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Old 12-19-2003, 09:45 AM
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Join Date: Feb 2003
Location: roslyn, LI,NY
Posts: 445
cant start 450sl 1977 sometimes after run.

About once every few months, after parking after an hour, cant get car started. Cranks, even starter fluid n/g. If I wait about another i/2 hour, it will start right up. Any suggestons amoung the 1977 sl mavins? Thanks, lots, for any help. Abe G PS car runs well otherwise, good idle, slightly rich., poor gas milage.

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Old 12-19-2003, 12:12 PM
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Join Date: Oct 2003
Location: Ventura CA USA
Posts: 38
leaky fuel injectors

my 88 560 SL with 100k miles does the same thing. if the injectors leak out the fuel in the system, when hot the increased pressure in the system drives the fuel out of the system, requiring a bit more cranking to get the injector prossure back up. I usually give it about 1/4 throttle, and it starts right up.

this is a bad situation to let go. i confirmed it when i changed the plugs out and they all smell heavily of fresh gasoline when pulled out 20 minutes after shutdown. all that extra gas is either soaking ontop of the intake valves and boiling off leaving varnish and gummy crud, or it is ending up on top of the piston doing the same, or worse leaking down the side and washing oil from the cylinder walls and drying or gummin up the rings. this should be addresses of you can confirm the leaking by a smell / look test or watching the fuel pressure fall with a gauge after shutdown.
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Old 12-20-2003, 10:05 AM
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Join Date: Feb 2003
Location: roslyn, LI,NY
Posts: 445
1977 450sl hard start after run sometimes!

The minute the flatbed delivered the m/b to the ship, it started at once, one turn of key! 2 days in shop, all sorts of test,s starts each time one key turn! frustrating!! Problem is it stuck my wife 2 days in row with no start after run! Last time this happened was a year ago, otherwise car runs wel. It looks like it starts after about one hour cool down whenever this happens. Your suggestion appreciated Abe G PS no obvious gas smell or leak fuel prressure checks ok
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Old 12-20-2003, 06:53 PM
Senior Member
Join Date: Jul 2002
Location: visalia ca
Posts: 368
well your questions came almost before you checked
if you used starter fluid while cranking and it had no
effect then it points directly to a no spark condition.
so do you or don't you have spark at the time of no start??
got spark from the coil? dist cap and rotor ok?
i'm betting on the control unit.

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Old 10-24-2014, 09:39 AM
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Join Date: Jul 2013
Location: Houston,Texas
Posts: 4
1977 mercedes 450sl

just got a 77 Mercedes 450 sl in the shop towed in said it stalled went out started right up test drove it and ran ok slight misfire,idled high so adjusted idle control let it sit for a while then went to restart and cranks and no start,..suggestions?
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Old 10-31-2014, 07:21 PM
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Join Date: Sep 2001
Posts: 1,112
Had this on a 380SEL it was corrosion (severe) in the coil at the high tension tower. New coil and wire, problem solved. It is worth checking.

Does a Caddy stretch? No, but a Mercedes bendz.
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