berti_00

That's a good question, and would like an answer too

SavMan

I also moved the map sensor or at least where it measures from, each of the surge tanks were drilled and a feed taken from each cylinder bank into a T-Piece and the map sensor attached to the T.
The drive of the car was transformed much smoother gear changes particularly town driving. However it didn't solve the issue so was back to square one!

DonnieD

I dont. Im out of the business. I now own a boat dealership.

I could have the car reflashed, but i think it is deeper in the control unit than that. I would bet a brand new updated engine ECU and a reflash would fix it.

E55Greasemonkey

Bummer, but congrats on getting out!! I know MB's flashes can access things that no tuner can..... My ECU is the original 2003 production, that's why I think a dealer/MB flash might do it.

Roverron

I wonder how Renntech is doing it?
There is no way some one is paying all that money and worrying about a CEL.
Why not get one of those cars on a test drive and pull their file?

crazyfox

Hmmm I want to play with fire too!

DonnieD

I dont have any CEL problems. The car runs perfectly and fast most of the time. The only problem is the hiccup/ stumble after driving easy for 10 min or so, then accelerating after that. At times, i think it is a limp mode of sorts. After restart it goes away. Also, i have the map sensor code on occasstion after this episode. I think this is due to too little vacuum or the throttle angle being too low at a given map when at 50-70 cruise with very little throttle.

Crissus

Anyone knows the answer?

saleen01

im 2 days now with my 82mm on....mixed driving street and highway...mine is from an 07 S550 car has been EC tuned ....runs good so far.

E55Greasemonkey

Along with driving it every day, I completed two 300 mile round trips (highway) without so much as a hiccup. I even tried the 70mph cruise with light acceleration up a hill (bridge) without problems.

Roverron

I think I found my problem its the gasket between the bypass flap and the main T/B

E55Greasemonkey

Maybe...but that particular seal is an extremely tight fit, has to be installed with plenty of lubricant. Even when installed properly the seal will distort somewhat like what you see, and one side will have the fins smashed flat while the other side won't, but it is still sealed. What I'm trying to say is this seal does not seat evenly..normally that would look like it was bad, but the fins being flattened tells me it was likely sealed.

E55Greasemonkey

When reassembling, there is also a factory tool (guide pins) that help align and hold the intake gaskets perfectly in place while the supercharger is being lowered into position. This is the part where it's easy to damage or bend the intake gaskets, and risk a very minor vacuum leak. I have the tool at work. Here is a picture; the part on the right is the removal tool once the SC is in place, the studs are removed and the bolts installed. MB part# 112 589 02 62 00

http://www.samstagsales.com/mercedes/mb112589026200.jpg

E55Greasemonkey

How do the old intake gaskets look?

cm60k

is this gasket comes separately, what’s the part# of this gasket.....??

ZAYED,,

Roverron

Well when I spray in this area the car would stumble when idling. That's what made me take it apart. I looked at intake gaskets they didn't look bad. I cut studs to screw in. To guild the s/c down. I was going to order a new part if its cheap enough but if you think it will re seal then ill reuse it.

E55Greasemonkey

If it was stumbling then you found your problem (vacuum leak) in that area, I did not mean to reuse that seal, get a new one. Of course get new intake gaskets, etc as well. Also check around the area for anything else, are you using the "-04" original or "-09" SL55 inlet? If the SL55 inlet how are you sealing the open port? How is your TB sealed to the inlet? Just thinking about other things to check while its apart.

Denroll

I've set up my data logger to grab just about every signal available and I'm going to log a few instances of the hiccup. I'll have voltages and fuel trim for all four O2 sensors to go along with TPS%, speed, RPM, IAT, etc. I'll post some screenshots and maybe we can find something strange going on.

Does anyone who has this hiccup still on stock headers?

SavMan

Wish you luck but not convinced you will see anything of value. 82 TB was the first mod fitted to my car, ECU was stock. The idle was lifted for both P & D and TB Blade opened to max 2.5%. The car was then driving to another shop where the Crank pulley, decat and remap was to be done but it thru the code on the way and has done ever since.

So stock car with just 82mm TB, I logged and the tuner spent 4 days trying to get to the bottom of it with no luck.

Denroll

Here's a screenshot of the hiccup log with all of the O2 sensor data. It happens right when the voltages for the front sensors go from ~0.81v to .06v

SavMan

That's pretty much what I see on mine. I could not determine anything other than the result of the hiccup.

The code that flags in STAR is B28 Pressure Sensor Signal Implausible

My AFR reading does exactly the same as your 02 sensor voltage is showing which is that it shows lean and then straight after the STFT go to full +

But both of these seem to be a result of the ECU not liking the reading of the B28 Map sensor rather than the cause.

Denroll

I tried to pull my codes this morning... but left my SD card in my computer. D'oh! DashDAQ will not pull codes without the SD card in the slot.

Bramage

Here are your O2 voltages:




Here are mine:



Here is a related chart to proper O2 operation..




BUY 2 NEW O2 SENSORS!!!!

Bosch 16272 <-- double check that before you order. That's just off the top of my head


Edit- When the O2 finally switched after about 4 missed cycles, the ECU said: Nope: Not on my watch, here: Have a default fuel map that will make sure you dont blow up your engine (Then you see +25 STFT.. as the new map ensures you do not encounter a lean condition)

E55Greasemonkey

Interesting, and FWIW my 82mm without problems, I had put new Bosch O2 sensors (front only) before I started modding the car.

Denroll

I just ordered two from Amazon. $66 with free 2 day shipping (Prime!).