My Vivaro would run for a few weeks perfectly, then it would play up, it would take 10 seconds for the throttle to work, run very roughly until 3k revs then would take off like a scalded cat.
Finally I realized that the van suffered very badly from water (Rain and windscreen washer) getting under the bonnet and wetting the engine.
I believe this is the biggest cause of faults under the bonnet
Check your turbo boost sensor, Its the "windscreen washer" looking unit with 2 rubber pipes coming of it, If the pipes come from the top it is upside down, and water is in the filter of the boost sensor, Mine was fitted this way by a garage, and I have fitted 3 new ones,
Water drips directly on to the top of it, water does get into the unit
The cap on the unit unscrews, inside there is a foam filter, 10 to 1 it is wet, (I have squeezed a teaspoon ow water from mine)
But to stop any further problems you MUST SEAL THE ENGINE COMPARTMENT
I sealed mine this weekend, a fairly long but inexpensive job and even after the very heavy rain this weekend there is no water on my engine, and my van runs, at 80,000 miles as well as the day I bought it (at 5000 miles)
I will cover the seal procedure soon,
Posted Jul 31, 2013 (11 years ago)