Cruise control surging?
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Junior User
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Cruise control surging?
So my cruise control is "surging" ikn my 88 f250. I put it in quotes because its more so that when I activate it, it goes full throttle then no throttle back forth constantly. I can't seem to figure out the issue. My boss (I work at a ford dealer but don't have the old literature to look at) suspects the servo but I don't see that being an issue since it can go full throttle no issue. I was thinking maybe the vss in the diff but I'm not sure if that is what the cruise control runs off of. Does anyone have the diagram for the cruise control system?
Senior User
Joined: Dec 2010
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From: Shafer, MN
VSS is a good place to start because if I remember right thats what feeds the ecm speed info as well as the odometer.
I could also see the servo, but honestly that truck is old, so it would be cheap enough to just pull one from a junk truck and try swapping it.
I could also see the servo, but honestly that truck is old, so it would be cheap enough to just pull one from a junk truck and try swapping it.
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Junior User
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Well I know it doesn't feed the speedo because it is cable driven on the 88. I was pretty sure it fed the ecm and I know it feeds the abs. I do get intermittent abs light but it never comes on at a convenient time to read the code. I guess I'll replace it and see if it does anything
Fleet Owner
Joined: Oct 2005
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From: Kentucky
The rear differential sensor is for the RABS system only. There is a VSS inline with the speedometer cable to feed the computer and the Speed Control servo. On 4wd vehicles I believe this is located on the transfer case.
Steve83 has some great info here: 1983 Ford Bronco 90-25-12 Vacuum Cruise pictures, videos, and sounds | SuperMotors.net
Steve83 has some great info here: 1983 Ford Bronco 90-25-12 Vacuum Cruise pictures, videos, and sounds | SuperMotors.net
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Junior User
Joined: Feb 2017
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The rear differential sensor is for the RABS system only. There is a VSS inline with the speedometer cable to feed the computer and the Speed Control servo. On 4wd vehicles I believe this is located on the transfer case.
Steve83 has some great info here: 1983 Ford Bronco 90-25-12 Vacuum Cruise pictures, videos, and sounds | SuperMotors.net
Steve83 has some great info here: 1983 Ford Bronco 90-25-12 Vacuum Cruise pictures, videos, and sounds | SuperMotors.net
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