2.0 Hdi Problem

[safari]

HELP

 

I have a 2.0 HDI (138) manual - with a bizarre problem which can't be found - At least at the dealers anyway

 

The car drives perfectly well - throughout the gears no problems whatsoever until every 9 days whilst driving the car there is a sudden drop in power - if it were a petrol it would be like a spark plug missing - It is worst a low speeds when you need to keep the revs artificially high to keep it going and the same pulling away - it bunny hops at all speeds - one moment there is a gap in power and then it jerks and moves away - all the time the engine sounds a bit like on older diesel - i can hear tappets.

 

It happens at any speed - But I can still drive it fast it is a little more bearable at higher speeds in 6th but you can feel the car jerking/bunny hoping.

 

All this happens over a distance of about 4 miles probably just under 10 minutes - then the engine goes back to normal.

 

It does this every 9 days as I have said almost like clockwork and has done for 5 months - the dealer has put it on diagnostic testing but cannot find any fault codes whatsoever - and needless to say it never happens when they test it.

 

Any ideas???

[paul.h]

Is there anything that you do different every 9 days (driven or calendar ?) such as fill up with diesel, a particular journey, set off earlier in the day, etc ? Did it start occurring after a particular event such as a part replacement or service ?

Possibilities could include an electrical problem, fueling problem, temperature sensor, thermostat, fuel filter, water in the fuel, air filter, exhaust particulate filter, air flow meter, etc. but these are likely to give problems all the time.

[coastline taxis]

Is it exactly every 9 days or is that when you use the car and how many miles does it do before fault ocours. Could start with getting injectors checked for a sticky one

[iannez]

sounds like an injector over fueling or dripping. ask the dealer to do a leak off test.

[safari]

When I get the car serviced I will get them to check - I think the fault is mileage based as I did much higher miles last week than I normally do and it came 2 days earlier !

 

 

Can I also point out that I have noticed a slighltly artificial feel to the way the throttle works - almost like smoothing the revs - I assume this is the same as all cars - as if they have tuned the throttle to be very smooth - but it feels sometimes as if that affects the cars power as you move through the gearbox - when it nears the time when the fault occurs - it feels even more artificial. Before the fault occurs as well turbo lag increases too.

[Randombloke]

I have a gut feeling this might be a crankshaft position sensor problem.

 

Sometimes they go slightly high resistance...... had problems like this on at least one car and one motorcycle....

[safari]

Had my car serviced at Citroen yesterday and asked them to investigate the problem - finally they found it - I need a new MAT (Manifiold Air Temperature) Sensor. £73 fitted. Hopefully this should cure it! I will report back!