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Old 09-04-2003, 05:32 PM
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Join Date: Sep 2003
Location: los angeles
Posts: 1
Unhappy 75 450slc hot start

I am having a problem starting my '75 450 slc after it is warm. I have been dealing with it, but the "hot start" problem is getting to be a bit much...any suggestions?...i am desperate...thanks
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Old 09-04-2003, 06:53 PM
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Join Date: Sep 2001
Location: Austin, TX
Posts: 563
Very common problem for that year. The biggest reason is that the catalytic converter is in the engine compartment. You need to maintain fuel pressure to combat the additional heat.

If you don't have external check valves on your fuel pump(s) (I think you only have one), then you should add one. Make sure none of your injectors are leaking. You'll need a pressure gauge to attack this problem. 1975 should be an EFI system.

Depending on the laws in your state, you may be able to bypass the cat.
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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Old 09-04-2003, 09:18 PM
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Join Date: Jul 2003
Posts: 33
I have the same car. Does anyone know of a source to get pre-75 exhaust manifolds so you can bypass the convertors? It looks like the convertors are part of the manifold so you wouldn't be able to just take them off and replace with pipe. My underhood temperatures are extreme! Even if I just let it idle for 10 minutes to circulate oil it gets hot. I think the cats have to be a big part of that problem.
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Old 09-08-2003, 10:57 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Timevalve (on the web and in Hemmings) sells very high quality stainless exhaust systems. They can help you.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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