hdi 110 loss of power

[harryp]

Hello all,
Left home Thursday to travel to a wedding in Leeds.... No power at all under 2K rpm and only started to come in at 3K. Came to a small hill, almost no power at all and then the K light came on. Drove back and swapped cars . Fortunately bride was late by 30 mins, so just made it.... Had the Lexia on today, and it showed fault P0246, pressure at 3470 rpm was 1529, setting 2071, EV cycle 88%, and also fault P1519, consistency between fan speed and setting. Cleared faults, took it on a run for a few miles and going into individual components, all seemed to be working OK - except the fans are not going into high speed, so will have to have the front relay out again, but still have what feels like no power/turbo, although Lexia shows the pressure increases with revs - when stationary and not under power. No faults have been registered though, and seems odd that the fans could effect the turbo? . Had the relay out when I did the aircon condenser and had to rattle it again last week. For once the aircon works without the "overheating light" coming on. Have trawled the threads but can't find a similar match. Is this EV or EGR related, although Lexi seems to show the EV's working . Time for an ice pack???? Hope this is clear, bit confused to say the least.... Will await the collective wisdom, please

[osx]

EGR valve it seems

[RichardW]

Most likely it's the electro valve for the turbo control. Swap over the vac pipe and electrical connector to the EGR solenoid (just blank the vac supply to the EGR solenoid) and see where that gets you.

[citroenxm]

Id completely agree with electro valve... with Richard above.

Putting lexia on may have coincedentaly uncovered another fault!

The turbos on the 110s work in opposite, they default to OPEN WASTE gate when off or no engine running. When the engine is started and the Vaccuum system builds up this then via one of the electro vac valves on the right between drivers sphere and Cam belt cover then closes the wastegate allowing boost when driving into the engine.

The valves are ecu controlled, and the ecu has a set max boost value for engine rev range. Its not a set value but set for a particular engine rev amount, when boost is near its max the ecu then diverts vaccuum to open in the elctrovalve thus allowing the wastegate to open and divert boost away from the engine.

Often these valves go faulty, useually opening and Not allowing any vaccum to the wastegate, and therefore no turbo boost! Occasionally they may stick the other way and the wastegate stays shut, then you get over boost. This puts the car into limp home mode and limits revs to 3k BUT a soft reset - IE Key off and restart will allow it to clear in the ecu untill over boost is active.

Swapping with the other electro valve may work, however, the EGR valve electrovalve may also be faulty, as the EGR is not electronically monitored theres no way of telling.

The valves are horrendiously expensive to buy new.. IIRC..

http://www.ebay.co.uk/itm/GENUINE-CITRO ... 3f46f4bb5e" onclick="window.open(this.href);return false;

Should do the job.

TAKE NOTE of vac pipe connections when removing and fitting them ...

[harryp]

Gentlemen, Many thanks, will try the swap. I wonder if I should also clean the EGR valve itself. Question is, where exactly is it?
Regards

[citroenxm]

On top of the exhaust manifold.. just behind the inlet manifold.. if you peer down behind the engine you will see it.. fix in place by two 10mm nuts (could be 8 though). But to be honest harry. Id not bother with the egr..

I ran my 110 exclusive from 156k to 283k and never ever touched the egr and to be honest never needed an electro valve either and never suffered loss of power untill the intercooler pipe split where it goes into the manifold.. the clue was oil dampness all over the thermostat housing ... but the other clue was lots of black smoke and no go.

[harryp]

Thanks Paul. That's put that one to bed then. Was curious to know where it was anyway! Ta...

[harryp]

Agrrrh. Back to t' drawing board. Swapped EV's over, no change. Swapped valve from spare car, no change, soooooo fired up the Lexia again. Its possible but a little unlikely that all three are knackered??, but M.Sodde often crops up at the most inopportune moments. Back to the Lexia....

EGR valve EV checks out OK (ie clicks); EGR throttle EV ditto; shows 98/99% and 78/79% duty cycle... at 5000 rpm both show 5%.
Turbo pressure open cycle rating is 88% at idle, but revving to 3K shows no change. Turbo pressure shows 998Mb both at idle and at 3K. OK, from this I deduce that the turbo is not working, as confirmed by driving and it seems as if the turbo pressure solenoid valve is not working. I notice an electro valve just under the air pipe from the filter. Is this the valve? It looks very similar (but much dirtier!!) to the EV's by the RH sphere. If not, anyone know what it is? Would a faulty EGR valve give similar symptoms?? Thanks as ever, Regards

[citroenxm]

No that ev valve harry controls the butterfly just at the inlet manifold which was added to 2000 omwards models..

yes its possible that all three can be dead!! .. I would certainly NOT say its the turbo these unuts are quite a
hardy unit like ole xud units..

those ev valves dont actually click.. they are silent in operation and generally buzz silently and just get a bit warm..

[harryp]

Paul, thanks, will try the ebay one then... watch this space. Need car this Sat - holiday... most important

[harryp]

Paul, just a thought whilst I await the new valve - is there any way I can test the system by say, using a vacuum pump to see if the turbo will operate??
Cheers.

[citroenxm]

What you can try Harry is locate the tube that goes down to the turbo from the EV, and locate the Vac Pipe from the Vac pump and join them together!

The direct Vaccuum will close the wastegate BUT, when driven the wastegate will stay closed. This means then full boost will go to the engine HOWEVER... dont panic too much the ECU will detect over boost and will throw the ECU into Limp Mode. This though should be resetable by switching the engine off and starting again.

[harryp]

Thanks Paul, will try.
Been thinking(!!) - this problem only started after I changed the aircon condenser. I have only done about 500 miles since December, mostly about 1-2 miles to local shops (norty I know) and was putting the sluggishness down to a cold engine. May have dislodged something?. Have had a look, but cannot see anything obvious, all pipes secure etc, and connectors appear to be in.

[RichardW]

Given you've tried 3 EVs, seems likely the fault is elsewhere. I wonder if you have dislodged or disconnected the boost pressure sensor? Not even sure where it is.... hold on...no, service.citroen no help either really, just shows it floating in the engine bay! There is a small bore pipe running to it though, which must come off the air pipework somewhere - I don't ever remember seeing it on mine, perhaps it comes off the inlet butterfly somewhere?

[citroenxm]

Its on top of the right side.. battery side .. of the intercooler ...