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i have a chance here today seeing a 81' 380 SLC selling, and i really want to get it since it's very special year to me. The owner told me that it was running, but not now anymore. to start the car, i needed to press some gas to start the engine. after the engine started, i keeps rev and rev, the engine sounds very sexy and good. but matter is, it turns off itself at idle time, it goes out under 1000rpm. and that's why the owner is selling is car.<br><br>
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so guys, any thoughts of what's broken?<br><br>
also, the price to fix that?<br><br>
<br><br>
Carlsson<br><br>
Toronto, Canada.<br><br>
SL-500 AMGed
 

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Hello !<br> A have a 1978 450 SLC, and I has the same problem.<br> I changed the Gas pressure accumulator below the gas tank and changed one of the eight injection tubes obstructed, located below of air filter.<br> Try to explain this to the owner or any mercedes benz thecnical mechanic specialist.<br> I am from Brazil and the cost is dificult to talk, because here, all the parts are imported whith a very large tax !!<br> Anything more, talk to me and I will try to help you if I can !<br> All the SLC models, are one of the most spetacular vehicle produced by Mercedes !!<br> I am sorry about my poor english !!<br> Bye<br> Marcos WC<br>
 

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Idle on the 380 is controlled by a black box dedicated to the job. This may be failing. The usual fault is too high an idle, so I can't be sure. Last time I bought one is was about 100 pounds (US$150).
 

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$100 to $6000

It could be a lot of things. If it is in bad tune, it may just need plugs, rotor cap and such. Could go all the way to fuel injectors. Most likely it is the idle speed control module and Air slide valve. No time to check the manual on your year, do you have an electric idle speed control and air slide valve? I had a similar problem and replaced: Over Voltage Protection Relay, Fuel Pump Relay, Idle Speed Control Module, Air Slide Valve, Plugs, Rotor and Cap, a couple plug wire ends and finally found it to be the Ignition Control Unit. You don’t want to know how long it took me. It didn’t cost too much because I bought rebuilt and discount parts but it was out of service for way too long. Now that I know a little about the system I could do it much faster. Do you have any other symptoms? My RPMs would be wrong when it was going to die. It shares a ground with the ICU. These are little clues. If you do it yourself it could be $100 to $800 US. If you take it to the dealer it could be $100 to $4000 depending on how long it takes to find the problem. Good luck with the car.
 
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