SL/SLC-Class (R107) 1971-1989 : 250SL, 280SL, 450 SL, 380 SLC, 450 SL, 380 SL, 560 SL

SL/R107: 450 SL cold start issue

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Old Nov 25, 2019 | 08:36 PM
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1979 450sl
450 SL cold start issue

Hello,

I have a 79 450 SL that I was gifted. I’m very new to auto mechanics, but have been working on this car a bit lately.

when I got the car it fired up every tine, ran but ran like **** and got hot.

I replaced the thermostat, it fired right up and I drove it to check the temperature. Temp was pinned at 175ish and didn’t get hot.

the next day it would crank and crank but never start. This led me down a crazy (For me) path and the following is what I have done.

replaced the fuel pump and filter, replaced the battery and distributor cap and rotor and set the ignition timing to TDC.

I can get it to start and run but in order to do so I have to advance the distributor considerably and then move it back once it has warmed up.

wondering if anyone has had this problem or has a good place to start in addressing it. Thanks for your patience, like I said I’m really new to this, the most I’ve ever done to a car prior to this is fill it with gas.

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