PEASE HELP A NEWBIE ml problem

[ml270]

im new here so first off i would like to say hi to you all
i have a 2000 ml 270 cdi
it loses power very intermitantly and will not rev above 3000rpm(seems like get home safe mode).if i turn ignition off and restart engine it will be fine for a while .i have read as many threads as i can find on this and they all seem to point to the maf. so i changed this and the problem still persists. i changed it again for a pierburgh one that was fitted originally by merc.however this problem still persists.im sure some one out there must have the answer please please help it drivin me crazy
br
ml270
ps i have also had it on diagnostics but it shows nothing to be at fault

 

[JEZ.S320L]

im new here so first off i would like to say hi to you all
i have a 2000 ml 270 cdi
it loses power very intermitantly and will not rev above 3000rpm(seems like get home safe mode).if i turn ignition off and restart engine it will be fine for a while .i have read as many threads as i can find on this and they all seem to point to the maf. so i changed this and the problem still persists. i changed it again for a pierburgh one that was fitted originally by merc.however this problem still persists.im sure some one out there must have the answer please please help it drivin me crazy
br
ml270
ps i have also had it on diagnostics but it shows nothing to be at fault

1st of all - welcome.

Someone will be along very soon, who will be able to help you.

I can't - because I don't know. Sorry.

 

[ml270]

thankyou for your welcome
fingers crossed someone can help
br
ml270

 

[Ellsy Tanners]

Hello, There are many possible cause,s for this. One possibility is a leak in the charge air track, commanly a hose or intercooler, have some rev the engine while you, look listen for sounds/signs of a leak. whoosing air or oil residue from the area.

start here as its something you can have a go at urself

 

[ml270]

thank you i will try this in the morning
will post with progress after i have tryed this
any more help would be appreciated
br
ml270

 

[hampshire jock]

I had this issue as well.
wasnt the MAF but diagnostics did show a turbo pressure inlet problem.
I changed the turbo inlet pressure transducer - the wee cylinder that has 2 small pipes attached to it and a small air filter below and is located next to air inlet on the drivers side at the front.

more people will beable to describe it more technically - however it worked.

i can tell you the part number if you need it - but that will be tomorrow.

good luck

 

[television]

One non fault code storing is loosing power and black smoke from exhaust
= clean air cartridge , make sure that the injectors have a gasket, remove air charge pipe and clean.

If the engine is 611 and the control unit is without code 800 replace the control unit

Electric Actuator defective, check fuse in control unit or replace actuator lever

611 150 03 94 Electric actutor
611 098 02 26 lever link modified
611 098 01 26 lever safety clip

Best that I ca come up with

 

[ml270]

I had this issue as well.
wasnt the MAF but diagnostics did show a turbo pressure inlet problem.
I changed the turbo inlet pressure transducer - the wee cylinder that has 2 small pipes attached to it and a small air filter below and is located next to air inlet on the drivers side at the front.

more people will beable to describe it more technically - however it worked.

i can tell you the part number if you need it - but that will be tomorrow.

good luck

thank you could you please send me that part number
and thank you all others for your help i will try today
br
ml270
p.s
any more ideas just in case?

 

[DJH]

I had this problem on my C220 cdi w202 (2000) at 60,000 miles.It had happened on various occasions before from around 25000 miles.The problem being loss of power-max 2800-3000 rpm-problem resolved after stopping turning off engine for 60 secs + and restarting.It then became more frequent and at around 60000 was permament after 10 mins running.
(I note this info for information to other forum members)
I will list the following of what action I took after checking forum posts.(The car had always had main dealer service on comp. indicated periods in my case 3)
I changed air filter it was clogged&Fuel filter partially clogged.
Cleaned MAF
Initially car ran ok fault returned.
Changed MAF for Pierburgh replacement from Europarts £46 approx.Noticed EGR valve was seized.I managed to free actuater&valve with wd40 and a liberal coating of coma copperslip high temp. "grease".Initally car ran ok but fault returned,I then cleaned and made sure MAF contacts made sound connection.
I was commited to drive the car to Spain shortly following this work and after 100 miles of running perfectly the fault reappeared.
I stopped turned the engine off,restarted and this fault has not reoccured.I have now covered 67500 MILES with 2 trips of approx. 3000 miles.Did the management system need to learn the new sensor?
It may be of interest but I have relubricated EGR and it seems fine.

 

[DJH]

I had this problem on my C220 cdi w202 (2000) at 60,000 miles.It had happened on various occasions before from around 25000 miles.The problem being loss of power-max 2800-3000 rpm-problem resolved after stopping turning off engine for 60 secs + and restarting.It then became more frequent and at around 60000 was permament after 10 mins running.
(I note this info for information to other forum members)
I will list the following of what action I took after checking forum posts.(The car had always had main dealer service on comp. indicated periods in my case 3)
I changed air filter it was clogged&Fuel filter partially clogged.
Cleaned MAF
Initially car ran ok fault returned.
Changed MAF for Pierburgh replacement from Europarts £46 approx.Noticed EGR valve was seized.I managed to free actuater&valve with wd40 and a liberal coating of coma copperslip high temp. "grease".Initally car ran ok but fault returned,I then cleaned and made sure MAF contacts made sound connection.
I was commited to drive the car to Spain shortly following this work and after 100 miles of running perfectly the fault reappeared.
I stopped turned the engine off,restarted and this fault has not reoccured.I have now covered 67500 MILES with 2 trips of approx. 3000 miles.Did the management system need to learn the new sensor?
It may be of interest but I have relubricated EGR and it seems fine.

On reviewing this post, I must make clear, when MAF is stated I mean the mas air sensor.I understand this to be the sensor that supplies information to the engine management system on the air supply to the engine.
[Please inform me of contrary]

 

[kebo57]

Hi & welcome
How long have you owned this motor
How long have you had this problem
How many miles has your motor done
What were you doing with the motor, leading up to this problem
You say "it loses power very intermittently" is there a pattern to the rev lock down situation
There are some very knowledgeable people on this forum & I think this can be sorted out there cant be much wrong if you stop & restart and its OK for a while I will look for your reply tomorrow

Kevin
PS you dont say your location

 

[ml270]

Hi & welcome
How long have you owned this motor
How long have you had this problem
How many miles has your motor done
What were you doing with the motor, leading up to this problem
You say "it loses power very intermittently" is there a pattern to the rev lock down situation
There are some very knowledgeable people on this forum & I think this can be sorted out there cant be much wrong if you stop & restart and its OK for a while I will look for your reply tomorrow

Kevin
PS you dont say your location

thank you for your welcome
and every one else for there help
i have owned the car a few months and the problem was almost instant(within a week)the only pattern that seems to have formed is it always happens when going up a slight gradient and always when the engine is about to change gear
but not every time i go up hill
since changing the air flow sencor(maf) the problem occurs less often but is stil there
at first it happened every few days but now every day
thankyou all for your help
heres hopin
br
ml270
location birmingham uk 90000 miles

 

[kebo57]

Hi you say
"ps i have also had it on diagnostics but it shows nothing to be at fault"

If your motor is giong in to limp mode then I would expect this to show up with diagnostics check, Im just wondering where you got this done

Is you motor a auto

Kevin

 

[ml270]

hi
i agree this would show i took the car to a local garage and it showed nothing so i took it in to the local merc garage and still nothing
any more ideas???? and yes its auto

 

[kebo57]

hi
i agree this would show i took the car to a local garage and it showed nothing so i took it in to the local merc garage and still nothing
any more ideas???? and yes its auto

Hi I know this will sound daft but have you changed the gear box oil & filter, its an easy job

You say your motor have done 90K so it wont be a waste of money if you do this and it doesn't make any difference

I have a slight hesitation but no limp mode when accelerating over 70 mph & when I changed the gear box oil & filter it all most disappeared

Kevin

 

[mgordon@assuretech.co.uk]

Im just having the same problem cured. First of all found that one injector was badly leaking so work was scheduled for following week. In the meantime diagnostics showed MAF to be reading wildly over. This was replaced and faults cleared. Problem returned almost immediately. Injector was replaced - engine ran much smoother and mouch more power but still fell back pretty quickly into Limp-Home mode.

Guys at Merparts in Port Glasgow suggested manifold EGR valves sticky and upon opening up found that 4 out of 5 butterfly valves were not clsoing down properly and one valve had been dislodged completely - luckily not falling into cylinder.

The bill is going to be painfull but im now hopeful that the cause has been found...although Imn now pretty upset at finding this nice vehicle I bought probably hasnt been looked after as well as I thought.

I would think that the manifold could have been inspected for sludge and oil with a fibre optic camera thingy....

 

[mgordon@assuretech.co.uk]

Update to my last post - manifold and motor replacement has not cured the issue. Could someone who knows maybe list (All?) the possible causes of Limp Home Mode so we can all go through them one by one..just a thought since everyone seems to point to the MAF which Ive already replaced and it seems a lot of people have similar trouble even after MAF is replaced.....

 

[mgordon@assuretech.co.uk]

ML270 limp home mode

Took off cover and found the air tube to EGR valve disconnected. REplaced and road tested. Boost now comes on a treat - all working - finally.

 

[ernieh]

ML Limp Home Mode

Hi,
Do you think this was the problem all along or was it something that happened as a result of the work carried out? It might be worth trying to find out with a view to recovering some of your hard-earned!

Ernie

 

[kebo57]

manifold and servo motor replacement has not cured the issue. .....

[/QUOTE]Took off cover and found the air tube to EGR valve disconnected. REplaced and road tested. Boost now comes on a treat - all working - finally. . .....[/QUOTE]

I'm glad you sorted the problem
Regarding this (air tube to EGR valve) to replace the manifold and servo motor the air tube would have been disconected when the EGR valve was removed so why not reconected, if one was capable of replaceing the inlet manifold you would think this wouldn't be left off.
Now I wondering if this pipe was of before the manifold and motor replacement

I have removed the inlet manifold on my ML 270 & done a slight repaire to the swerl flap / butterflies operating rail cleaned & decoked the inlet ports, swerl flap, inlet manifold, EGR valve, all be it not much use to you now
I have pictures of the whole procedure I could PM them to you
Kevin
PS Iv'e managed to upload this one Inlet manifold with servo motor