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Discussion Starter #1
Hi all,

I have had this car for 7 years and it has 135K miles on the clock. I had an issue where if it was revved for 3.5K Rpm for a while it would go in limp mode and not throw up a fault. Switch off and back on and all would be fine.
This cleared itself when I had a turbo boost pressure sensor fault a while ago.

Now recently I get an engine fault come up with limp mode every time I go above 3K Rpm. When accelerating I sometimes get a loss power for a second then it comes back, I just put it down to one of those things. I also get a lack of power in 4th, 5th and 6th gear at 2K Rpm. it will accelerate but power keeps dipping until about 2.5 to 3K Rpm like its cutting the fuel. There is a flatspot around 2.7K.

I have a version of Planet, but I`m lost as what I`m doing with it, I don`t want to do something I shouldn`t. When I look at faults etc I did notice that for turbo condition it says "Single turbo operation with wastegate" is this normal for the 2.2 HDI 170?

The car drives fine with the only fault code that comes up is P1351 but from what I have read thats a normal glow plug fault. According to Planet the EGR valve opens and closes depending on the engine speed etc. The DPF is regenerating every 300 to 400 Km but it does say that I have over 32000 litres of additive left.

When I drive above 3.5K and get the fault I get code P0100 which I think is airflow not plausible but it says engine speed is over 5.5K. If I unplug the MAF it wont start but if I unplug after starting the car I still get the issues of lack of power etc.

Any help would be appreciated

Thanks
 

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Crank sensor possibly as your engine speed is at 5800+ RPM when the fault occurred. Were you absolutely redlining your car at the time?
 

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Discussion Starter #4
Crank sensor possibly as your engine speed is at 5800+ RPM when the fault occurred. Were you absolutely redlining your car at the time?
No only got to 3500. Don't need to go above 4000 to trigger the fault. I'll have to check Rpm readings on planet to test the crank sensor. Btw where is the crank sensor located?

Try cleaning the MAF with a spray of iso-propyl alcohol or non-lubricating contact cleaner.
I have cleaned the MAF but could have damaged it or it's not 100% as it's old now.
 

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If it has swirl flaps check the actuator module for a vac leak. It could be when flaps open you get a vac leak which then lowers boost and triggers airflow fault
 

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If it has swirl flaps check the actuator module for a vac leak. It could be when flaps open you get a vac leak which then lowers boost and triggers airflow fault
Is that easy to check or is there a guide I could look at to help. But I will look into that.

As for the high rpm I took it for a drive and if I accelerate gently I can go above 4000 rpm but if I accelerate hard I get engine fault and error code.
 

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2700rpm is when it starts using the big turbo.

"Single turbo operation with wastegate" makes me wonder whether it is not able to use the big turbo.

The big turbo is controlled by two electrovalves: VT2 controls exhaust flow to the big turbine and Vrec switches the big compressor between supplying the inlet and just recirculating air. I guess one of these wants replacing.


Graphical parameter measurements might give you some clues (example attached (VT1 is the wastegate)).

Tech docs for turbocharging: https://www.dropbox.com/s/7udk2rifk9ty0t8/407_2-2_hdi_air_supply_info.pdf?dl=0
 

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Graphical parameter measurements
I tried to do Graphical with planet but I couldn`t get it to work, I also tried to install Diagbox but could not get to work either, I guess that would give me a clue as to whats going on. When I run planet I can see various values for VT2, Vrec etc but I have no idea what any of it means.

Are the electrovalves easy to get to and to check or is it a garage job? I need to find a good HDI specialist in the Cambs area.
 

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Read the tech doc!

On the 407 there is nothing in Diagbox that isn't in Planet. (What Diagbox does that Planet doesn't is newer stuff like 508s.)

Note that in graphical parameter measurements the graph isn't drawn until after you stop recording.
 

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I have had a read through of the tech doc and apart from being a complicated turbo system, I guess I`m looking at items 26 and 29 in section 6.3. So when I get some time i`ll have a look at the valves and also all the pipework for damage. Can I swap the valves over to see if the fault changes or are they different.


Note that in graphical parameter measurements the graph isn't drawn until after you stop recording.
I get a blank screen saying please wait so I gave up as it was taking too long even on a record that was less than a minute.
 

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Discussion Starter #13 (Edited)
I still cant the graphical parameter measurements to work, I have tried a new VM of XP and an install of planet V25, so im not sure what do with that.

I took a recording of second air intake measurements and I can see the turbo condition change to dual mode and back to single when I get above 2700 rpm and below again.

Vrec
After looking at the flow charts in the tech doc its says that the "Vrec" air recirculation valve is open in all three flow charts but mine closes when the second turbo starts. But after checking the graph posted by RWB that closes as well.

VT2
While I was driving VT2 would go from 100% to 0% above 2700 rpm but on a few occasions it would differ from the VT2 reference value by as much as 50%.

2700 rpm is where I get the flat spot almost like there is a delay in turbo 2 being engaged. There are a couple of flat spots between 2000 and 2500 more noticeable in 4th, 5th and 6th gear but I dont think that has anything to do with turbo 2.

edit
When I got the P0100 error again it said 5500 rpm but live data went to 4100 rpm.


Thanks
 
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