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#1
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'84 300sd Why is my cruise control disconnected
Hi folks,
When I bought my '84 300sd a few months ago, I noticed that the rod connecting the cruise control actuator to the "throttle" linkage was missing. Any ideas why? I presume the cruise control must have a problem that makes it dangerous to use. Thanks
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Jack 1984 300SD. 115k miles. |
#2
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I've never met anyone with a working cruise control on the older models. A lot of them had problems right from the beginning. It's likely that yours doesn't work and like you said may have been causing odd issues that could cause safety concerns. I personally wouldn't bother messing with it. But others might say otherwise.
Most of the issues are in the cruise amp under the dash. Sometimes all they need is all the contacts to be re-soldered.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#3
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Mine was disconnected too, I have heard stories of the cruise control sticking and causing a dangerous situation, so I dont intend on trying to fix it.
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#4
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Hmm. I have a 12 hour drive to make this spring, and I'm not too keen on the idea of using my foot the whole way. Does anyone know anything about diagnosing the system? Is it worth it to open up the amp and resolder the connections, hook up the cruise control actuator and give it of shot?
Thanks
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Jack 1984 300SD. 115k miles. |
#5
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Usually, they can be repaired fairly easily but here's the glitch....if you try to do any resoldering,etc.. the repair facilities won't touch them. The best route is to send the amp to either of these places, for a little over $100 and be done with it:
ProgRama 003 545 86 32 Mercedes Benz Cruise Control General Development Laboratories - Table of Contents Both websites have troubleshooting suggestions they recommend. As mentioned earlier, it is most likely the amp but it is best to verify nothing is wrong with the servo as well. If funds are severely limited, there is information available but keep in mind what I mentioned earlier.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#6
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GDL is your best bet. But an amp rebuild will cost considerably more than $100. A Programa rebuilt unit is cheaper, but arguably not as good. Actuator with that kind of low mileage is probably OK....but no guarantee.
Ideal approach is to send both actuator AND amp to GDL for evaluation and take it from there.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#7
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Wow! I just went to the pricing page for GDL and they have gone up significantly! The last I recall was about $139.
Sorry for the misleading pricing info!
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#8
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Thanks for the info, folks. One other detail: when i try to engage the cruise control with the steering column stalk, I don't get any light on the dash. Does this indicate anything further? I am going to test the resistance on the amp, as the Programa website suggests.
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Jack 1984 300SD. 115k miles. |
#9
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Quote:
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#10
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74baja, to my knowledge, not even the later 126's had a CC indicator light. So I doubt your '84 SD has one.
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Never be ashamed to ask for help. 1985 300D 1987 300SDL 1970 Jaguar E-Type OTS 2002 Dodge Intrepid (Traded In) 2011 Ford Crown Victoria |
#11
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Ah, alright. That explains it. Thanks.
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Jack 1984 300SD. 115k miles. |
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