no boost in the intake of 98' E250TD

[poisas]

Hi guys, hopefully you can give me some advise here,
got 4eyed mercedes with 2.5 turbodiesel engine 110kW,
i have a terrible consumption for a moment, i did refill, got 350km and filed in 42l of diesel.. equals 12l/100km. I got this car not so long ago,
so now i try to investigate as much as i can, i did check on a EGR valve, in service they said that they fixed it, but it almost feels like nothing, i notice some vacuum system near the turbo modifications.
i have no smoke at all totaly, and also no perfomance, i kick the floor, and i have to wait until 2500rpm, then I hear turbo comes with sound like "ssszszszszszszsssszzz" about 3200rpm it slows down and you can sleep until it reaches 4500rpm, , then i try to see how much turbo presure i have in the intake, and OMG i sqeeze the intake rubber part, near the intake manifold, and it almost feels like nothing ... no boost, no shhhh sound under the hud aswell.. in the service they ensured that everything is OK fine no problem at all. Engine sounds great as we say if we can put a glas of water on it and it stays with no flicking, than the engine works fine ok i realy hear the sound of turbo at about 1800rpm.
now is the question, how much presure should i have ?, i tryed the same thing on a bmw 525tds 98' yeah.. i even didn't have to tuch the rubber intake hose, its possible to see with naked eye that its expanding from the pressure like a baloon; same thing on a 1995' VW golf3 1.9TDI 66kW,
Now i have a headaake how to check if the all intake housing is hermetical, and the presure is not leaking.. Maybe I'm wrong ? maybe that stupid Garret Turbo GT25 does this little pressure like my grandmothers ass does ?

 

[Dieselman]

Having not been near your Grandmothers Ass I really don't know about that but the car should generate 1 Bar at 3000rpm when under full load.

You can only measure boost when driving th ecar as it won't make any discernable amount at low load conditons.

Fit a pressure gauge T'd into the MAP sensor line to measure the boost.

You should be able to see whether the wastegate actuator is loose or tight at idle conditions. If it's loose then the ECU is in limp home mode or the vacuum modulator is not working.
Swap the modulator with the EGR modulator as a test.

I don't think your car monitors EGR so that can be blocked which may help.

As there is no visible smoke at all suspect eh MAP sensor to not be reading the boost pressure so not fuelling up accordingly.

 

[fredfloggle]

Hi guys, hopefully you can give me some advise here,
got 4eyed mercedes with 2.5 turbodiesel engine 110kW,
i have a terrible consumption for a moment, i did refill, got 350km and filed in 42l of diesel.. equals 12l/100km. I got this car not so long ago,
so now i try to investigate as much as i can, i did check on a EGR valve, in service they said that they fixed it, but it almost feels like nothing, i notice some vacuum system near the turbo modifications.
i have no smoke at all totaly, and also no perfomance, i kick the floor, and i have to wait until 2500rpm, then I hear turbo comes with sound like "ssszszszszszszsssszzz" about 3200rpm it slows down and you can sleep until it reaches 4500rpm, , then i try to see how much turbo presure i have in the intake, and OMG i sqeeze the intake rubber part, near the intake manifold, and it almost feels like nothing ... no boost, no shhhh sound under the hud aswell.. in the service they ensured that everything is OK fine no problem at all. Engine sounds great as we say if we can put a glas of water on it and it stays with no flicking, than the engine works fine ok i realy hear the sound of turbo at about 1800rpm.
now is the question, how much presure should i have ?, i tryed the same thing on a bmw 525tds 98' yeah.. i even didn't have to tuch the rubber intake hose, its possible to see with naked eye that its expanding from the pressure like a baloon; same thing on a 1995' VW golf3 1.9TDI 66kW,
Now i have a headaake how to check if the all intake housing is hermetical, and the presure is not leaking.. Maybe I'm wrong ? maybe that stupid Garret Turbo GT25 does this little pressure like my grandmothers ass does ?

Disconnect the MAF and keep you bowels open-

No, don't do that - blocked CAT. My pipe expanded too, with an asthmatic fssing sound. A two pound hammer and I bashed it, no trouble since.

 

[fredfloggle]

Having not been near your Grandmothers Ass I really don't know about that but the car should generate 1 Bar at 3000rpm when under full load.

You can only measure boost when driving th ecar as it won't make any discernable amount at low load conditons.

Fit a pressure gauge T'd into the MAP sensor line to measure the boost.

You should be able to see whether the wastegate actuator is loose or tight at idle conditions. If it's loose then the ECU is in limp home mode or the vacuum modulator is not working.
Swap the modulator with the EGR modulator as a test.

I don't think your car monitors EGR so that can be blocked which may help.

As there is no visible smoke at all suspect eh MAP sensor to not be reading the boost pressure so not fuelling up accordingly.

Not that simple it is 'O' ringed in, but if if is seeing boost without load (bulging pipes - oh how I know what he is feeling) then his intercooler pipes are OK and not split. After a while he will notice a bit of soot out of the actuator spindle.

 

[poisas]

Disconnect the MAF and keep you bowels open-

No, don't do that - blocked CAT. My pipe expanded too, with an asthmatic fssing sound. A two pound hammer and I bashed it, no trouble since.

sorry no such MAF sensor in my car..

 

[fredfloggle]

I reckon your pipe is bunged up.

You say your pipe went "ssszszszszszszsssszzz"

But mine went "ssszszszszszsffszfsssszzz"

Joking aside, it makes a sort of constipated wheezing noise?

 

[Dieselman]

And what's 'O' ringed. Not his Grandmothers ass, I hope..

 

[Dieselman]

If you mean the MAP sensor being plugged in then it's on a remote hose on the inner wing. Common failure.

 

[poisas]

about that wastegate acuator, sory that i'm stupid, but how to see that if its loose or not ? got any images on the web ?
http://www.mbclub.lt/components/com_joomlaboard/uploaded/images/PA280064.JPG
http://www.mbclub.lt/components/com_joomlaboard/uploaded/images/PA280065.JPG

you can see here where that wastegate actuator is ?
if i understand corectly, that boost comes only then, when i have speed, so no point in looking for presure in that harmonical hose by standing by myself in the front of car.

about presure gauge,
so i have to make some "T" conection in that smal pipe "manifold-> MAP"
and conect a pressure gauge, and drive a car, and expect about 1bar presure at 3000rpm.

Having not been near your Grandmothers Ass I really don't know about that but the car should generate 1 Bar at 3000rpm when under full load.

You can only measure boost when driving th ecar as it won't make any discernable amount at low load conditons.

Fit a pressure gauge T'd into the MAP sensor line to measure the boost.

You should be able to see whether the wastegate actuator is loose or tight at idle conditions. If it's loose then the ECU is in limp home mode or the vacuum modulator is not working.
Swap the modulator with the EGR modulator as a test.

I don't think your car monitors EGR so that can be blocked which may help.

As there is no visible smoke at all suspect eh MAP sensor to not be reading the boost pressure so not fuelling up accordingly.

 

[Dieselman]

about that wastegate acuator, sory that i'm stupid, but how to see that if its loose or not ? got any images on the web ?
http://www.mbclub.lt/components/com_joomlaboard/uploaded/images/PA280064.JPG
http://www.mbclub.lt/components/com_joomlaboard/uploaded/images/PA280065.JPG

That's the EGR actuator pipe, not the turbo.

The turbo actuator is underneath. While the engine is running the link rod should be taught. If it's slack then it's been released for soem reason as a fail safe.

On the opposite inner wing there should be a MAP sensor on a small pressure line. T into this line.

 

[poisas]

the turbo wastegate actuator is underneath the turbo ?

sory for my english, cause its not my native language, but "link rod" you mean that small diameter ruber hose ?

That's the EGR actuator pipe, not the turbo.

The turbo actuator is underneath. While the engine is running the link rod should be taught. If it's slack then it's been released for soem reason as a fail safe.

On the opposite inner wing there should be a MAP sensor on a small pressure line. T into this line.

 

[Dieselman]

the turbo wastegate actuator is underneath the turbo ?

sory for my english, cause its not my native language, but "link rod" you mean that small diameter ruber hose ?

No, there should be a connecting steel rod runs from the vacuum diaphragm to the waste gate located inside the hot turbine housing.

 

[poisas]

I would like to check this thing,
"The turbo actuator is underneath. While the engine is running the link rod should be taught. If it's slack then it's been released for soem reason as a fail safe."
but still got no clue how to find that link rod wich has to be "taught" (what means taught?) there is no such word in my vocabulary, i thought it means "hard" but if its a steal one, so its naturaly hard.. .

No, there should be a connecting steel rod runs from the vacuum diaphragm to the waste gate located inside the hot turbine housing.

 

[tuikku]

.
The “basic situation” of the wastegate is “open”.
When you start the engine, vacuum pulls it “shut”.
-> check the vacuum pipes, and pressure converters, leaking could be anywhere.


The sound points to air hoses.
Or broken cooler.
Maybe air is leaking.
-> no boost, no power.

When you get the “normal” boost rising back, you also get low-end torque and power.

Hopefully I understand right your problem.

 

[poisas]

ok, it sounds simple, but no service want to do so,
but dieselman sais that boost has to be when the car is in the road, not standing still... so it means that i don't know if there is boost or not, while i will mesure it. You describe the problem solution witch i hope it is that problem.. but how to see when the wastegate is open or closed ?

.
The “basic situation” of the wastegate is “open”.
When you start the engine, vacuum pulls it “shut”.
-> check the vacuum pipes, and pressure converters, leaking could be anywhere.


The sound points to air hoses.
Or broken cooler.
Maybe air is leaking.
-> no boost, no power.

When you get the “normal” boost rising back, you also get low-end torque and power.

Hopefully I understand right your problem.

 

[tuikku]

.
When the car is standing still, program notes that, and limits the fueling in very low level.
Boost rise maybe only till ~0,5bar.
And, if there are leaking hoses, it don’t rise at all.

Pull the wastegate shut “by hands”, and try then, carefully.
If boost then rises, fault is then somewhere in vacuum system.

 

[poisas]

pull W H A T !? where ? i dont recognize wastegate in my car, i spend hours looking for something to puull. found nothin,
about presure its corect, it feels like about 0.3bar, could anyone picture me where is that f..kin wastegate ? i gave some images...
http://www.mbclub.lt/components/com_joomlaboard/uploaded/images/PA280066.JPG
here can you see the wastegate ?

.
When the car is standing still, program notes that, and limits the fueling in very low level.
Boost rise maybe only till ~0,5bar.
And, if there are leaking hoses, it don’t rise at all.

Pull the wastegate shut “by hands”, and try then, carefully.
If boost then rises, fault is then somewhere in vacuum system.

 

[tuikku]

.

 

[poisas]

corect ? than there as you can see in picture i canot find such thing on the turbo..
http://www.gnttype.org/techarea/pictureguides/turboguide/TA49vsPTE51.html
here is more photos now i see what should i look for, gona try again with a flash light.

.
Exaust<-

->Airfilter

 

[poisas]

yep i thing i found that thing, but its imposible to do as dieselman said, because that thing is directly under the turbo and all exaust manifold, i tried to reach from the top its hot now i can touch it but i canot find that rod so the only way in my case doit from under the car..