(T) JTD Multiwagon - unknown engine fault

Have a diesel Stilo Multiwagon, its been an excellent car from new, now has 91,000 miles on it. Recently when accellerating firmly at around 2500 revs engine fault indication lights sometimes comes on, then normally goes out.
Occasionally engine power drops significantly, which can be embarrasing when passing a wagon etc. Been to Fiat garage locally, run tests and found nothing, anybody any ideas what the cause can be, its happening more often, recent full service made no difference.

Hi boilertrol,
Welcome to the forum, have a search for "crank sensor" and have a read of other peoples symptoms to see if they match yours.
minimad99

Ive got the exact same behaviur.. Searched the forum for crank sensor, but none of the post match the symptons.

The fault comes most of the time when the car needs a little more power. E.g. on the motorway just after you go out to overtake a car you press to accellerate and then sometime the engine fault sign lights and goes out again. The fault just comes on, without the engine loosing power.

I've had the engine fault read with an examiner and it says turbo preasure unexpected (or something like that). The funny part is that there is 3 possible fault codes. Turbo preasure too high, Turbo preasure too low and the last Turbo preasure abnormal... I would think that either it is too low or too high.
Any thoughts?

/Thomas
Fiat Stilo 1.9 115 HP Diesel 2003 200.000 km.

Guys, have your intercooler pipe checked. Things to look out for is a hiss from the engine bay sometimes accompanied by a good bit of smoke. My reader (& the dealer one) did not report this fault in isolation, just turbo fault.

These pipes have a habit of wearing through on the understray apparantly.

Hey Bozzy,
Thanks for that reply, is the intercooler pipe the oval shape hard plastic pipe that is quite wide?

Courtesy of Argo

Thanks both of you. A picture says more than a thousand words..

I'll try and have a look under the car to see if it looks faulty.

Just to clarify its the right pipe on the picture, all the way from the top where theres a rubber pipe down and along the hard plastic pipe?

No; it's the left one. Runs from turbo to intercooler but runs very close to bulkhead which I understand causes damage from constant rubbing.

The tubing FROM the intercooler to carb/manifold seems to be made of a much harder plastic and from what I can gather no one has reported any problems with this yet.

Not had any issues myself but Bozzy has had first hand experience of the problem

It is the pipe on the left. The sections that fail are the short rubber pipe section you can see, and also another short rubber pipe section at the other end of the metal section, where it goes into the intercooler.

hmm.. been checking the entire pipe from the metal housing where it is attached to the motor down and out to the side of the car, and everything looks ok. The rubber is not old or crumbling and there is no holes...

I've been reading about the overboost valve, but my issue is not related to bad weather, the error is also present after a week of sun where all water should be gone.

i had the same problem really annoying. try unplugging your maf sensor and taking it for a run the car goes back to defaults. if that does it get ur self a new one. got mine the other day for 96 quid from partco

Sounds a bit like overboost problem. Have you carefully checked tubing for signs of splits either side of valve? Valve itself can always just go faulty of course.

Just a guess but MAP (rear of engine) sensor might be worth a check.

Possibly EGR sticking open.