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Discussion Starter #1
Help i seem to have a problem with loss of power it almost seams that the turbo isn`t kicking in. There are no warning lights on the dash and seams to disapear over night. I was wondering weather the fuel filter might be blocked as it seams to do it when the tank is showing in the bottom 1/4
 

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yes the first thing i would try is the fuel filter,then if no diffrent try unpluging the mas sensor plug,that will give u a light on dash but if it runs ok it could be a bad or dirty mas sensor,and if no dirent try thr egr valves.
 

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Thanks for the advice i have recivied the filter today from euro car parts it looks like quite a straight forward job. Is there anthing i should look out for or can i just unscrew the cap replace o ring and filter and prime before starting.
 

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simon807 said:
Thanks for the advice i have recivied the filter today from euro car parts it looks like quite a straight forward job. Is there anthing i should look out for or can i just unscrew the cap replace o ring and filter and prime before starting.
remove pipes off filtertop.becarfull you don't break the top as these are very prone to breaking most ppl do just change the whole housing,but it should be ok if you carefull,put new filter in,top back on pipes back on.and if you have a priming bulb pump that .if its like a 307 hdi they are self priming,but before trying to turn it over streight away,turn ignition on wait for the pumps to stop,do that about 3 times then try starting it i will check to c if they are self bleeding just to make sure good luck
 

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Discussion Starter #5
Completed the filter charge it only took 10 minites from start to finish.The old filter was very dirty and the car now seems a bit more responsive only time will tell if its sorted the problem.
 

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Discussion Starter #6
Can`t believe it the cars been running fine all week but on my way home from work it played up again same as before. I`d better have a look at the mas sensor were is it ?
 

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mass air flow sensor should be located next to the cars air box,pull the plug off and run the car with this off,it will bring a dash light on.if it runs fine with the air flow unplugged it needs replacing.although with the maf unplugged it will be slightly underpowered.
could also be boost leak or egr problem
 

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Discussion Starter #8
All parts changed and its still losing power. at least now the ECU light is coming on so peugeot might be able to read a code error from the system . Reading up on some of the forums it seams as though the exhaust pressure differencal sensor might be a causing the problem. I rang my local dealer and peugeot now use a different sensor with a few mods to the existing set up is it an easy job to do or should i leave it to the profesionals.
 

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All parts changed and its still losing power. at least now the ECU light is coming on so peugeot might be able to read a code error from the system . Reading up on some of the forums it seams as though the exhaust pressure differencal sensor might be a causing the problem. I rang my local dealer and peugeot now use a different sensor with a few mods to the existing set up is it an easy job to do or should i leave it to the profesionals.
So did you ever get to the bottom of the problem? I have the same problem with my 2.0 HDI which has just become apparent and only ever seems to happen when it starts raining, then lasts for a few days when its dried out again!
 

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I had exactly the same problem as you.

My mechanic tried all sorts - including blocking the EGR off, fuel filters, MAS sensor and checked the turbo was OK. In the end they found an actuator arm broken in one of the gate (exhaust possible?) on the turbo and when they replaced it hey-presto!

Now after months of nice motoring it's back to it's old tricks again :(

Loathed to go back to the same mechanic and short on funds so could do with knowing how to check that actuator!
 

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Actually I think I just solved my problem with the help of another forum.

It seems that the HDI's suffer with worn vacuum pumps. In order to close the wastegate they use two vacuum pumps to suck them closed. I was told to spray a little WD40 into both of them and so far it seems to have worked!

I suppose only time will tell, because this problem seems to ocme and go at will, however I will say that it rained this morning and yet the problem right now has gone away :)
 

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Sounds both interesting and logical (ha "logical" say the IT geek with little mechanical knowledge).

Where would these pumps be on the 806 and what am I looking for?
 

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large pump is on rhs of engine cylinder head, take off pipe and spray it in!

There are also two smaller black plastic devices if you trace the vacuum pipes away from the engine, I took the inlet pipes off these two and sprayed there too for luck. All seems fine now!
 

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One other thing I learned - coming from another IT Bod!

If you start the engine and leave it running, don't rev it, then press the brake pedal lots of times fast it should go hard. Then whilst its still hard push yr foot down on the pedal and hold it there. If the pedal "creeps" to the floor, its probably not a vacuum problem. If it doesnt creep at all then you havent enough vacuum pressure to build up the brake servo (or something like that).

Never had this problem with my Asus . . .
 

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Very true - never have this with a Mac either!

So if it doesn't creep then it could be the vacuum? Intersting - you've foxed me now talking about brakes when dealing with power loss!
 

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The vacuum pump works both the brakes, and also closes the valve in the wastegate which then allows the turbo to build up pressure (giving you the much needed power). Without it, the wastegate would remain open and the turbo wouldn't be able to build up the needed pressure to force the fuel back into the engine. I only mentioned it because it is a quick way of checking if you have a lack of suction . . .
 

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The vacuum pump works both the brakes, and also closes the valve in the wastegate which then allows the turbo to build up pressure (giving you the much needed power). Without it, the wastegate would remain open and the turbo wouldn't be able to build up the needed pressure to force the fuel back into the engine. I only mentioned it because it is a quick way of checking if you have a lack of suction . . .
I tried this and it didn't work. Although I swear that I go a very slight power improvement but the turbo is still not kicking in.

When I say I tried it the pedal slowly when all the way down - which would make the vacuum not the issue.
 
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