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C5 2.2HDI MPG problem

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ja...@homeopath.it

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Dec 20, 2007, 2:12:10 PM12/20/07
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I have a 2002 2.2 hdi C5 92,000 miles on clock which used to do 40+
mpg and now has gradually dropped to 29!

I have owned it from 1 yr old and do mainly motorway miles. She is
regularly serviced by CPR in Rugby who are not main agents but are
Citroen specialists. I also change the oil between services.

CPR are stumped as to the low MPG. Any suggestions please?

TonyB

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Dec 20, 2007, 3:38:52 PM12/20/07
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<ja...@homeopath.it> wrote in message
news:a9f6a25c-7b94-4041...@c4g2000hsg.googlegroups.com...

If there are no other symptoms a fuel leak is possible.
I had a car once that had a leaky injector return pipe which
was almost unnoticeable but droppped the mpg.

Is it all OK otherwise? No smoke, power OK etc?

TonyB

Hoppy

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Dec 21, 2007, 5:03:06 AM12/21/07
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Dear Tony

Thanks for your reply. No, no smoke, but yes a drop in power,
particularly acceleration. Any way of detecting a fuel leak?

Regards

JamesB

Marc Gerges

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Dec 21, 2007, 7:43:21 AM12/21/07
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Hoppy <ja...@homeopath.it> wrote:
>> Is it all OK otherwise? No smoke, power OK etc?
>
> Thanks for your reply. No, no smoke, but yes a drop in power,
> particularly acceleration. Any way of detecting a fuel leak?

You may want to investigate the vacuum pump and assorted circuitry.

I had a 2.0 HDI Peugeot that used vacuum to regulate the turbocharger.
I'd guess the 2.2's hardware looks similar.

cu
.\\arc

Hoppy

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Dec 21, 2007, 7:51:33 AM12/21/07
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Thanks Marc

TonyB

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Dec 23, 2007, 8:18:02 AM12/23/07
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>
> Dear Tony
>
> Thanks for your reply. No, no smoke, but yes a drop in power,
> particularly acceleration. Any way of detecting a fuel leak?
>
> Regards
>
> JamesB

If it's losing power it's unlikely to be just a simple return pipe leak I'm
afraid.
I think you parobably need a garage now, unless it's a turbo pipe leak which
you may hear as a hissing noise. On the Landrover diesels this problem
was sometimes caused by the turbo hoses collapsing internally so it could
just be worth
taking them off for a look.

Could be a blocked or very dirty intercooler too, you may be able to take
that off for a look
and flush out. Don't clean it with petrol. ;-)

TonyB

TonyB

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Dec 23, 2007, 8:18:52 AM12/23/07
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>> I had a 2.0 HDI Peugeot that used vacuum to regulate the turbocharger.
>> I'd guess the 2.2's hardware looks similar.


Good point - also could the turbo wastegate be jammed open?

TonyB

Hoppy

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Dec 23, 2007, 1:41:30 PM12/23/07
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Thanks for these suggestions

JamesB

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