S500L W220 1998 INTERMITTENT NO START

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Apr 6, 2007
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Age
64
Location
Eccles,UK
Your Mercedes
S63L AMG 2007 V8, S500L/1999/V8,SLK 200 Kompressor 2001,Porsche 911 1967 2 litre
Hi,
The car runs fine and starts well, however recently when warm it has failed to start so far twice, it has done 110,000 miles.
The starter motor will turn the engine until it times out, it sounds like it is out of fuel, it is not I checked. Called the AA and they reckoned it was a sticking fuel pump, they banged on the rear boot wall while cranking and it started.
It then started 5/6 times without fail, we put a new fuel pump in assuming that would cure it. Ran it for a few days and the same thing happened again, from warm. I swapped the fuel pump relay but it made no difference. eventually after thumping the boot wall several times it started.
I wonder if that is just coincidence and a faulty part has cooled down and reset itself.
Any ideas?
 

alexanderfoti

MBO Forum Supporter
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Tonbridge
Your Mercedes
W221 S65 AMG - W204 C63 AMG + Various other MB's
Sounds like a common crankshaft position sensor failing. They go when they get hot. Common time is when sitting in traffic, or stopping after a long journey, for it to then fail to start.

£40 pound odd part. 1 hour labour to change.

When they go cold again they function normally.
 

Pathfinder

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Gourock
Your Mercedes
CLC 220 CDi Sport Diesel Year 2008
As above, crankshaft position sensor is my bet.
 

shine

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Nov 2, 2010
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Location
Hampshire
Your Mercedes
CL 500.W216 + C300 Coupe AMG Line 2018
Same thing happened to my S500 a new CPS fixed the problem.
 

television

Always remembered RIP
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Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Yes CPS, mine went on the 216 and £26 from MB and ½ hour to fit, some are pigs to get to and the Bosch versions can cost £100.

Fine when cold but stopped all the time when hot
 

alexanderfoti

MBO Forum Supporter
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Messages
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Your Mercedes
W221 S65 AMG - W204 C63 AMG + Various other MB's
Yes CPS, mine went on the 216 and £26 from MB and ½ hour to fit, some are pigs to get to and the Bosch versions can cost £100.

Fine when cold but stopped all the time when hot

Welcome back Malc! Good to see you!
 


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