C5 2.0 HDi power loss.

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centurus2400
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C5 2.0 HDi power loss.

Post by centurus2400 »

This started to happen intermittently a few days ago , and has now got to the point where the car would have a hard job to out accelerate a milk float!

It feels as if the turbo isn't doing anything, but when you rev the engine you can hear it spooling up quite happily. I am therefore assuming that for some reason the ECU isn't getting the message that boost pressure is there, so isn't increasing the fuelling to match.

The EGR was blanked off years ago.

The management light hasn't come on, and though the car is gutless it isn't in 'limp home' mode.

All plugs/sockets/wiring clean and OK, and no split vacuum pipes as far as I can tell. The boost sensor pipe is also fine.

MAF is original (140,00 miles), but up until this started to happen the car was going very well, so I think it's unlikely to be faulty.

8 valve engine, no FAP to worry about, nor does it have a variable geometry turbo.

Any pointers on where to go from here please?
Last edited by centurus2400 on 28 Feb 2011, 09:21, edited 1 time in total.
pugsick
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Post by pugsick »

Hi there,

I am sorry you are having problems.

I dont know if it is of any help but if you look at my 'thread' under 'anythoughts' you will see that i appear to have simular issues.
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Post by citroenxm »

Ive got this on a Xantia 110bhp HDi - its currently intermittent too, mostly in the mornings when its cold... then after a while all hell breaks loose (Ive a tuning box on)

I nice thought the Turbo boost sensor, Ill try a swap for another and see what happens.

Paul
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Re: C5 2.0 HDi power loss.

Post by woodywoodpecker »

centurus2400 wrote:This started to happen intermittently a few days ago , and has now got to the point where the car would have a hard job to out accelerate a milk float!

It feels as if the turbo isn't doing anything, but when you rev the engine you can hear it spooling up quite happily. I am therefore assuming that for some reason the ECU isn't getting the message that boost pressure is there, so isn't increasing the fuelling to match.

The EGR was blanked off years ago.

The management light hasn't come on, and though the car is gutless it isn't in 'limp home' mode.

All plugs/sockets/wiring clean and OK, and no split vacuum pipes as far as I can tell. The boost sensor pipe is also fine.

MAF is original (140,00 miles), but up until this started to happen the car was going very well, so I think it's unlikely to be faulty.

8 valve engine, no FAP to worry about, nor does it have a variable geometry turbo.

Any pointers on where to go from here please?
centurus2400,
Hi m8 try unplugging your maff and driving it you should notice a big difference if its not working, its worth a try.
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Post by Paul-R »

pugsick wrote: but if you look at my 'thread' under 'anythoughts' you will see that i appear to have simular issues.
Can you post a link to that?

Is it, perchance, in the Peugeot section?
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Post by Paul-R »

To answer my own question - yes it is!

http://www.frenchcarforum.co.uk/forum/v ... hp?t=34619
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centurus2400
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Post by centurus2400 »

Well, I might be answering my own question here....

The fault started out as an intermittent one, and as the engine has been remapped you were left in no doubt when the power did arrive, it really pushed you back in the seat. Now it's a permanent fault


:cry:

Favourites so far are either the MAF, or the vacuum electrovalve which controls the waste gate. If this is inoperative then there will be no boost as the flippin system seems to operate in exactly the opposite way to what you'd think.

I'll try disconnecting the MAF and see if it makes any difference.
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Post by citroenxm »

If you disconnect the MAF and try, she shouldn't start, as the ECU will not know what air is comming into the engine so wont know what fuel to put in....

You may even upset the ECU trying with out the MAF and throwing the Diagnostic light on, which then may be a Lexia sessh to put it out...

I doubt its the MAF... but can't tell you what it may be just yet till I start looking at mine.

Paul
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
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Post by CitTone »

Could be a boost leak between turbo and inlet manifold?

My SAAB did exactly this...no failure lights, just intermittent then complete loss of guts as a split developed in the hose between the intercooler and inlet pipe.

The trouble with loss of pressure here is that the ECU rarely seems to view it as a fault - it just tries to compensate!
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Post by Chris570 »

the HDi will detect a bad split in the pipe as it will see it as low boost pressure and chuck it into limp home mode (won't turn the turbo on either)

i know this from expensive experience :(
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Post by wright »

blocked exhaust?
02 C5 2.0 hdi 110
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2010 Peugeot 207 SW 1.6 8v HDi 161k and rising
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Post by citroenxm »

Cant be, it clears in seconds and goes as normal, its a fueling or sensor fault ot ECU picking a false reading somewhere....

A blocked exhaust would be permanet slow, or even no go at all

Paul
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
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Post by fynnbar »

Chris, do you mean a split vac pipe or split intercooler/inlet pipe. You do not get a MIL or limp mode for low boost post-turbo. The MAP sensor is purely to detect normal or overboost scenarios.
Woody is right - disconnecting the MAF is a good way to see if it's faulty. The ECU will run the car on a generic map, which is better than running it with a faulty MAF reading, hence you'll see an improvement.
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Post by wright »

will it rev freely?
02 C5 2.0 hdi 110
centurus2400
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Post by centurus2400 »

OK, some progress on mine.

Disconnected the MAF, engine started and ran fine, no improvement in performance.

Stupid MIL light has now come on, so it may need to be frightened with a lexia to make it go off again :x

Will re-check again for leaks or split hoses, but have also located another vacuum electrovalve to try ouit as well.
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