OM642 CPS adventure - Page 2 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #11 of 20 (permalink) Old 04-14-2019, 03:49 PM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,367
Mentioned: 2 Post(s)
Quoted: 265 Post(s)
(Thread Starter)
Received the cps and confirmed itís the latest generation.

Took the old one off (working under the car this time) and found it to be second generation and to be genuine MB.

I installed the new and was able to carefully note that it was seated properly and that the electric clip was engaged.

Proceeded to install the heat shield and dropped the bolt four times, but only found it three times. Itís an M6 bolt which is small.
Found a replacement at my local hardware.
Iím hoping itís use doesnít void any remaining warranty from MB, LOL.

Time will tell if this cures things.


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
Sponsored Links
Advertisement
 
post #12 of 20 (permalink) Old 04-15-2019, 01:32 PM
BenzWorld Junior Member
 
Date registered: Mar 2009
Vehicle: 2003 E500, 2008 ML320CDI
Location: Centerville UT
Posts: 39
Mentioned: 0 Post(s)
Quoted: 7 Post(s)
Have you ever noted the fuel level when you got the no-start condition? We experienced the exact symptoms you describe, but only when the fuel dropped below half tank. I solved the issue by replacing the in-tank fuel pump.
SkippyJasper likes this.
81willis is offline  
post #13 of 20 (permalink) Old 04-15-2019, 07:20 PM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,367
Mentioned: 2 Post(s)
Quoted: 265 Post(s)
(Thread Starter)
Thanks for your experience. I cannot, with confidence, say what the fuel level was when the events occurred.
Iíll start running it below half tank and see what happens.


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
Sponsored Links
Advertisement
 
post #14 of 20 (permalink) Old 04-16-2019, 10:21 AM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,367
Mentioned: 2 Post(s)
Quoted: 265 Post(s)
(Thread Starter)
81Willis,

What led you to suspect the fuel pump?

Skippy


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
post #15 of 20 (permalink) Old 04-16-2019, 11:55 AM
BenzWorld Junior Member
 
Date registered: Mar 2009
Vehicle: 2003 E500, 2008 ML320CDI
Location: Centerville UT
Posts: 39
Mentioned: 0 Post(s)
Quoted: 7 Post(s)
I bought the truck used and the people I bought it from had mentioned that it probably needed a fuel pump, apparently they had trouble with it and the dealer diagnosed it as a bad pump.
81willis is offline  
post #16 of 20 (permalink) Old 05-12-2019, 12:25 PM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,367
Mentioned: 2 Post(s)
Quoted: 265 Post(s)
(Thread Starter)
Today I had the same Ďcrank, no startí after a 10 mile trip. During the trip I stopped for a 10 minute time, restarted and after the second stop it was crank-no start.
Clearly the fuel pumps are not engaging when this happens. Successful restart after a 30 minute wait.
Yesterday I filled the tank and drove 100 miles or so with 3 stop/starts. No issues. I had allowed the tank to get below 1/2 with no starting issues.

Without reading through the whole thread this problem appears at random. The usual cure is to wait for Ďsomethingí to cool and then all is normal.

Iíve replaced the CPS twice and have the most current version installed.
Iíve replaced all of the relays under the hood as well as the fuel pump relay in the rear board.

Grounds have been taken apart, cleaned and put back together.

There are no codes and no MIL.

Ambient conditions were 50F and overcast.

In my mind the other items that may be involved are:
Fuel pump(s)
Rear fuse panel
Rear SAM (?) (I have checked the right rear well for water (none present) and have replaced the taillight gaskets. The original gaskets were attached to the tail light assemblyís, new ones are attached to the body).

Any thoughts on how to chase this down from here?

Skippy


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
post #17 of 20 (permalink) Old 05-12-2019, 02:40 PM
BenzWorld Member
 
CLKGroup's Avatar
 
Date registered: Jul 2009
Vehicle: 2008 ML 320CDI 4Matic, 2006 C350
Location: Florida & North Carolina
Posts: 246
Mentioned: 0 Post(s)
Quoted: 28 Post(s)
Skippy,

The only temperature related no - start I've had was on my CLK430. Once the CPS was replaced there were no further issues.

I did have an issue with the low pressure fuel pump (in the tank) on my ML. Had less than 1/2 tank of fuel and started up a hill when the engine started to die. Pulled off to a level location, waited at least 30 minutes, and it started right up. Drove directly to my MB Indy (former MB Master Tech) who told me the low pressure pumps have been an issue on my ML. Had them replace the pump and have had no further issues with low fuel and going up hills for the past 16,000 miles.

Hope you sort your problem out as I know it can be frustrating.

2008 ML 320CDI, 4Matic, P2, Iridium Silver, Ash MB-Tex
CLKGroup is offline  
post #18 of 20 (permalink) Old 05-12-2019, 04:46 PM
Outstanding Contributor
SDS Guru
 
Deplore's Avatar
 
Date registered: Apr 2014
Vehicle: 1998 MB E300TD, 1997 MB E320
Location: LA, CA
Posts: 3,083
Mentioned: 117 Post(s)
Quoted: 735 Post(s)
Do you have SDS? Take it with you and when you get one of those crank no start, check the live data in the ECU.

You're looking for three things -- exhaust backpressure, lpfp pressure, and hpfp pressure.

Exhaust backpressure is supposed to be within 10 hpa from the MAF and charge air pressure. If it is over that, the car will start....sometimes. If it is WAY over that, no start at all. Common problem on 642. Faulty sensor typically reads high. I've seen exhaust temperature read 1100F....in a stone cold engine. No start. Replacing the bp sensor repaired the no start.

Second, you're looking for lpfp pressure -- 4 to 6 bar is nominal.

Third, hpfp pressure sensor reads between 200-1600 bar. 250 bar is the minimum required to start the car.

lpfp failure can cause no start, but relatively uncommon in bluetec unless dirty diesel. Can measure this with a gauge by putting a t-line in the fuel filter on top of engine and crank the car. Also can do a flow test, actuating the pump with SDS or similar device, the pump is supposed to fill a 500ml bottle in 9 seconds or less. The flow should be smooth, no aeration or splurts.

--1998 MB E300TD 291k
--1997 MB E36 Frankenstein'd AMG 199k
--2011 Suzuki DL650 58k
--1997 MB E320 161k. SOLD...loved that stupid car.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

--1997 MB C36 AMG 273k -- stripped and junked

Last edited by Deplore; 05-12-2019 at 04:50 PM.
Deplore is online now  
post #19 of 20 (permalink) Old 05-12-2019, 06:03 PM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,367
Mentioned: 2 Post(s)
Quoted: 265 Post(s)
(Thread Starter)
Deplore,

I have Carsoft MBII which will show those items (I think).

If Iím understanding things, the back pressure sensor can report excessive readings which causes the no-start condition.

Iím musing that the 10 mile or so distance might have placed the car in a regen mode with resulting high temps. On my W211 it was easy to hear the exhaust crackling if I shut it off during regen. This vehicle not so much.

Iíll see what happens next time.

Skippy


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
post #20 of 20 (permalink) Old 05-12-2019, 06:04 PM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,367
Mentioned: 2 Post(s)
Quoted: 265 Post(s)
(Thread Starter)
CLKGroup,

Thanks for your experience. It is annoying to say the least.
Less annoying when itís daytime and the weather is fine though.

Skippy


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Vans/Trucks/SUV/Others > W164 M-Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome