2.0 110 HDi - Lack of power

[Ereinan]

Hello Everybody

After several hours of read on this wonderful forum I have decided to post my own problem as I can’t find the correct fault.

First my stats:
2.0 HDi RHZ Engine
106.000 miles on the clock.
1000 since last oil change
500 since last fuel filter change
Used injector cleaner on my last fill up (no change)

I bought the car a couple of weeks ago from my sister. It was remapped several years ago, and the performance was then pretty good. Now it seems dead before 2800-3000 and then it’s a short burst of good acceleration and then it’s dead again. The brakes seems a little hard as well, but that can very well be my imagination since the car is somewhat new to me (although I can’t remember any of that in the past). When i rev it up in the engine I can hear the turbo spin up and when It gets back to idle it sounds like a jet engine revving down (or something like that)

The pipe from the intercooler seems fine. I have checked the vacuum lines and they all seem fine. Tried to swap the EGR and turbo solenoid and the performance then was truly dreadful. It sounded like a lorry and drove like a snail. The worst performance of any car I have ever known. It was recently on AC service (just before I bought it) and was then diagnosed. I was told there was no fault code to be found.

So I was hoping that anyone could please shed some light on my problem, it would be greatly appreciated
PS Sorry for any mistake in spelling as I am from Norway

[lozz]

Hi mate, and welcome to the 406 Mad house,

Brakes, : they seemed hard on mine when ifirst got it, no problem with them tho it was just me needing time to get used to them,


Lack of power, try giving it a italian tune up on a empty motorway,
a drop of Red/ex or fuel treatment may help too,

[ally406]

Welcome

Did this start happening shortly after changing the fuel filter? Strong possibility that it hasn't sealed correctly, or another fuel system component has been disturbed during the change. This would lead to air ingress into the fuel line and produce exactly the symptoms you describe.

[Doggy]

I was looking at another 110 a short while ago, which had almost identical symptoms. When we checked with the PP2000 system, there were no fault codes, but by watching the live data, you could see the actual turbo pressure was not reaching the value requested by the ecu, except around the engine speed you described.

Unfortunately, I did not find the answer, but did find some things you can check:

Check if you have turbo boost pressure - squeeze the pipe from the intercooler with the engine idling, then rev the engine - the pipe should become almost rigid due to internal pressure.

If the brakes are poor as well, you may have a faulty vacuum pump - I understand this can be tested with a vacuum guage, but don't know what value to expect. (Saw some information which suggested 30 ins HG, but that's just over 1 Bar, which is clearly impossible. Anything over 500 mBar is probably OK).

The vacuum system ultimately must work the actuator on the turbo to control the boost. It may be possible to move this manually, if so get someone to do so, then rev the engine to see if there is now more boost.

If there is, you have a vacuum / solenoid / actuator fault, if not you may have a turbo problem. Faulty turbos are rare, so it may be worth further searching for a boost leak - pipe work / intercooler / inlet manifold gasket / breather system.

Hope that's some help, please let us know how you get on.

[Ereinan]

A big thank you for the welcome and for the answers

I was looking at another 110 a short while ago, which had almost identical symptoms. When we checked with the PP2000 system, there were no fault codes, but by watching the live data, you could see the actual turbo pressure was not reaching the value requested by the ecu, except around the engine speed you described

I am aiming to purchase a lexia 3 diag, but as this take a month in the mail I must pursue other options first.

If there is, you have a vacuum / solenoid / actuator fault, if not you may have a turbo problem. Faulty turbos are rare, so it may be worth further searching for a boost leak - pipe work / intercooler / inlet manifold gasket / breather system.

I do not beleive that the turbo itself is at fault, it seems healty when it eventually kicks inn and the boost then is quite good. I think i will investigate the actuator and the vacuum possibility first. But I will have to purchase a vacuum gauge before that

Did this start happening shortly after changing the fuel filter? Strong possibility that it hasn't sealed correctly, or another fuel system component has been disturbed during the change. This would lead to air ingress into the fuel line and produce exactly the symptoms you describe.

No this fault is older than that, it seems the filter did no change to the performance.

Lack of power, try giving it a italian tune up on a empty motorway,
a drop of Red/ex or fuel treatment may help too,

Perhaps this will work since its been "lady" driven these last few years.

[Ereinan]

Just came to think about this:

Tried to swap the EGR and turbo solenoid and the performance then was truly dreadful. It sounded like a lorry and drove like a snail. The worst performance of any car I have ever known.

But i think it is wierd that the performance should be so poor. Doesnt that imply a faulty soleniod or something?

[Coops]

My 2000 reg 110 HDI also had these symtoms and, after changing the vacumn solenoid on the bulkhead, there was no change. However I changed the Mass Air Flow meter (the one attached to the lid of the air filter box) and it cleared my problems, normal service resumed.

Cheers
Coops

[Ereinan]

After Coops post i finaly tried disconnecting my MAF yesterday. Normal power resumed right away. So I guess it was a easy fix although I think this part is costly at Pug dealer. But at least now I know what was wrong

Thanks for all the help you have given me

[Coops]

Ereinan, got mine from e-bay about £33 including the postage.

Cheers

Coops

[406dailydriver]

i have just had this same problem, disconnected the MAF and is now spot on. will be leaving it disconnected untill new one arrives courtesy of ebay.

[hammerman]

Could be my problem.Which is the maf?The sensor/connector on the air box??

[Doggy]

Yes, it's just after the airbox, in the pipework. A 2.0's is 80 mm dia x about 60 long, cylindrical, with a small 'box' the connector plugs into on the top.