SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Trouble shooting very low power on 05 SL600. No codes!!

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Old Jul 9, 2018 | 11:29 PM
  #1  
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2005 SL 600,2002 M3,1993 Vette!
Trouble shooting very low power on 05 SL600. No codes!!

Can’t figure it out!
waiting for MAP.
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Old Jul 9, 2018 | 11:39 PM
  #2  
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2003 CL 600
All the time? Worse when hot? Intercooler system working 100%?
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Old Jul 10, 2018 | 12:28 AM
  #3  
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2005 SL 600,2002 M3,1993 Vette!
Same hot or cold.

How would I know if the inter cooler is working 100%?

Car idled smooth drives smooth but when you get on it it’s 10% what it was before.

I just changed the right side coil pack.
codes showed right bank misfire on all cylinders.
Did not help. Turned out it was the voltage transformer. Also changed all 24 plugs.

No codes! Sounded good! I took it for a ride.
No power when you get on it.

Discovered broken MAP. Ordered one.
Put it on. Same thing. No power!

Discovered wrong MAP.
Ordered correct MAP. Waiting. Fingers crossed!!
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Old Jul 11, 2018 | 08:24 AM
  #4  
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SL600 2004
I had this issue when my intake air and pressure sensor died. When its dead, ECU completely shuts down turbos and it feels like you're running something with 100hp or similar. And actually it died completely when mechanics were working on coil packs.
You can easily check it, its right on top of the engine, above the voltage transformer. In my case there was an error code stored in the ECU, but i believe it can be the same with no codes shown.
The sensor itself can be ok, but connecting hose can be damaged.
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Old Jul 11, 2018 | 01:58 PM
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Got it figured out!
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Old Jul 11, 2018 | 02:14 PM
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So was it the MAP sensor that did the trick?
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Old Jul 11, 2018 | 05:36 PM
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Nope!
you’ll never guess this one!

It’s very strange! I called an Independent MB shop
and they said it was a coincidence!

Cue the Twilight Zone music!
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Old Jul 11, 2018 | 06:52 PM
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Old Jul 11, 2018 | 06:57 PM
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SL 600
eBrake was on?
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Old Jul 11, 2018 | 09:56 PM
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Maybe you left something unplugged? Well, that would probably throw codes. I give up!
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Old Jul 14, 2018 | 10:53 AM
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SL55, S500
well?
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Old Jul 18, 2018 | 03:38 PM
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I don’t drive the car very much and had over 500 days past the service B showing on the instrument cluster.

I did the service B but forgot how to reset it.
Everytime I would drive it I would try to reset it and thought I did but when I started it the next time, there it was.
So, while I was going to bring it to an independent repair shop the next day I went up you tube and found out how do do it again (good old you tube).

I was sitting in the driveway after I had just returned from a disappointing test run, reset the service B and started off to the repair shop.

On the way there I got on it again and “Eureka “
the BadMobile was back alive!

I was amazed!! All I did was reset the service B.

I called the MB service shop, Fritz & Hans, told them the story and they said No Way!

That’s my story and I’m stickin to it!!

Last edited by horrible; Jul 18, 2018 at 03:41 PM.
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Old Jul 18, 2018 | 04:44 PM
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My service reminder is at about 400 days (not because I don't work on the car...I do that all the time) because I have not reset it either.
And I told my wife I wanted to see what happens when I reach a year past due.
Now I think I'll wait until 500 days and see if this sets a limp mode!
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Old Jul 18, 2018 | 05:53 PM
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Mine was some where around 580 days!
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