Lack of power (max 2700 rpm)

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Patronbutiken
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Lack of power (max 2700 rpm)

Unread post by Patronbutiken »

Good evening folks
I have got a very strange problem with my 2.0 litres HDI engine (year 2004)
It goes in to "limp mode" when im running for aprox 3 km. and lost the power and will not rew more than 2700 rpm.
enginelight comes on and the error code supplied is P1351 (Pre/Post heating relay circuit - Relay & Pre-Heat plugs not controlled) that shouldnt make the engine goes to limpmode i think,
I have tried to blank of EGR, changed the mass airflow unit, changed the acceleratordevice,
According to bosch-measuring system in my local workshop there is no errors, fuelpressure is good, turbo also seems to work.
the strange thing is when the car has been parked over night it starts perfect and runs perfect untill the coolanttemp i rasied above 50-60 dgr. C.
Could it be as simple as the coolant tempsensor?

Any indeas are more the wellcome

Regards
Peter

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GiveMeABreak
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Re: Lack of power (max 2700 rpm)

Unread post by GiveMeABreak »

The engine CU will put the vehicle into a downgrade mode if there are specific reasons and usually a code is associated with this action. However, it may be a temporary fault, which, when conditions permit, the backup mode clears and normal operation resumes.

The Glow plug fault P1351 is not one that initiates a downgrade mode.

I assume you were just testing your EGR by temporarily disconnecting it - I would get that reconnected as this will cause problems having it disconnected with the engine ECU (apart from it not being legal).

But if you consult the stored logs, it should tell you which fault codes have been triggered.

Patronbutiken
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Re: Lack of power (max 2700 rpm)

Unread post by Patronbutiken »

Thanks Marc.
The EGR is blanked of, so thats not the problem
Well thew only code generated are P1351, no other codes are generated, i will change the tempsensor on monday to se if that's fixing my problem.

Regards
Peter

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GiveMeABreak
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Re: Lack of power (max 2700 rpm)

Unread post by GiveMeABreak »

Yes but blanking the EGR will also cause the engine ECU to compensate or detect a problem and this can cause a downgrade mode. Best of luck.

Peter.N.
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Re: Lack of power (max 2700 rpm)

Unread post by Peter.N. »

If this is the 8 valve engine the pressure regulator on the back of the HP pump can cause this.

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Peter

Patronbutiken
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Re: Lack of power (max 2700 rpm)

Unread post by Patronbutiken »

Marc.
If the EGR i "plugged" or not doesn't matter it still goes i downgrade mode.
Peter.. All the measurement by the computer show perfekt fuelpressure, dont know if its 8 or 16 valves, the engine id DW10.
But i will change the temperaturesensor to se whats happening

Thanks both of you

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Re: Lack of power (max 2700 rpm)

Unread post by Peter.N. »

I think the DW10 is the 8 valve. The regulator sits on the back of the HP pump and has a filter in it that gets blocked, its very fine stainless and I have not successfully cleaned one. They can cause all sorts of problems including 'hunting at tickover and being almost impossible to start when hot. If that it the problem it will only show low pressure under the fault condition.

Have you changed the fuel filter?

Peter

Patronbutiken
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Re: Lack of power (max 2700 rpm)

Unread post by Patronbutiken »

Hello Peter
Its no problem to start either warm or cold, and the fuelfilter is changed, as long as the engine is under aprox 60 dgr C , it runs fine and i have full power.
But over 60 dgr it goes in to downgrade mode, i have now changed the temperaturesensor with no luck.

/Peter

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Re: Lack of power (max 2700 rpm)

Unread post by Peter.N. »

Still possibly the pressure reg, have a look on ebay you may be able to find a secondhand one cheap enough to be worth a try. They are not difficult to change, mounted on the back of the HP fuel pump, two screws and a plug. You may have to remove the fuel filter.

Peter

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Re: Lack of power (max 2700 rpm)

Unread post by Patronbutiken »

Ok Peter
But then the reading in the computer at the workshop would not show perfect pressure on all injectors, the strange thing is that the error is gone if the car has been left over night but comes back when engine goes up over 55-60 dgr C....?

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Re: Lack of power (max 2700 rpm)

Unread post by Peter.N. »

..Or is it when you have driven it and put it under load?

Peter

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Re: Lack of power (max 2700 rpm)

Unread post by Patronbutiken »

It doesnt matter, if i drive or let it stand on idle, i think there is an electrical glitch somewhere as the error comes when the enginetemp is over 55-60dr.
I left it now for a couple of hours and the error i gone, but i let it go on idle and the error return when temp got over aprox 55-60 dgr...
Very strange i think

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Re: Lack of power (max 2700 rpm)

Unread post by Peter.N. »

Most odd. I had a diesel Merc with a similar fault except that it didn't limit the revs just the power. Fine when cold but after a couple of miles the turbo boost dissapeared, mind you the torque was so good that it didn't really matter, it would still do 70mph in 6th. Never did find the problem then got the C5 about 6 months later.

I suspect that the problem was a partially blocked DPF but I don't think your engine has one. It could be that the vacuum feed to the turbo is failing but that could be mechanical or electronic although that shouldn't limit the revs. Does the 2700 rpm limit apply when stationary?

Peter

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Re: Lack of power (max 2700 rpm)

Unread post by myglaren »

I wonder, when you say partially blocked DPF, if it could be the cat blocked up?

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Re: Lack of power (max 2700 rpm)

Unread post by Peter.N. »

Possibly but I can't see why that would only happen when it was hot. You could try disconnecting the exhaust and see if it will rev. I don't know if its got a cat pressure detector either side of it, if so and you could read it that would help. Have you got a Lexia/pp2000?

I told you wrong, it was the cat I suspected on the Merc not the DPF. Can you read the fuel pressure under the fault conditions?

Peter