2000 S500 - Need advice/help - Having problems - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 07-09-2007, 08:19 AM Thread Starter
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Unhappy 2000 S500 - Need advice/help - Having problems

Hi Benz World!

I bought a 2000 S500 back in January. Ran fine until the summer started and the temperatures got hot.

Sometimes after a long drive (approx 30 minutes), I park and stop the engine and after a few minutes later I try to start it back up, the car does not start. It makes the sound as if it is about to start, but nothing happens. After sitting about 20 minutes, it starts back up normally. I would like to take it to the benz dealership, but I want to know what I should be looking out for or what could be the possible problem.

Other malfunctions:
1. The gas tank open sign appears randomly while driving and theres nothing wrong with that.

2. Sometimes when the car is idle, waiting at a traffic light or sitting there while engine is on, it starts shaking lightly.

Thanks in advance!
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post #2 of 11 (permalink) Old 07-09-2007, 08:34 AM
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what do you mean "makes the sound?" Does it crank or not?

I'm not familiar with this gas tank open sign either. Does the check engine or low fuel light flash?

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post #3 of 11 (permalink) Old 07-09-2007, 08:44 AM Thread Starter
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a

It cranks, but does not turn on.

Check engine light in on.
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post #4 of 11 (permalink) Old 07-09-2007, 09:42 AM
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Quote:
Originally Posted by gahmed
It cranks, but does not turn on.

Check engine light in on.
Could it be crankshaft position sensor? I've never had this problem but I see a lot of posts about it. Should behave like that.
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post #5 of 11 (permalink) Old 07-09-2007, 09:59 AM
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Quote:
Originally Posted by gahmed
It cranks, but does not turn on.

Check engine light in on.
The check engine light can mean more than the gas cap is loose. You'll have to dump the codes to determine why the light is illuminating.

I agree with Diesel Benz, it sounds like you need a crankshaft position sensor.

If you have the original equipment, eight year old motor mounts, they're possibly in need of replacement. This would cause the engine to shake as you've observed.
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post #6 of 11 (permalink) Old 07-09-2007, 11:23 AM
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Sounds like you may have a pluged vent hole on your gas cap. Most times you will need to replace the gas cap and that should fix your problems.
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post #7 of 11 (permalink) Old 07-09-2007, 12:16 PM Thread Starter
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Thanks for the responses!

Dumb question, but what is a crankshaft position sensor and how much do you think it would cost to get a mercedes dealer to fix this?

Thanx!!
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post #8 of 11 (permalink) Old 07-09-2007, 12:41 PM
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Parts and rough locations here:
Ê*ò*ëîã
But as mentioned, you should really get the codes read and not start changing parts based on (educated) guesses.
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post #9 of 11 (permalink) Old 07-09-2007, 01:20 PM
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A CPS has a list price of $115, my dealer sells them for $90, and they are available on the net for $80. A dealer may bill you an hour. As Diesel Benz posted, swapping parts on a guess is not the besy way to go about the repairs. The check engine light causes a code to be stored. That code can be read and the problem determined.
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post #10 of 11 (permalink) Old 07-09-2007, 03:35 PM
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if its the crank sensor as mentioned, with your symptoms, it will have definitly set a code for it (L5). The CPS is notorious for failing without setting a fault, but again, in your case, there should be a fault stored. The sensor is located on the upper left (driver) side of the rear of the engine block, right next to the trans bellhousing. One E8 bolt holds it on. I believe total time (diag and replace) is 1.6 at a dealer, or you can do it yourself, its not too difficult to get at, just use a few extensions...

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