Low power on 207cc 1.6hdi

[tretorn]

¡Hello there!

It has been a year since I bought my wife a 207cc (1.6hdi from 2007) and since then we have
been unable to make it work fine. It has a low power condition that makes it impossible to
reach more than 60mph even full throttle in third gear... I have the same engine on a C4 and
I can confirm this one is completely off.

I have swapped glowplugs, the fap additive tank, the maf (2 times), charge pipe, valve cover
and a few more points of conflict. I had it smoke tested for leaks and made sure the turbo
works. Sadly none of this have fixed my problems and I'm starting to loose hope.

I have taken a bit of live data:

And the related code:

Everything seems to point out to a turbo problem. But I don't have enough knowledge
to tell how to proceed from here (I'm not a mechanic, just a guy who likes to fiddle with cars)

If anybody has ideas, I will test them and update this post.

All help is appreciated.

Best regards!

[mickthemaverick]

Unfortunately your images cannot be viewed in the UK, follow the instructions in the link below and add the pictures directly to your post:

viewtopic.php?p=516529#p516529

[tretorn]

Unfortunately your images cannot be viewed in the UK, follow the instructions in the link below and add the pictures directly to your post:

viewtopic.php?p=516529#p516529

Thank you so much! Way easier than to use a 3rd party to upload.

I have edited the post.

Best regards

[mickthemaverick]

As you have already swapped a fair few bits I'd suggest replacing the turbo pressure solenoid valve which is not too expensive. It may be you have a vacuum leak in the system so check that there are no vacuum hoses broken while replacing the valve.

https://www.ebay.co.uk/itm/273264373098

[PaulC5]

Our 2.2 hdi C5 had a P0299 code that popped up occasionally but did not put on the engine light and was found with a code reader. Live data showed the MAP sensor (boost pressure) was not changing much as the accelerator pedal was pressed. I replaced the MAP sensor and that seemed to fix it and it accelerated a lot faster. The old one was bunged up with oil. A couple of years later the code appeared again but I did not do any checks. I also replaced the MAF sensor but that made no difference.

We had a C4 1.6 hdi that did not accelerate well and under its 3 year warranty the dealer replaced the fuse unit mounted on top of the battery. They did a diagnostic to find this fault.

[tretorn]

As you have already swapped a fair few bits I'd suggest replacing the turbo pressure solenoid valve which is not too expensive. It may be you have a vacuum leak in the system so check that there are no vacuum hoses broken while replacing the valve.

https://www.ebay.co.uk/itm/273264373098

I will order it just in case. As you said it is pretty inexpensive and accessing it allows me to check the vacuum lines. (maybe i will swap them "while i'm already there")
it will probably take the part a couple of days to arrive so I will update once they get here (:

Thanks for your help!

[tretorn]

Our 2.2 hdi C5 had a P0299 code that popped up occasionally but did not put on the engine light and was found with a code reader. Live data showed the MAP sensor (boost pressure) was not changing much as the accelerator pedal was pressed. I replaced the MAP sensor and that seemed to fix it and it accelerated a lot faster. The old one was bunged up with oil. A couple of years later the code appeared again but I did not do any checks. I also replaced the MAF sensor but that made no difference.

We had a C4 1.6 hdi that did not accelerate well and under its 3 year warranty the dealer replaced the fuse unit mounted on top of the battery. They did a diagnostic to find this fault.

I will try to get this part today and cross my fingers. It looks like a really easy job to tackle.

The fuse unit seems a bit more complicated. Maybe i'll try to get a hold of one on a junkyard next week just in case the map doesn't fix the issue.

Thank you for your help! I'll keep you posted in case any of the two ideas fixes this

[PaulC5]

Rather than just replacing parts that might be faulty, could you not do a diagnostic to check them first which might save money if the parts are in good condition ?

[RichardW]

Is this a 90 BHP or 110 engine? I think the 90 uses a waste gate whereas the 110 uses variable geometry. Either way the turbo control should be free to move. If it's 110 the actuator should pull down when you start the engine, and it should be easy to press down and spring back when the engine is off.

[tretorn]

Rather than just replacing parts that might be faulty, could you not do a diagnostic to check them first which might save money if the parts are in good condition ?

You are completely right. Sadly in my city getting parts takes a long time, so I will order them and in the meantime diagnose the original ones.

[tretorn]

Is this a 90 BHP or 110 engine? I think the 90 uses a waste gate whereas the 110 uses variable geometry. Either way the turbo control should be free to move. If it's 110 the actuator should pull down when you start the engine, and it should be easy to press down and spring back when the engine is off.

This is the 110 engine, do you happen to have any pic of the location of the spring?

[RichardW]

There's no visible spring, but it's right on the front of the turbo between the two halves. You should be able to push it down relatively easily engine off then it should come back up quickly - if it's stiff or doesn't come back smoothly the internals are sticking.