Nuevo loss of acceleration in wet conditions

New to this but has anyone else experienced the problem of loss of acceleration while driving in heavy rain, 2003 Nuevo ES, HDI . After drying out and use of water dispersal spray  the problem seemed solved but I am worried that this may happen again. Anything that I could do to avoid this happening in the future would be useful!

It sounds like your turbo is not kicking in because of a damp or wet connection. Diesels usually don't suffer electrical problems but the MAF connection might be getting damp and shorting out the turbo switch. http://www.bavariandominator.co.uk/pages/peugeot_maf_sensors_123427.cfm

Not sure where the connector is located but have a look at what they look like and you might find it.
 
PS that's the limit of my knowledge but don't think its a serious problem just a loose or damp connection, good luck in tracking it down and keep us other Nuevo owners up to date. Jim

I've been told by my mechanic (I'm waiting to collect my new-to-me 2006 Nuevo) that they suffer from wiring loom problems. Not knowing whether yours is on the old boxer or the new x250, I've found this on the caravan club forum regarding a cover over the injectors which might be the answer......

http://www.caravanclub.co.uk/community/discussions/technical/motorhomes/Peugeot-Boxer-Engine-Compartment-Water-Ingress/rt/309653/

The drying out and water dispersal spray may have been effective, but it may also be a red herring. It sounds like the van went into "limp home mode", and generally if you turn off the engine, limp mode is cancelled anyway, so next time you start you should be back to full power again until the fault re-occurs.

As above, it's probably a sensor/actuator problem, but unless you get the engine management fault codes read you are just guessing. The ECU should store old error codes, so you can access them at a later date (i.e. they generally have to be manually cleared). Rather than take it to a main dealer (paying maybe £50 for very little effort on their part) you should be able to find a local auto electrician that will come to you with a code reader and do it for less.

thanks. 
At the time the AA were unable to find the fault using their diagnostic computer and after the vehicle was up and running again the garage that I visited as a precaution said the same.

Was it a Peugeot garage?

You may be aware of this already, but the problem with commercial vehicles/base vehicles is that the standardisation of the engine management interfaces did not come in until way after it did for cars - a 2006 van may well be proprietary and unreadable to a standard (OBDII) reader.

This can be extremely annoying for owners of vans made in the "in between" period when ECUs became common but standard interfaces were not. The Mk5 Fords are like this, and many Ford dealers are unable to read the codes on them because they have disposed of their diagnostic equipment for that generation of ECUs!