"Richard Swaby" <richard@[EMAIL PROTECTED]
> wrote in message
news:15ikv312gjtiuv3jjkcbqrch8e0e3n9fo1@[EMAIL PROTECTED]
> On Mon, 7 Apr 2008 16:32:43 +0100, "Godfrey Wilkes" On Mon, 7 Apr 2008
> 16:32:43 +0100, "Godfrey Wilkes" <nospam@[EMAIL PROTECTED]
> wrote:
>
>>
>>"Richard Swaby" <richard@[EMAIL PROTECTED]
> wrote in message
>>news:ca8kv3hb83qfvrnoqe8j3a0ko3r0qvhtkg@[EMAIL PROTECTED]
>>> On Fri, 04 Apr 2008 17:14:36 +0100, Richard Swaby
>>> <richard@[EMAIL PROTECTED]
> wrote:
>>>
>>>>My recently acquired 307 lacks power. Everything happens in the first
>>>>half inch or so of accelerator pedal movement. Pressing it beyond that
>>>>has little effect.
>>>>
>>>>The local garage has just changed the timing belt at 95000 miles. I
>>>>had them check for fault codes but they found nothing wrong. They
>>>>reckon that the turbo isn't spinning and advised me to take it to a
>>>>Peugeot dealer, something I'm reluctant to do, given the way they
>>>>charge!
>>>>
>>>>I've checked the air flow sensor which is working normally. Are there
>>>>any other sensors I should look at before biting the bullet? If so can
>>>>anyone suggest where I can find the normal sensor readings?
>>>>
>>>>Thanks in advance
>>>>
>>>>Richard
>>>
>>> The saga continues.
>>>
>>> I've tested the MAP sensor on the road. The reading at tickover or
>>> with the engine stopped is 2.34 volts. The highest reading I got was
>>> 2.6 volts at about 3500 RPM pulling uphill in second gear. Fairly good
>>> news I suppose because it shows that the turbo is at least doing
>>> something. I reckon that if it was broken if anything I'd see a vacuum
>>> at the intercooler.
>>>
>>> On the downside though, the antipollution fault has just come up. Do
>>> you think that has been the trouble all along?
>>>
>>> Thanks
>>>
>>> Richard
>>
>>Yes. The engine is limited to 2500 RPM when antipollution fault comes
up.
>>Would explain the lack of power.
>>
>>Godfrey.
>>
> Thanks Godfrey
>
> It's starting to make sense. I measured the boost pressure in the hose
> from the intercooler to the inlet manifold. The highest pressure
> measured is about 2.5 psi or 0.16 bar which corresponds to about 2.6
> volts. Also, the MAP sensor reading drops to 2.25 volts on overrun,
> suggesting a vacuum in the inlet, which is what you'd expect if the
> turbo stops blowing. All this suggests to me that the MAP sensor is
> probably OK.
>
> Could there be something wrong with whatever controls the turbo? Is
> there a solenoid valve or something that controls the waste gate?
> Perhaps the waste gate is stuck open.
>
> By the way, the antipollution fault has mysteriously gone away.
>
> Sorry if these questions show my ignorance. I've never had a turbo
> diesel before.
>
I can't add much else as I'm no expert on turbo diesels, apart from being
an
owner of a 307 HDi DTurbo 110 which suffered from the dreaded
antipollution
fault about a year ago. The only adverse effect was rev limited to 2500
RPM.
As I was on a motorway at the time the car continued to drive normally as
2500 RPM in 5th gear is over 70 MPH. Anyway, the fault was fixed by my
Peugeot dealer under warranty. They replaced the particulate filter in the
exhaust system and the lambda sensor (exhaust gas oxygen sensor). Check
this
out: http://www.picotech.com/auto/lambda_sensor.html
I suspect the problem with your car could be a failing sensor. One other
thing, the turbo in my car makes a distinctive whine but I can only hear
it
with the windows open. Presumably you can hear the turbo working in your
car?
Godfrey
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