palicl55

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

AMGTestDriverNJ

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...

palicl55

is that a big problem??? thanks for your help

danski

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.

crazeazn

its a sign from God telling you to upgrade to the 65s

jmf003

Yes, it is. Especially if your 2003 is still using the original pump. The pump on my 2003 failed last summer.

LOL. Great perspective!

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?

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..

jmf003

+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.

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

jmf003

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.

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!

c32used

Have you taken car out yet?

jagass

I have the same problem as yours...

biggs247

COULD YOU TELL ME WHERE YOU CHECK THE CODE?

BMS

Phacket-- I live right around the corner from you. I might be able to help if you pm me. Mike Scott

IngenereAMG

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!

hatchy

I have the same code, and don't want to start taking apart the fuel system. How did you guys solve the problem? Thanks