Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-21-2018, 07:36 PM
nyko46's Avatar
Registered User
 
Join Date: Jan 2004
Location: Rowlett - Texas - USA
Posts: 393
Question 2008 E320 Bluetec Harsh Gear Shift

My 2008 Mercedes Benz E320 Bluetec with 97K miles is giving me a NOT happy harsh down gear shift and also up gear shift specially when reducing speed just before stop in a traffic light and just after taking off from traffic light.
This harsh gear shift makes no noise but cause the car to jump back and forward when it happens. The engine light came on just before it started to be noticed. Also from time to time the engine's RPM does not increase when the accelerator is pressed down as it was before.
About engine RPM this week I had time when it responded to the accelerator and in the same week times when it did not responded to the accelerator.
I have the car not yet scanned for the engine light due the work schedule but I will have it done today, Friday 10/19/18.
Driving to and from work, a trip of 27 miles each way in a highway, I have no problem with speed or gear shifting. All run normal, no noise, nothing noticeable except engine RPM when, in purpose, I press hard the accelerator.
About gear shift I have read couple cases on the Internet but did not find anything about Diesel engines. All of them are about Gasoline engines which, I believe, have different transmission. If I am no wrong this car has a 6 speed automatic transmission.
I will be glad having your input and suggestion about this issue.
I will also update this thread after having the car scanned.
UPDATE: Auto Zone scanner gave me two codes: P-0471 and P-2015
P0471: Exhaust Pressure Sensor Range/Performance
P2015: Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 1
Also, if it helps, the last job performed on this car was a fuel filter replacement in which a removal of the air intake ducts are necessary.
Does it have something related with the issues on this car?
Thanks for your reply.
__________________
Nyck - TX - USA

Last edited by nyko46; 10-21-2018 at 08:17 PM. Reason: Update
Reply With Quote
  #2  
Old 10-21-2018, 08:23 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,759
Check the transmission fluid level or have it checked. I’m pretty sure it’s a 722.9 7-speed automatic.

Sixto
98 E320s sedan and wagon
02 C320 wagon
Reply With Quote
  #3  
Old 10-21-2018, 08:30 PM
nyko46's Avatar
Registered User
 
Join Date: Jan 2004
Location: Rowlett - Texas - USA
Posts: 393
About be 6 or 7 speed, the + and - signs at the transmission lever show up to number 6 when moving to +. Does it say anything about number of gears? Thanks
__________________
Nyck - TX - USA
Reply With Quote
  #4  
Old 10-22-2018, 02:11 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,759
It will go from 1 to 6 then to D. That’s 7 forward speeds.

Sixto
98 E320s sedan and wagon
02 C320 wagon
Reply With Quote
  #5  
Old 10-22-2018, 06:11 AM
engatwork's Avatar
busy
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,162
Any maintenance history on it? I've seen shift quality change for the worse when the wrong fluid was used.
__________________
Jim
Reply With Quote
  #6  
Old 10-22-2018, 10:36 AM
jay_bob's Avatar
Control Freak
 
Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,338
We have the same car, and I also have a ML320 of the same year with the same engine and transmission. And a 2014 ML350 with the later versions of the OM642 and 722.9.

You have the first generation 7 speed 722.9 transmission. This does take special ATF. Note there are two fluids for the 722.9, you have the earlier model that takes the special "red" fluid not the special "blue" fluid.

P2015 I am reasonably sure that is your swirl flap motor. Temporarily do this to see if this is your problem. Find the swirl flap motor, it is just behind and below the fuel filter. You will probably have to remove the intake Y-pipe to see it. It is a black box that is sitting in the V. Follow the cable from the motor to a 4 pin connector in the neighborhood of the fuel filter. Unplug the connector and on the vehicle side of the plug take a 4.7 k ohm resistor, bend the leads and stick into the two center pin sockets. Cover with electrical tape to ensure no shorts. See if that clears your light, if so, your swirl flap motor is shot. Don't leave it like this, your bad performance will continue until it's fixed.

P0471 up under the car you will see the DPF. There are several sensors screwed into the pipe with electrical cables, these are oxygen and temperature sensors. You will also see two 1/4 inch tubes coming off the DPF, that transition to rubber lines, and go to a sensor box mounted somewhere out of the way (on the E320 I haven't been looking down there, I know where it is on the ML) under the car above the filter. This is your exhaust pressure sensor. It looks at the difference in pressure across the DPF to know when to regen and also if it is getting clogged. I am pretty sure this is the sensor they are talking about, when I took apart the ML to change the oil cooler seals I had to remove the exhaust leader from the turbo to the cat and there are no other pressure sensors upstream of the DPF.

Xentry is your friend with these cars. Best money I ever spent (for a bootleg on eBay) having 4 computer controlled diesels, it has paid for itself many times over. Not only does it tell you exactly what the problem is, the error log is hyperlinked right to the procedure to fix it.

I can also recommend once you get these 2 issues sorted then have a visit to the dealer, pay for an hour of shop time, and have them do the ECU and VGS firmware updates that are out there for the 642 and 722.9. Makes a huge difference in the upshift/downshift behavior. Unfortunately you can't do these with a bootleg computer since it has to authenticate to Germany to load firmware.

Also have them clean out all the cobwebs in the fault history (these things store an event if you fart in the seat) so you have a baseline. These won't show up on generic OBDII scanners.
__________________
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older son's college DD)
2008 E320 Bluetec (Younger son's college DD)

1987 300TD sold to vstech
----------
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
Reply With Quote
  #7  
Old 10-22-2018, 08:11 PM
nyko46's Avatar
Registered User
 
Join Date: Jan 2004
Location: Rowlett - Texas - USA
Posts: 393
I have this car for only 6 months and the historic that I have is the oil change.
The only thing that I did was change the fuel filter. Filter only not the water level sensor.
There are Mercedes mechanics that say that the water level sensor on top of the fuel filter MUST be replaced when changing fuel filter otherwise it causes problems similar to this one.
__________________
Nyck - TX - USA
Reply With Quote
  #8  
Old 11-02-2018, 11:45 AM
nyko46's Avatar
Registered User
 
Join Date: Jan 2004
Location: Rowlett - Texas - USA
Posts: 393
Question Harsh Transmission Shift Issue Resolved

About the posted issue with harsh transmission shift and no acceleration I had to bring the car to a specialized and fully equipped Mercedes Benz shop.
They diagnosed the car and found 18 old codes and 2 new codes and from there they worked to resolve the problem that was going on: no acceleration and transmission harsh gear shifting.
The diagnostic showed a NOT working Intake Manifold Actuator.
They disassembled everything including a removal of the turbo in order to get access to this part and had it replaced for a OEM part.
They reassembled using new o rings, gaskets, and other parts all OEM parts.
Mechanic told me that the harsh shift was related with manifold not working at all and consequentially confusing the computer when to shift and when not to shift. After repair the car worked fantastically getting back acceleration and engine power. Transmission works very good in all gears no having anymore harsh shifts.
"Technically speaking" he said " it was an electronic issue because air intake manifold is a electric device controlled by the car computer".
In TEXAS the total cost of the repair was $ 1160.00 with parts, labor and taxes. The parts only was $ 450.00 for OEM parts and the remaining for labor and taxes. They give a one year or 12 months warranty.
I thank everyone that sent me a reply related to this issue. It was very appreciated.
Believing that it can help someone I decided to post how issue was resolved.
__________________
Nyck - TX - USA
Reply With Quote
  #9  
Old 11-02-2018, 01:25 PM
gsxr's Avatar
Unbanned...?
 
Join Date: Aug 2001
Location: USA
Posts: 8,002
Glad to hear your shifting issue is resolved! That's good news.

However... if the fluid & filter has never been changed (or, you have no record of it).... I'd highly recommend that with 100kmi on the clock. These transmissions are not "filled for life". The "special" ATF is not that special, it's 236.14 spec, and Red Line D6 works just fine. Newer models that require the blue 236.15 fluid are a different story.

__________________
Dave M.
Boise, ID

1997 E420 - 155kmi (Bugeyes)
1994 E420 - 145kmi (Blondie)
1993 500E - 193kmi (Lollipop)
1992 400E - 189kmi (Stinky Dirty)
Check out my website photos, documents, and movies!
Reply With Quote
  #10  
Old 11-03-2018, 10:42 PM
nyko46's Avatar
Registered User
 
Join Date: Jan 2004
Location: Rowlett - Texas - USA
Posts: 393
Thanks for your recommendation about the ATF change.
I think this was a very good tip.
__________________
Nyck - TX - USA
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 12:14 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page