V6 CDI. Loss of power after replacing DPF Pressure Sensor

[ringway]

After the recent DPF problems on my V6CDI Vito, I had the pressure sensor changed yesterday.

The van is now less responsive and feels as though it has lost 40-50bhp if that makes sense.

Even when the EML light was on and the van was limping intermittently, on a good day, (when not in limp mode) there was more power and responsiveness than there is now.

A main dealer carried out the works so I should have thought all would be well.

The cost so far (mainly investigative) is £342.00 and I still don't have a result. Makes the removal of the DPF all the more attractive I'd say.


Any ideas please?


TIA.


Paul.

 

[Dieselman]

Go back to the dealer, maybe they stuck a potato in the exhaust for a laugh...

 

[davidjpowell]

After the recent DPF problems on my V6CDI Vito, I had the pressure sensor changed yesterday.

The van is now less responsive and feels as though it has lost 40-50bhp if that makes sense.

Even when the EML light was on and the van was limping intermittently, on a good day, (when not in limp mode) there was more power and responsiveness than there is now.

A main dealer carried out the works so I should have thought all would be well.

The cost so far (mainly investigative) is £342.00 and I still don't have a result. Makes the removal of the DPF all the more attractive I'd say.


Any ideas please?


TIA.


Paul.

Could it have been remapped? Maybe it's been de-mapped.

 

[BTB 500]

A remap could also explain the DPF problems ...

 

[ringway]

Go back to the dealer, maybe they stuck a potato in the exhaust for a laugh...

So you think it may be chipped?

 

[ringway]

Could it have been remapped? Maybe it's been de-mapped.

The thought had crossed my mind that it had been remapped and the map has been erased.
I test dove several Vito vans and I bought this one solely because it ran so well. I'm on good terms with the guy I bought it from, so I'll ask the question and I'm sure I'll get a straight answer.



That said, something Bill said on another thread some time ago (I'm damned if I can find it) mentioned losing around 40bhp if the software was updated to stop the engine suging.
Each time the van has visited a dealer I have made it very clear that the update must not be performed (this is something I have to point out because as soon as connected to a dealership STAR, the prompt to update appears).

When I collected the van from the dealership on Thursday afternoon, I asked the dealer if the software had been updated and was assured it had not.

I called the dealer this afternoon about the under-performance and they will diagnose if I go there next week. They also checked with the tech again that the software had not been updated; No was the reply.

 

[st4]

I'd suggest getting the DPF taken out, and taking it back to the mapping company afterwards

 

[BTB 500]

I vaguely remember that when the 120 first came out a few had EGR valve issues, and there was some sort of temporary fix that (allegedly) just reduced the power output a bit.

Later on there was an ECU software upgrade which was a permanent fix - mine had that done, and I didn't notice any difference at all. I would still suspect that yours had been remapped ... this often causes an engine to produce more soot, and you have had problems with the DPF ...

 

[ringway]

I spoke with the previous owner this afternoon and he said the van was never remapped.
He did say though, that he's owned and driven several Vito 120's and that mine was the quicker than the others for some reason.


No placebo effect, (I hope not anyhow) but the van appears to be more responsive this afternoon. Yeah, I know..


More testing to come though.

 

[ringway]

Engine definitely less responsive. Revs react on counter 1-1.5 seconds after pressing accelerator and then a slight delay before actual acceleration.

I'll revisit the dealership tomorrow.

 

[corned]

I'll revisit the dealership tomorrow.

Time to follow your own advice, methinks.

Just aim it at the showroom, wedge a brick on top of the gas pedal and jump out.

 

[T34 BOY]

Hi
I found this forum whilst looking for problems with my Vito 120.

Do I have the same problem.

I have a 2006 Vito V6 with 57,000 miles on the clock and it is used mainly for distance work but it can sit unused at times for 2-3 weeks at a time.

This morning I went to take it for it's MOT and there was a major loss in power and the yellow engine warning light was on indicating that the Diesel Particle Filter was full. The engine will rev to a maximum of 3,000 revs and has no power under 2,000 revs. No kick down on the gearbox at all. It makes driving it interesting.

It went through the MOT OK but what was interesting was that I didn't get a sheet for the exhaust emission's. Just a statement on the Certificate saying "Diesel smoke emission's too low to obtain reading"

Before I lose an arm and leg by taking it back to Mercedes just wondered if this is the same problem and should look to remove the DPF altogether.

Thanks

 

[walsi]

Hi ya, i had the same problem with the readings been to low, the mot station blocked the exhaust with a rag in the end to get a reading. I think you will find this is normal for vehicles fitted with a dpf.
Which yellow warning light are you on about that is lit.

Martin

 

[ringway]

Hi
I found this forum whilst looking for problems with my Vito 120.

Do I have the same problem.

I have a 2006 Vito V6 with 57,000 miles on the clock and it is used mainly for distance work but it can sit unused at times for 2-3 weeks at a time.

This morning I went to take it for it's MOT and there was a major loss in power and the yellow engine warning light was on indicating that the Diesel Particle Filter was full. The engine will rev to a maximum of 3,000 revs and has no power under 2,000 revs. No kick down on the gearbox at all. It makes driving it interesting.

It went through the MOT OK but what was interesting was that I didn't get a sheet for the exhaust emission's. Just a statement on the Certificate saying "Diesel smoke emission's too low to obtain reading"

Before I lose an arm and leg by taking it back to Mercedes just wondered if this is the same problem and should look to remove the DPF altogether.

Thanks

Hi ya, i had the same problem with the readings been to low, the mot station blocked the exhaust with a rag in the end to get a reading. I think you will find this is normal for vehicles fitted with a dpf.
Which yellow warning light are you on about that is lit.

Martin

The problem with my Vito was the pressure sensor (next time I'm just going to take my van to Dieselman and save time and money).

DON'T ask me how, but the lack lacklustre performance cured itself a few days after the sensor was fitted. It's a good job it righted itself because I called the service department at Mercedes-Benz Stockport 6 times in one day without a return until a week later. Maybe that was because they thought I might mention again, the ding in the bottom of my drivers door that I noticed when I collected the van. I'd washed the van before visiting the dealership and I'd have noticed the damage if it was evident then.

Is it any wonder I have a loathing for Mercedes-Benz dealerships.

 

[T34 BOY]

Well I have booked it in to have Mercedes run their diagnostics on it on Thursday Morning so will let you know what happens then.

 

[T34 BOY]

Well it turns out that my problem is due to a valve getting stuck in the manifold, The only cure is to replace the manifold itself and of course the recommendation is to replace both manifolds whilst the engine is in bits just in case the other side goes.

They have come across the problem once before on the V6 engine.

So the manifolds are about £350 + vat each side and 12 hours labour @ £816 plus a few seals and the VAT.

Will let you know if it cures the problem.
Bit of an expensive morning by all accounts.

 

[Black c320]

duplicate

 

[Black c320]

cheap solution

Sounds like a failed swirl motor, have a look at my thread on the 300c forum,

gives details how to carry out the repair for a few pence using the method devised by

Alex Crow.

My car is currently running perfect with the swirl motor disconnected and the resistor installed in the plug.

Swirl Motor - cheap replacement solution (Pennies!) - Chrysler 300C Forum: 300C & SRT8 Forums

 

[walsi]

Well it turns out that my problem is due to a valve getting stuck in the manifold, The only cure is to replace the manifold itself and of course the recommendation is to replace both manifolds whilst the engine is in bits just in case the other side goes.

They have come across the problem once before on the V6 engine.

So the manifolds are about £350 + vat each side and 12 hours labour @ £816 plus a few seals and the VAT.

Will let you know if it cures the problem.
Bit of an expensive morning by all accounts.

Are they talking about a valve in the exhaust manifold or inlet??

 

[T34 BOY]

They are talking about an air control actuator in the intake manifold, if that makes sense.
He said this has got stuck and although they can possibly free this they then couldn't guarantee the work and with £800 worth of labour it's one of those situations.
Sorry to be a bit vague but not mechanically minded.