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Old 02-26-2013, 08:25 PM   #1 (permalink)
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Default Cruise control problem

05 Subaru Outback wagon 2.5 liter Turbocharged. When my cruise control is on it surges up and down. This only happens on level road or downhill. It does maintain the speeds that I set it on while it surges. I also had cruise control light flash twice on me. When this happens is shut down the cruise control and I have to restart the car to get it to work again. Feedback would be greatly appreciated
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Old 02-26-2013, 08:29 PM   #2 (permalink)
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No MIL light?

What condition is the throttle body and butterfly plate in? Dirty? Loaded with carbon?
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Old 02-27-2013, 01:59 PM   #3 (permalink)
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No lights come on... I have no problems with the cruise control off it excelerate smoothly on the road. I would think if the throttle body was sticking I would have problems all the time
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Old 02-27-2013, 02:54 PM   #4 (permalink)
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Were any of the wheel bearing hubs changed before the problem appeared?
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Old 02-27-2013, 04:04 PM   #5 (permalink)
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Yes, I replaced both wheel bearings. The first one I did last summer about the time this problem started. They are aftermarket parts
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Old 02-27-2013, 04:45 PM   #6 (permalink)
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Quote:
Originally Posted by piledriver View Post
yes, i replaced both wheel bearings. The first one i did last summer about the time this problem started. They are aftermarket parts
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Old 02-27-2013, 06:25 PM   #7 (permalink)
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The cruise control depends in part on the ABS wheel speed sensor signals. On the MY05+, each wheel has a Hall (magnetic) sensor fixed to the steering knuckle. On the back of each hub there's a magnetic strip. As the hub turns, the sensor picks up the signals from the magnetic strip on the hub and sends it to the ABS module.

The magnetic strip has to be made properly, and the hub fit precisely in position so that the sensor will accurately pick up the signal. There have been cases reported here where aftermarket replacement hubs have had problems -- the cruise control malfunctions. It could be poor construction or design of the aftermarkets, but to be fair, it should also be noted that the magnetic strip can be easily damaged if magnetized tools are brought close to it during the installation, or if the hub is banged/dropped/heated, which can remove some of the magnetism.

Also, the sensor can be easily damaged, and if it was removed to replace the hub, it has to be replaced in the same location. Distance from the magnetic strip at the back of the hub is important.
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Old 02-27-2013, 06:40 PM   #8 (permalink)
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Nice catch Plain OM.

Quote:
Originally Posted by piledriver View Post
Yes, I replaced both wheel bearings. The first one I did last summer about the time this problem started. They are aftermarket parts
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Old 05-07-2013, 12:14 PM   #9 (permalink)
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so if this is the scenario on my car (sounds exactly like it) as I had the rear bearings replaced a while back, what can I do to remedy?

I'm going to be replacing the front passenger myself soon, is there anything I can check/alter/replace on the rears?
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Old 05-07-2013, 01:18 PM   #10 (permalink)
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Unfortunately, piledriver hasn't updated the thread as of this time and we don't know with any certainty if the hub change was the cause. If it is a hub causing the unstable cruise control operation (and not, for example, a defective or improperly positioned ABS weheel sensor), then the only remedy is probably to replace the hub, again.
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