What would cause my cruise control to 'surge' please take a look....

[unpredictable1]

I have a 93 Eddie Bauer, auto tranny.

I find if I set my cruise to 100-120 my Xplorer surges to stay at the speed.

What I mean is that, instead of a smoothsteady speed its like the thing is giving the throttle small, small shots of gas. its minor but i notice and i find it very annoying. but i'm also very meticulous over my vehicles

any ideas? she has 163 k kilometers on the odometer (about 98k miles??)

Thanks guys,

Leo

 

[JDraper]

Could be a vacuum leak in the cruise control module. Had that happen with my old Monte Carlo. The diaphragm that held vacuum to hold a constant speed had a pin hole in it. Caused the cruise to surge.

 

[unpredictable1]

awesome, thanks for the help.

think you could point me to where this cruise control module/unit is located under the hood?

thanks

leo

 

[MrShorty]

on my '92, it's on the drivers side mounted on the wheel well in front of the brake master cylinder. it will have a vacuum hose running to the vacuum tree and a cable running to the throttle body parallel to the main throttle cable.

 

[Byrd91]

My cruise control surges because of my speedometer being jumpy. If you've ever noticed it jumping around that could be it. I tried greasing mine but it didn't help. So I just live with a bouncy speedo, and no cruise control.

 

[VairKing]

Mine was doing the exact same thing a couple weeks ago, right after I washed the engine. I posted here, and someone said to check the vaccum line or something, but the next time I got in it and drove it, it worked fine. I think maybe I got something wet...Who knows....

 

[5.0Dad]

Does it surge whether it's in 3rd or 4th? I have a coworker who's 96 started doing the same thing and it got progressively worse. Turned out that was the first sign that his tranny was slipping and he ended up with a rebuild. I hope the CC fix is all you need.

 

[unpredictable1]

well once i get the A/C straightened away I'll get it looked at.

My speedo sometimes is bouncey yes but, i can be on a perfectly flat and smooth stretch of road and she still does it.

i know my warranty covers powertrain....but i aint taking it to the crooks that are called ford here to replace it (third party warranty)

 

[SWLathrop]

We use a 93 Ranger with the 4.0 OHV in it for a parts truck at the ford dealership. It was doing the same thing. Set the cruise and you get a constant vroom, vroom, vroom.... and on and on. After replacing the IAC, the problem had gone away. Ranger had about 102,000 miles on it when the problem started.

 

[RebelYell]

:redexp: Ditto on what 5.0Dad said - my 96' started surging at highway speed (65-75) about a month ago (109,000 miles). The CIL and O/D On/Off lights were both acting wacky. And a tranny solenoid code was showing on the 'puter. Turns out the OD ring was worn out. It's in the shop right now having the tranny rebuilt. :fire:.

Check it out closely!