Val_809

iDle issues

Hello everyone,
Just so you know i have used the searched button | http://lmgtfy.com/?q=e55+rough+idle+ |

Idles rough when warm, and it hesitates at initial acceleration. It also bucks a little at low speeds with low rpms, this seems to trigger the rough idle

Two different diagnostics said that the throttle body was bad
-Replaced TB
Now the throttle response its better and it doesn't hesitates as often on initial acceleration and its smoother when down shifting down all gears

but the rough idle continues when warm
if i turn Off/On the car it goes back to smooth idle with the Check Engine light On

Check engine Codes:
P0507
P0106


Things that I’ve noticed:

*On the S/C Top Right Corner (Driver side) are two Fittings next to each other; one line plugged in, and the other is caped off.

*On the back of Driver side Air Intake Housing, I have what it looks to be a small Elbow Brass Barb Fitting with a hose attached that leads to nowhere.
I have Plugged that hose with a clamp and screw.


Things replaced:

Throttle body (New)
Intake Y-pipe seal
air filters
spark plugs NGK Iridium IX LFR7AIX (One step colder)
Bosch Premium Spark Plug Wire
Valve Cover Gasket Both sides
BOSCH Voltage Regulator
Johnson CM30 Pump
Gas Tank Cap
Transmission Mount

I have not done the Motor mounts yet.

Verified to the best of my ability:

Vacuum Leak hose Clamps on all hoses

I will post images of anything that can be helpful.

I just want to continue driving my beast without having her go crazy at stop lights.

shardul

iTrader: (1)

check your fuel pressure
80 to 85 psi at idle

Hotsauce55

MAP sensor? Try unplugging the line you plugged with a screw & clamp too

Val_809

shardul i would have to research on how to do it, but ill check on this. thanks

uraberg

Remove the supercharger belt (or check to see you can spin the drum separately from the pulley). If your supercharger runs at idle, chances are you'll get bucking, or rough idle, and MAP codes.


That hose from the intake goes to your driver's side valve cover, right under the filter housing.

jmb614

The spinning drum in your video is your supercharger, if it didn't spin I would be worried. It appears the hose you have clamped off goes to a surge tank, perhaps the previous owner had a sensor or nozzle installed there.

Like Shardul said, check the fuel pressure, one of your pictures has the fitting shown to check it.

Val_809

tested the pressure shardul

Val_809

For now I'm keeping that fitting on the surge tank caped off

Val_809

iDle Issues seams to have been fixed with the help of a member of Facebook: e55 amg place! w210 w211 page..


The attached picture is not my own but it was exactly what was disconnected on my SC. So it ended up being a Vacuum issue after all.

Thanks to everyone. your inputs where appreciated....

jmb614

Good find!

E55_MvP

Where does this hose connect to? Is it down under the surge tank somewhere?

GinDistiller

That one runs under the SC and back up front to either the secondary air valve or the vacuum connector (ambient air sensor I think?) next to it, on the passenger side by the supercharger magnet.