C5 Mk 1 2004 2.0 HDI problem

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Graham55
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C5 Mk 1 2004 2.0 HDI problem

Post by Graham55 »

Having had the C5 for just over a month now, I've thoroughly enjoyed it.

I do have a couple of questions which I hope you can help with.

1. I found a small diameter rubber hose about a foot long hanging underneath the engine try. I soon realised it wasn't connected to anything. Any ideas where it might have come from?

2. I have a 50 mile round trip commute, mainly on A roads. In the past week when putting my foot down to accelerate from about 50-60mph nothing happens. The foot is on the floor, the revs are increasing at a snails pace. Impossible to overtake anything. No error messages on the display. A few minutes later everything is back to normal. This has happened 4 times now. Could it be linked to the pipe above?

Thanks

Graham
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Chris570 »

my first thought is turbo vaccuum hose, i'm not sure where the electrovalves are located on a c5 but you should have a small diameter rubber hose come off the turbo and go to a small plastic block about an inch square and 3 inches deep
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Gibbo2286 »

If it's hanging on the engine tray it's likely to be disconnected from the turbo actuator, a real sod to reach.

The electrovalves mentioned above are under a plastic cover at the bulkhead on the same side as the battery, there are three of them one to the turbo actuator, one to the butterfly valve in the air intake pipe and one to the EGR .

If you take the cover off you should be able to track the pipes to their destinations.
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Graham55 »

I assume this is all reached from under the car rather than above ?

If it is a hose from the turbo, would it cause these intermittent power issues? wouldn't it happen every time I accelerated?

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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Gibbo2286 »

Graham55 wrote:I assume this is all reached from under the car rather than above ?

If it is a hose from the turbo, would it cause these intermittent power issues? wouldn't it happen every time I accelerated?

Graham
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by 411514 »

The hose you describe sounds like the fuel filter drain hose. Is it a clear (all be it dirty hose) or a black one. If its clear probably the fuel filter drain hose, just pushes back onto the nipple under fuel filter housing. From what ive heard the main problems with the sort of powerloss you describe on these engines are usually down to a faulty maf unit rather than egr or serious turbo fault, although you would normally expect a bad egr to give a continuous fault rather than intermittent, sam
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Graham55 »

Sam,

It's a black hose, I'm planning to get under the car this weekend to try and see where it's from. I did wonder if it's an aircon drain pipe.

The power issue is a bit strange as it's only happened once this week, last week it was everyday. Is the MAF easy to find and replace?

Thanks

Graham
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by 411514 »

Graham, Yes the MAF is very easy to replace. It is part of the inlet piping just after the airbox, couple of screws and a jubilee clip and its off. With your head under the bonnet looking down on the air box it is the first plug you come to, a couple of inches after the airbox. The maf appears to be the component that requires regular (70-80k ish miles) replacement. If you are able to borrow a known good Maf then this may be a cheap way to exclude/confirm any fault in this component, as a genuine Maf costs around £120 and cheap ebay jobbies are best avoided. Might be worth posting a photo of the pipe you describe as it may turn out to be simply a pipe dropped into the bay by a sloppy mechanic, sam
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Graham55 »

Sam,

Thanks for that, daughters borrowed (nicked) my camera.

The hose is 17" long - 1/4" diameter (showing my age here!). The rubber is not very thick, so it's quite a large hole, if that makes sense.

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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Graham55 »

This hose I have found, after closer examination today is not black but clear plastic - it was very dirty !

Having spent 40 minutes under the car trying to see where it came from was a waste of time.

Whether it is the cause of my intermittent power loss I don't know.

I think the MAF might be the cause of the power issue, the hose will just have to stay in the garage waiting for inspration !
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Lighty »

The hose is certainly the fuel filter drain, hence not really important.
Maf is probably the most likely fault of power loss, could also be defective brake light switch.
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Graham55 »

I am intrigued as to how a faulty brake light switch can cause a loss of acceleration, are you saying if the car thinks it's braking it will not accelerate?

I will investigate the fuel filter, thanks for that.
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by myglaren »

Yep, exactly that.
Logic being that if you are braking you won't need to accelerate so it shuts of the fuel to the engine to assist with the braking.
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by oneday »

you learn something everyday on here
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Re: C5 Mk 1 2004 2.0 HDI problem

Post by Graham55 »

That's a bit spooky, where is this switch and how easy is it to check/test/replace
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