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Warm up issues 450SL 78

  • kwelch02
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20 Jun 2020 01:57 #14216 by kwelch02 Mercedes-Benz R107 450 SL
Warm up issues 450SL 78 was created by kwelch02
My name is Kevin and I live in Michigan. I purchased a 78 450 sl a few months back and have been enjoying myself working on it. I am finding that it is a well built car and it is my first MB. I really enjoyed rebuilding the brakes, front end, cooling system and fuel system. The car runs great, except when it warms up, it starts to stumble a little upon first acceleration. Since I have replaced the entire fuel system in the back and cleaned out the fuel tank, I am considering purchasing a rebuilt wUR.

Any advice would be greatly appreciated

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  • Rudiger II
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20 Jun 2020 07:26 #14217 by Rudiger II Americas (USA / CAN)
Replied by Rudiger II on topic Warm up issues 450SL 78
Hello Kevin, welcome at Oldtimer tips.
Somebody will help you to get your 450sl running smooth.
Rudiger
Hollywood , MD.

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  • Volker
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20 Jun 2020 07:55 #14219 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Replied by Volker on topic Warm up issues 450SL 78
Hi Kevin,

you need to measure system and control pressure between your fuel distributor and warm up regulator. Your control pressure determins how rich or lean your mixture will be. I have recently written an article how to build a K-Jetronic fuel gauge. Unfortunately it is in German and I still have to translate it.

Article building a K-Jetronic fuel gauge in German

Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles über den Mercedes-Benz 107 SL/C in Sternzeit-107.de

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  • kwelch02
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20 Jun 2020 15:05 #14224 by kwelch02 Mercedes-Benz R107 450 SL
Replied by kwelch02 on topic Warm up issues 450SL 78
I was able to translate this article to english. But, It is a little overwelming procedure and not sure I have the capability to do this.

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  • Volker
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20 Jun 2020 15:24 #14225 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Replied by Volker on topic Warm up issues 450SL 78
Hi Kevin,

have a look at configuration MB-KA in paragraph 6. It tells you which parts to buy. After that you can measure your system and control pressure and find out whether they fit or whether you need another WUR.

Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles über den Mercedes-Benz 107 SL/C in Sternzeit-107.de

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