2003 S500 Running Rough at Idle - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 01-05-2011, 11:27 AM Thread Starter
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2003 S500 Running Rough at Idle

Hi guys,

I have a 2003 S500 with about 60,000 miles on it, starting a few weeks ago every once in a while when I pull up to a traffic light the engine will start running rough, if i do not put it in neutral and give it a little gas it will actually stall out. It does not happen every time and does not happen that often, it could happen at one light and 2 minutes later at the next light it will be fine.

The Check Engine light did come on once and stayed on for a couple days and then went out, i always thought once it came on it would not go off until it was reset.

At speed it runs great, i have actually driven it twice from Ohio to NC since the problem started with no issues....I have run Fuel Injector cleaner through the system but can't really tell a difference.

Any ideas????

Thanks

Nick
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post #2 of 6 (permalink) Old 01-05-2011, 11:40 AM
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The CEL will reset after several drive cycles if the error causing it has self adjusted. Have the DTC (diagnostic trouble codes) read with an OBD2 scanner before going any further. Autozone, etc. will do that for no charge. Good luck.

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post #3 of 6 (permalink) Old 01-05-2011, 12:04 PM Thread Starter
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Thanks..can the DTC be read if the CEL has gone out?
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post #4 of 6 (permalink) Old 01-05-2011, 02:44 PM
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Originally Posted by Nabco View Post
Thanks..can the DTC be read if the CEL has gone out?
Yes.

When enough or certain errors are logged, the CEL is lit. If the issue is resolved, the CEL will go out on it's own (so if you drive long enough after it goes out, the codes may be erased). However, until the trigger point is hit in the algorithm, you can have stored/pending codes without ever triggering the CEL.

So get them read. Some auto parts stores will do it for free, and Aamco says they will, too. Get the codes, then check them against the list in the forum.

Also, click user cp and add your vehicle and location to your profile, it's useful information.

Good luck.

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post #5 of 6 (permalink) Old 01-06-2011, 09:15 AM Thread Starter
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Thanks guys, I am going to try and get to an AutoZone today.

Profile updated too...
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post #6 of 6 (permalink) Old 01-06-2011, 08:13 PM
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The advise is well and good. I just will add that 60,000 miles is a big milestone for service: tranny flush, injection clean up, ignition tune up, filters replacement, probable catalytic converter failure, polution controls clean up... even though the schedule specifies some items for 100,000 miles.

It all depends on how you keep your cars, I prefer to rely upon them to start and go at any time.

A car would show appreciation for preventive maintenance by never leaving his owner stranded.

Defensive Driving is never having to say you're sorry: a true love story between man and machine.
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