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  #1  
Old 11-07-2010, 12:28 PM
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Location: Hanahan, SC
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Intermittent Cruise Control

The CC on my 84 300D turbo works sometimes but not always. It seems as if I turn it on at about 25 MPH or 40km it works well. However at higher speeds it will not cut in> Where is the first place to look?Has any one else experienced this? All replies greatly appreciated.

Thanks,
Harry
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  #2  
Old 11-07-2010, 02:39 PM
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Not sure of how the exact system in your car. My 1996 E320 had issues with tire size, and as you say at low speeds it was fine.

Or I hear vaccuum leaks can cause issues ?
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  #3  
Old 11-07-2010, 05:44 PM
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Most cruise issues are caused by the cruise amp. resoldering the connections will often set thins right for a while. A small percentage are caused by a bad actuator.
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  #4  
Old 11-07-2010, 06:02 PM
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I read to re-solder just the capacitors. Two are round, the rest are rectangular. If that fails, re-solder again and then do the rest.

But there is a varnish over the board making it very hard to work on.

And to remove the board I read about bending the small metal tabs that bend towards the center. Once bent outwards the board will pull right down. Otherwise its a pain to remove the board and metal housing.

A search will bring many tips on how to repair it.
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  #5  
Old 11-08-2010, 07:27 AM
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intermittent cruise control

Thanks,

I am a novice so I need to know where the amp is located and how to pull it out.

Thanks again,
Harry
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  #6  
Old 11-08-2010, 09:28 AM
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Its under the drivers side kick panel just to the left of the steering column. Look for a VHS tape (remember those?) size silver relay. Unplug it, then struggle for hours trying to get the ONE phillips head screw out to pull the amp. GOOD LUCK
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  #7  
Old 11-08-2010, 09:44 AM
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intermittent cruise control

Thanks..but if its that hard ill probably leave it to my mechanic. Does anyone know the prox cost of a new amp? I may try it anyway.

Thanks,
Harry
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  #8  
Old 11-08-2010, 02:57 PM
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New amp? A few hundred. Rebuilds I think run $200.

And no, you do not have to struggle for hours if you just bend the tabs back that hold it. I think four. Then it slides right down! Makes it REALLY easy to take out, solder and test.
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