SL55 AMG, SL63 AMG, SL65 AMG (R230) 2002 - 2011 (2003 US for SL55 and 2004 for the SL65)

SL55/63/65/R230 AMG: my 03 cl55 slows down and feels heavy after 120 mph

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Old Dec 1, 2008 | 12:33 AM
  #1  
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2008 CL63 AMG 2003 cl55 amg SOLD
Unhappy my 03 cl55 slows down and feels heavy after 120 mph

when i drive my car fast everything is smooth till i hit 90 mph the car takes a while to go faster,,?? what could be the problem, please help ?i'm freaking out
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Old Dec 1, 2008 | 12:44 AM
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86 190E 2.3-16v, 92 500E, 03 CL55 AMG, 08 E3504M Brabus
Is your supercharger shutting off? You could be soaking heat, which means you have an intercooler pump problem. Did you happen to check your engine temp when this occurs? Generally, 03's are testy...
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Old Dec 1, 2008 | 12:56 PM
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2008 CL63 AMG 2003 cl55 amg SOLD
my car's temp is almost 90 is that normal

is that a big problem??? thanks for your help
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Old Dec 3, 2008 | 07:57 AM
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I've just had the same problem with my SL55. Seems to be a fairly common issue with the 211 55K engine, but luckily it's a simple and fairly inexpensive thing to get fixed.

Over in UK a new pump is $300, but I think they're cheaper in US ($200ish). A decent garage should only need 1-1.5hr labour to replace the pump and you'll be back to normal.
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Old Dec 3, 2008 | 09:44 AM
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its a sign from God telling you to upgrade to the 65s
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Old Dec 3, 2008 | 10:43 AM
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'03 SL55
Originally Posted by palicl55
is that a big problem??? ....
Yes, it is. Especially if your 2003 is still using the original pump. The pump on my 2003 failed last summer.

Originally Posted by crazeazn
its a sign from God telling you to upgrade to the 65s
LOL. Great perspective!
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Old Dec 6, 2008 | 07:35 PM
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Loss of power

I had all the symptoms relating to the intercooler pump failing on my 03 SL55 and therefore changed out the pump for the much recommended Johnson 030unit - but same problem remains. After a hard acceleration (with lots of power on tap), it's as though someone disabled the Supercharger on run number 2.
Any ideas?
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Old Dec 6, 2008 | 11:35 PM
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Originally Posted by phackett
I had all the symptoms relating to the intercooler pump failing on my 03 SL55 and therefore changed out the pump for the much recommended Johnson 030unit - but same problem remains. After a hard acceleration (with lots of power on tap), it's as though someone disabled the Supercharger on run number 2.
Any ideas?
May need to double check your pump again. I had two fail in a four month period... The 3rd one has been fine for a while now..
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Old Dec 7, 2008 | 11:27 AM
  #9  
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'03 SL55
Originally Posted by Exotic-metal55
May need to double check your pump again. I had two fail in a four month period... The 3rd one has been fine for a while now..
+1. Those symptoms point to a cooling problem.

A datalogger will tell you the exact intake air temperature that your car is running. They aren't all that expensive in the context of owning an MB. You are also welcome to borrow mine if you feel like making the trip up US-23 to Ann Arbor.
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Old Dec 9, 2008 | 07:29 PM
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Thanks for the offer - very generous. I've taken the car off the road for the winter months as it's never seen salt in its life (FL car).
BTW, I just plugged in an OBD II reader and found multiple PO 0451 codes - Evaporative emission control system, pressure sensor range or performance problem. Any ideas if this might be related?

Thanks again.
Paul
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Old Dec 9, 2008 | 08:26 PM
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'03 SL55
Originally Posted by phackett
Thanks for the offer - very generous. I've taken the car off the road for the winter months as it's never seen salt in its life (FL car).
BTW, I just plugged in an OBD II reader and found multiple PO 0451 codes - Evaporative emission control system, pressure sensor range or performance problem. Any ideas if this might be related?

Thanks again.
Paul
I hear you about the salt.

There's nothing on the Star Service DVD about P0451. Google searching on P0451 points to a problem with the EVAP pressure reading. Possible causes are all over the map, from a faulty gas cap to a faulty sensor to a faulty fuel pump.

So, yeah, possibly related.

If it was my car, I'd probably replace the fuel filter and add some fuel stabilizer as a low cost, low risk shot in the dark. If that didn't work I'd go into the dealer.

Hope you're able to get to the bottom of it.
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Old Dec 10, 2008 | 07:36 PM
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Thanks again, good advice.
I also checked the code out on the internet and came up with the same conclusions. I cleared out all of the codes and will take the car out when the weather improves to replicate the problem. I'll then see if the same code re-appears - if so, I'll know for sure that it's related.
Of course, I'm looking at 4 months before that will happen - gloom!
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Old Mar 15, 2009 | 12:59 AM
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Question

Originally Posted by phackett
Thanks again, good advice.
I also checked the code out on the internet and came up with the same conclusions. I cleared out all of the codes and will take the car out when the weather improves to replicate the problem. I'll then see if the same code re-appears - if so, I'll know for sure that it's related.
Of course, I'm looking at 4 months before that will happen - gloom!
Have you taken car out yet?
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Old Mar 15, 2009 | 01:15 AM
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pick up
I have the same problem as yours...
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Old Mar 15, 2009 | 03:52 AM
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Originally Posted by phackett
Thanks again, good advice.
I also checked the code out on the internet and came up with the same conclusions. I cleared out all of the codes and will take the car out when the weather improves to replicate the problem. I'll then see if the same code re-appears - if so, I'll know for sure that it's related.
Of course, I'm looking at 4 months before that will happen - gloom!

COULD YOU TELL ME WHERE YOU CHECK THE CODE?
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Old Mar 15, 2009 | 04:19 PM
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Old Mar 15, 2009 | 04:30 PM
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We have had guys install the pumps wrong. Additionally, it sounds like there are a couple of other issues that need to be addressed. It might be time to visit the dealer!
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Old Jul 21, 2010 | 02:28 AM
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Very fast
I have the same code, and don't want to start taking apart the fuel system. How did you guys solve the problem? Thanks
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