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  #1  
Old 01-05-2003, 02:59 PM
mark300cd
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cruise control problems

i am having cruise control problems with my 84' 300cd. sometimes it works, but usually it doesn't. when i move the lever upward to set/accelerate it will accelerate the car but when i release the lever the cruise control does not engage.
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  #2  
Old 01-05-2003, 04:29 PM
engatwork's Avatar
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Join Date: May 2000
Location: Soperton, Ga. USA
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Mark,
Do a search on here on cruise control - your problem sounds pretty typical. More than likely the amplifier.
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  #3  
Old 01-05-2003, 07:15 PM
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Location: Noblesville, IN
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Your symptoms sound exactly like those on my 300cd. Replaced the amplifier and it works great.
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  #4  
Old 01-05-2003, 08:30 PM
MVK MVK is offline
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Blocking the air recirculation valve on the turbo units have helped me get rid of the surges on my 300D turbo 1985. But I would like clear the fact that i did not have any problems with setting or engaging the cruise control. It was the surges that were driving me insane.

MVK
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1985 300D Turbo 179,000miles

Last edited by MVK; 01-06-2003 at 01:02 AM.
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  #5  
Old 01-06-2003, 12:39 AM
mark300cd
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where is the amplifier located and how difficult is it to replace. i am mechanically inclined but the car is new to me. thanks for all the help
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  #6  
Old 01-06-2003, 02:10 AM
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first think I always check, make sure you have german bulbs in the tail lights meaning they better have a silver bottom. Copper and brass, throw them away.

Then go from there.
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No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
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  #7  
Old 01-06-2003, 02:48 AM
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Re: bulbs....http://www.gdl-online.com/bulb.html


Good Cruise reference:...http://www.gdl-online.com/begin1.html#contents
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1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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  #8  
Old 01-06-2003, 02:58 AM
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the resistance of the bases are different.

Well when I change the bulbs to german ones it always works. You can read about it or do it. the choice is yours.
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No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
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  #9  
Old 01-06-2003, 09:11 AM
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Join Date: Oct 2002
Location: Noblesville, IN
Posts: 178
On my '81 300CD the amplifier is above the steering column near the firewall. It is silver in color and appr. 4" x 1" x 5". It is easiest to remove the "strap" from the car and then the strap from the amplifier. There is a ten wire connector attaching to the system. Yous may have more or fewer wires going to and from the amplifier.

The bulbs will affect the cruise control only when interupting when you brake. It is necessary to have European bulbs in the brake lights. They are available at the McParts stores.

I hope this is of some help. I have tried to be accurate in description, but it's been awhile since I've worked on this.
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