Bro...

Your dealer has their head in the clouds. I can promise you it's the IC pump. I bought my 2004 E55 AMG about a month and a half ago, maybe two. Just like your baby, it had 40000 miles on it (ok, so 39,688 to be exact). I was running door to door with my brothers LS2 GTO (400HP), and after my supercharger disengaged numerous times he would stomp on me like I was an E320. I took it to the dealer (as per the advice given by mbworld forum members) and requested and IC pump change. It was done and nowadays... well... I stomp GTOs, Gallardos etc.

Trust me! It's the IC Pump. Get a new one and get your beast back!

Here was my thread started in honor of the failing S/C and retarded IC pump:
https://mbworld.org/forums/showthrea...ghlight=Exodus

 

OK, I'll get a Johnson IC pump and have it installed by someone else.

My question is this............obviously it's overheating and the computer is shutting down the supercharger.........it makes sense that the IC pump may be failing...BUT....what about the times when the supercharger does NOT shut down??? It's still running CRAPPY times.........at least 6 tenths of a second slower than it used to.........and at least 6 mph slower than it used to, when the supercharger is ENGAGED.

When the supercharger doesn't engage, it would probably run in the 16's at 85 mph........but that's not what I'm worried about. I'm worried about the crappy times when the supercharger DOES work.

 

obviously, it's difficult to properly diagnose anything over the internet but as i've mentioned, your symptoms are classic i/c pump and ecu recall/reflash.

traditionally, it was unheard of for our cars to run lean, in fact there's pages upon pages of how these cars run pig rich under any and every condition. one of the problems with the reflashed ecu was that it allowed the car to go lean. when that happened, iat's would rise, as well as engine temps, the ecu would make further adjustments by dumping fuel and retarding timing. that whole scenario is detrimental to making power. the other problem after the ecu reflash is that the load limiter settings get altered and hidden. this appeared to reduce the total amount of tq allowed to be put to the pavement, mostly in 1st and 2nd gear. there may be other changes that are happening but these two definitely help explain the half second loss in 1/4mile times that many post ecu recall cars suffered.

the biggest problem with the reflashed ecu is that the dealers don't know how to diagnose this, let alone fix it and mbusa most likely won't allow them to anyways. this leaves you with very few options, the easiest and most reliable one being pay out of pocket for powerchip to flash their software to your ecu.

 

OK, I took the 2004 E55 to be dynoed today.

First run = 336 RWHP
Second run (after a 15 min cooldown) = 355 RWHP

Both times it ran very rich.

I understand that normally they dyno about 400-410 RWHP.

I took the dyno sheet and went BACK to Mercedes again.........they are going to take one more shot at it.

 

Can you post the graphs?

Or can you get your raw dyno data from the dyno shop? They can do it.

 

those are almost identical to the numbers i showed after the recall. i doubt they'll be able to fix it but make sure mb at least pays for the follow up dyno after their work.

i'd definitely like to see the graph as well.

 

I had my reflash done last year. I've been too afraid to take it to a dyno...I might cry if it comes out like those did. My stock dyno with 1k miles in almost 90 degree heat was 400/468

 

Sure, here is a picture of the graph.

The second run was actually closer to a 10 minute cool down.

 

that thing is running pig rich, no wonder you are not making power..

 

it's obviously running rich but the lean spike at 4300rpm has my attention. this is what my car was doing after the flash. it would richen up with wot until a certain point then start to go lean(er) and the ecu would counter with a massive fuel dump and pull ignition.

hopefully vadim can offer more insight.

 

I think it is rich because it is not making the power it is suppose to.

It almost seems like it does not make all of its boost or there is a boost leak somewhere.

Definitely have dealer check it out.

 

They have checked it out THREE times already. This time is now the FOURTH time. Last time they replaced the entire supercharger..........to no avail.

 

Than, I would recommend getting an OBDII scanner and looking at data yourself.

Just google "OBDII scanner" or go on www.nology.com

What city are you in?

 

I have an autotap, I just don't know what to look for. I am in Temple, TX.

 

iat, ignition advance, rpm, load, and coolant temp would be a good place to start. you can save and post the file since several members have the software to read it.

btw, have you seen this thread yet:

https://mbworld.org/forums/w211-amg/207254-euroelites-software-tune-results.html

 

Get a new dealer.....

 

+1000000000

 

Happy2th,

Any new updates on this?

 

Mercedes still has my car. It's been 2 weeks now. Maybe they're actually doing something.............

 

Doesn't the dealer have this tool? I would have them show me the data they are getting from the car, it shouldn't be the customers responsibility to buy products to show them problems with the car.

Wouldn't a new ECU fix this problem?

I'm having problem with my tranny after an update and I told the dealer to put a new computer, tranny, etc. just fix it. It's under warranty.

 

OK, I finally heard from my dealer. After having my car for TWO WEEKS, this is what they told me.........

They contacted the "higher ups" at Mercedes and they were told that Mercedes is aware of the power loss resulting from the ECU reflash and that I am not the only E55 owner to have this power loss. They also said that they consider the power loss to be "acceptable" and that they will NOT reflash the ECU back.

My neighbor is an attorney and I have contacted him about this matter and he thinks that I have a good case for a lawsuit. I have documentation of my timeslips before the recall, I have documentation of my timeslips after the recall, and I have a dyno graph from my horsepower after the recall. I think that is the road I'm going to take now. Yes it would be less expensive to just have an aftermarket company reflash my ECU for me, but I shouldn't HAVE to. I am going to FORCE the issue with Mercedes.

I will never buy another Mercedes again.

 

as much as this sucks for you, i'm SOOO glad someone is finally going to step up to mb!!! lol, there are probably enough people on this board to get a class action going. keep us updated and BEST OF LUCK TO YOU!!!

 

I talked to the owner of Mercedes Benz of Sugarland (where I leased this car originally). He wants his service department to have a crack at it. He said that if my car is really 70 HP down from normal that there is definitely something wrong with it and he'll get to the bottom of it. He also suggested that the IC pump could be going bad........exactly what I told the MB dealership here (all 4 times that I took it in), but they said it was fine. We'll see what happens.

 

My horsepower is BACK!!!!!!

Mercedes Benz of Sugarland solved my horsepower loss in less than 4 hours!!! The other dealership had the car a total of 5 weeks and was unable to solve the problem.

It was a completely NON FUNCTIONAL intercooler pump. (To all those who said it was a bad IC pump,,,,,,pat yourself on the back.) They said it wasn't working AT ALL.........no movement. The intake temperatures under load were over 200F. Why the other dealership could not figure this out is BEYOND ME..........especially since I suggested that the IC pump may be bad EVERY TIME I TOOK IT IN.

I took it to the track again..........first run.........2500 feet density altitude.....12.7 @ 114.5 MPH.

The beast is back!!!!

 

congratz bro!