I have a 2001 S500 with 130,000 miles.

The car takes about8~9 seconds to start, the starter keeps spinning and engine tries to start and finally does after few seconds. It is embrassing and I dont want to burn my starter.

I have already changed the Crank-Position Sensor, spark plugs, MAF sensor, and purchased a new key. Still the problem remains. There is no check engine light or codes.

Has anybody had similar problems? Could it be a fuel related problem? Fuel Filter?

Any help will be greatly appreciated.

Thanks,

Al

I would have the fuel pressure checked.
You are due for your second fuel filter by now.
60k or 5 years per the maint manual.

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Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?

absolutely check fuel rack pressure,residule pressure is necessary for quic starting.access fitting is on the right side forward.get specs from benz.a liquid direct pressure gauge is needed.they are inexpensive.

As others have stated, low fuel pressure can cause the type of behavior you are experiencing. On my E320 with the M104 it was resolved by replacing the fuel pressure regulator, as it was shot and was allowing pressure to leak down after sitting for a while. I had to crank about 10 seconds before it would start up. Your S500 is different; I don't even know if it has a similar fuel setup. But you might want to start here and dig deeper...

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86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

I think the regulator is built into that fuel filter. Just as the others said check fuel pressure.

[quote=amgbenz;1647266]I have a 2001 S500 with 130,000 miles.

The car takes about8~9 seconds to start, the starter keeps spinning and engine tries to start and finally does after few seconds. It is embrassing and I dont want to burn my starter.

I have already changed the Crank-Position Sensor, spark plugs, MAF sensor, and purchased a new key. Still the problem remains. There is no check engine light or codes.

Has anybody had similar problems? Could it be a fuel related problem? Fuel Filter?

Any help will be greatly appreciated.

Please do a search on "S500 Home at Last." Arrow down to cdplayer. That's me. I spent some $11,000 in repairs both electrical and mechanical a while back. Repairs that began just two days after I drove it home.
Perhaps there is some info in there that would be helpful to your model.
If not now, in the future.
These are beautiful cars. I have exceeded a year now with no problems what so ever. Confidence returning with my weekend warrior

Thanks, Dan

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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