W211 220cdi fuel pressure

SHAMGIT

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My 58 reg with 230000 miles has a problem.
Car drives perfectly will cruise all day at 70.put her under pressure
try exelerating hard from 70 up a hill and she goes into limp mode.pull over turn of for a minute and it clears
code reader said low fuel pressure
.I have replaced the fuel rail twice with used parts they come from the breakers complete with sensors on either end
.and it has not cured it so the 3 rails must be okay
.would you say my next port of call is one of the fuel pumps.
My code reader is the icarsoft.

Any help would be appreciated
 

mersum1es

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wasn't there a thread 'my car goes limp what to do'..?
Stop throwing money to parts, Change fuel filter if not changed, Diagnose your injectors (leak test, correction values), then hp pump and quantity valve test (Can magnificent carsoft do that?).
 

alexanderfoti

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Is it going into limp or is it cutting out completely? As mersum1es don't keep guessing.

Fuel pressure drops when either the supply cannot be maintained, or when it leaks off (via bad injectors eg).

I have never seen a rail cause bad fuel pressure.

Its either supply to the HP pump (filter blocked, pipes etc.) or worn injectors are the 2 most likely.
 

Steve@Avantgarde

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Find it hard to believe a fuel pressure fault sends the car into limp mode. I would think more the engine would cut out, if the engine sees a low fuel pressure (150bar or less) the ECU will cut the engine anyway because it assumes a fuel leak or high fuel usage.

I don't think I've ever seen a fuel pressure fault send an engine to limp mode.
 
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SHAMGIT

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Thanks all for replies
Maybe it's not classed as limp.
Car is driving normal until being asked for a bit extra over 70mph
If going up a hill and foot is going to floor that is when engine warning light comes on.
Once over hill car will still cruise at 70mph. But no kick down which I very rarely use.
Mercedes wanted an arm and a leg for a fuel rail complete with its sensers. Breakers always sell complete rail and sensors
Have tried 2 used ones that must be ok because problem is still there .next step is fuel filter.

I will keep updating until problem cured
Thanks.
 

alexanderfoti

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What codes are being logged?
 

Westheath

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As already said, any fuel pressure drop would cut the engine and not induce a limp mode.

You are chasing a code as a by product of another fault imho.

More likely a Charge Pressure error.









.
 

mersum1es

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Good heads up there, me neither heard fuel pressure limp... didn't think and read carefully enough... time for SDS session it seems...
 
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SHAMGIT

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Thanks all for input.
New fuel filter fitted still driving normal unless asking for extra over 70mph so still got problem.
Next step is to check injectors
Will put code reader on and try and give more info and get back to you.
When it goes bad if i don't stop and pull the key for a minute I can drop my speed down to 40.I can slowly get it back up to 70 but no kick down
 
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SHAMGIT

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Icarsoft codes are

22e7000 rail pressure is to low

22e7005 rail pressure via quantity control valve to high.

221b low/high rail pressure to low on start up

2054.000 AD converter of control modal n3/9 (cdi control unit) faulty .
-----------------
First time i have seen this one
2054.007 short circuit to positive or open circuit to component b50 fuel temp sensor
 

Smyrnian

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Thanks all for input.
New fuel filter fitted still driving normal unless asking for extra over 70mph so still got problem.
Next step is to check injectors
Will put code reader on and try and give more info and get back to you.
When it goes bad if i don't stop and pull the key for a minute I can drop my speed down to 40.I can slowly get it back up to 70 but no kick down

Hi SHAMGIT

I have w211 2008 280cdi, same thing happened to me last night, so I'd be interested what remedy you find for your car. Keep us updated please...
 
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SHAMGIT

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Fitted new fuel temp sensor.
No change.
Think I have made a complete pigs earole of this
.doing everything back to front
.next step is injector test.
Should have gone to an independent and got it on star.

Would star have come up with it first time or would it have come up with the same stuff that icarsoft did which was pressure control valve.
Had same problem my previous w211 it came up with PCV .
I changed the rail and it cured it
 

alexanderfoti

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Fitted new fuel temp sensor.
No change.
Think I have made a complete pigs earole of this
.doing everything back to front
.next step is injector test.
Should have gone to an independent and got it on star.

Would star have come up with it first time or would it have come up with the same stuff that icarsoft did which was pressure control valve.
Had same problem my previous w211 it came up with PCV .
I changed the rail and it cured it

Star will tell you what the codes mean, and will assist you in running tests to rule out other items.

Star will also show you the correction values, which will tell you if its heavily compensating for one injector, which is most likely the one which high leak off.

A leak off test will tell you which injector is leaking off, and is most likely the cause :)
 
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SHAMGIT

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Leak off test done .
everything okay.
Would star have told me if turbo was the problem.
is my icar soft trying to confuse me.
when I do a fault check with it.
it comes up every time with low rail pressure.
when I use OBD2 on icar soft it comes up with high rail pressure. which if any is it going to be.
The reason I ask about turbo is when all this started and it first went into limp codes were saying low rail pressure but now limp is taking place every time I kick it down from about 30mph
it has got worse over the last couple of weeks and am now getting a rattle at 2500 to 3500 revs when I kick it down.
as soon as I hear it I lift off and it's gone but that is when it goes into limp .would star show turbo problem.
Has anyone ever had codes on icar soft which are to do with turbo
Look forward to any replies.
Even those that say I'm an ideot and I should get it on star.
 

John Laidlaw

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Star is certainly far more reaching and comprehensive for sure- maybe just book it in for a session with
https://www.rhautoservices.co.uk/
On your doorstep and Richard will be helpful....
(Would never use the idiot word unless you’ve an AMG badge stuck on your car!)
 
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SHAMGIT

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Am getting close now.

Have taken in all your advise.
Didn't want to go on star as that is when costs can esculate.
It won't pin point but will advise.
Problem with me is it becomes a challenge.
Sometimes I put 2 and 2 together and invariably come up with 3.
My little man who has looked after my last 4 mercs over a period of 18 years and charges me pea nuts didn't have an injector leak off test kit so he ordered one from china which took a couple of weeks to arrive. A very nice box set costing a mere £20.
I have in the meantime spent the last 4 weeks coughing with bronchitis so I wasn't in a rush to fix it and it was still driveable.
Some time ago I had a replacement rail complete with sensors fitted which sorted out the exact same problem with the same
Fault code...rail pressure low...
Because it once again was pointing me in the same direction I fitted another rail.
It didn't fix the problem but it did eliminate the rail and sensors.
We fitted new fuel filter and checked lift pump..
4 months ago I got wife a w211 220cdi on a 57 plate.
Swapped over all sensors and high pressure pump no change so they must be all good.
Little man with his new kit did leak of test all injectors were showing the same level
Carried on racking my brains.not many cells left in there.
Couple of days later I checked with him how he had done the test.
He had done it at tick over.
He did another one
and held it at 3000 revs..number 4 tube filled up with the others staying level.
That explained why car was driving normally at up to 40mph
Up to now the moral of the story is do the cheapest first I .E. ...filter and leak of test first..

I will update next week when injector is changed
 
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SHAMGIT

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Star is certainly far more reaching and comprehensive for sure- maybe just book it in for a session with
https://www.rhautoservices.co.uk/
On your doorstep and Richard will be helpful....
(Would never use the idiot word unless you’ve an AMG badge stuck on your car!)

Thanks shipmate will be visiting Richard in the near future to check out comand on my newly aquired w212 220cdi ..16reg 1 owner lease company
It's a ce estate in silver with 106000 miles.think I got a good buy at £13600.
 

Steve@Avantgarde

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Am getting close now.

Have taken in all your advise.
Didn't want to go on star as that is when costs can esculate.
It won't pin point but will advise.
Problem with me is it becomes a challenge.
Sometimes I put 2 and 2 together and invariably come up with 3.
My little man who has looked after my last 4 mercs over a period of 18 years and charges me pea nuts didn't have an injector leak off test kit so he ordered one from china which took a couple of weeks to arrive. A very nice box set costing a mere £20.
I have in the meantime spent the last 4 weeks coughing with bronchitis so I wasn't in a rush to fix it and it was still driveable.
Some time ago I had a replacement rail complete with sensors fitted which sorted out the exact same problem with the same
Fault code...rail pressure low...
Because it once again was pointing me in the same direction I fitted another rail.
It didn't fix the problem but it did eliminate the rail and sensors.
We fitted new fuel filter and checked lift pump..
4 months ago I got wife a w211 220cdi on a 57 plate.
Swapped over all sensors and high pressure pump no change so they must be all good.
Little man with his new kit did leak of test all injectors were showing the same level
Carried on racking my brains.not many cells left in there.
Couple of days later I checked with him how he had done the test.
He had done it at tick over.
He did another one
and held it at 3000 revs..number 4 tube filled up with the others staying level.
That explained why car was driving normally at up to 40mph
Up to now the moral of the story is do the cheapest first I .E. ...filter and leak of test first..

I will update next week when injector is changed

I find it mad and puzzling that you don't want to pay an Indie for an hours work for a session on star which you will pinpoint the fault to the failed component and yet Fred in shed who doesnt even have a leak off kit, and thus, probably no knowledge of modern CDI diagnosis who just throws bits at the engine and wastes time swapping bits from one car to another in complete guess work you find more cost and time effective....???

Absolute madness IMO....
 
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