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




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.
Any ideas?
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Any ideas?

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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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.
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
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
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.
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!
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!
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?




