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[davfromwigan]

just got back from holiday towing caravan with2.2 cdxdti saloon. the car towed great until i started to overtake HGV. I changed down to fourth and to my alarm the engine died and the emmisions light came on.I managed to pull over and turned off the ignition. the car restarted again, no problem, and off we went again.Again, every thing was fine until the next incline when the engine died again when i changed down.It seemed, when under pressure, the emissions light would come on and engine went off! This happened five times on our journey (wigan to taunton). the car drove fine without the caravan.the caravan is roughly 85% of the kerbweight of car so that should not be a problem. has anyone any ideas before i cough up at garage?

[TheBoy]

Welcome to the site

If the EML came on, a fault code will be stored in ECU for a while. I don't think you can do paperclip test on that car, so take it to a local garage with diangostic equip, and ask them to read the fault codes.

[TheBoy]

Sorry, I don't know anything about the 2.2 dti engine....

[tunnie]

as suggested take the car to a local garge to get the 'Fault Codes' - Once you have the fault codes post them up here and we can advise  [smiley=thumbsup.gif]

[Taxi_Driver]

I know something about a 2.2 diesel estate.

One managed to out accelerate me from traffic lights on a dual carriageway  

My only consolation is my emmsions are 'green' not the black stuff coming from his exhaust  8-)

[Taxi_Driver]

By the way, was it the emissions (piccy of engine) or the EML (piccy of car with spanner sticking thro its roof) ?

[davfromwigan]

it was the emmisions light.

[Del Boy]

as tunnie said take it 2 a garage and get the fault codes m8  

[davfromwigan]

2 errors. P0105 boost pressure sensor signal too high and P1125,boost pressure control deviation. What does this mean?

[TheBoy]

Hopefully one of the diesel experts will be along shortly, but I suspect these 2 codes are related...

[Taxi_Driver]

Had a little dig for you....

It points towards an air leak.....so check for this.

Reason being apparantly the calculated value for the air mass from the boost pressure is totally different to the value from the AMF sensor

Spose it could be duff AMF sensor

But anyway it will have these effects

Maximum performance will be reduced.
Exhaust gas recirculation valve is switched off
Boost pressure control is not longer possible

HTH

Cheers

[davfromwigan]

not mechanically minded.Whats an AMF sensor?Is it expensive?The guy from garage said try it, after renewing  software on engine management.Been out today with caravan on back, still the same problem,cutting out when under pressure towing.The car doesn,t feel as powerful as it should be.What i cant understand is: if the 2 faults are showing when tested why can nobody just mend the 2 faults?Or is it not as simple as that?

[TheBoy]

The 2 codes stored only give clues to what is wrong (after all, its unlikely that you would have 2 simultaneous problems suddenly appear)

Air leak on intake does sound feasible (check air intake hoses for splits, and that jubilee clips are all tight, esp around the turbocharger).

AMF = Air Mass Flow sensor - it measures the mass of the air passing into engine so it can decide how much fuel to put in for correct mixture (hence if you have air leak after AMF, engine management puts in less fuel thank required, which means it runs poorly, which is picked up by engine management and flags up there must be something wrong with AMF)

[Paul M]

2 errors. P0105 boost pressure sensor signal too high and P1125,boost pressure control deviation. What does this mean?

These are just educated guesses, but sounds like it's overboosting which would make sense as you were giving it full pelt with a substantial load on the engine. I've never owned a TD but had a Subaru Impreza which had an overboost detect function in the ECU to protect the engine - if the wastegate failed for any reason and the boost raised too high it would cut fuel. When tuning for higher boost levels you had to raise the overboost threshold too.

I believe the DTI engine has variable vane geometry turbo (my dad had one in a Vectra some years back) so it may not have a wastegate. However I really don't know anything about this engine so can't help further. It's probably a sensor or connection somewhere though giving a bad reading. That's the usual for these cars.

[TheBoy]

OK, I don't know much about these, but lets go through it bit by bit.

Firstly, the codes that were obtained, did they include the descriptions, or were the descriptions looked up in a table somewhere?