalk is pressed up or down. So in the "set" position, it goes to WOT. And in the "resume" position, it also goes to WOT. Seems like CC ECU needs to be repaired or replaced?? Where would one send it for repair?
Thanks
Butch

WOT in those instances would seemingly indicate a lack of road speed input.

CC must be "tapped" into the speedo signal or maybe even the tach signal since using the clutch (or brake) always disables the CC.

And..if the a vacuum loss were serious enough to adversely impact the operation of the CC it wouldn't "take", lock on, the speed setpoint to begin with.

Older CC systems most likely used good grade capacitor in a "sample-and-hold" circuit to control the servomotor. install a low grade, "leaky' capacitor in the circuit and the resulting "leakdown" would cause a decline in the speed control setpoint over time.

Not sure why a CC would "gather" speed but likely some sort of positive current leakage (dust/dirt + moisture?) into that self-same capacitor.