Do you want the Road Tax system to change? Do you have thoughts on the potential changes to the Road Tax system? | No thanks

Why is my Vauxhall Combo van losing power?

Please could you advise what to do about a new Vauxhall Combo SE 1.3 van I bought in May 2010? It is hesitating and losing power, and our local dealer can't detect a fault.

Asked on 5 September 2010 by madamchocolat

Answered by Honest John
Probably the diesel particulate filter. The DPF on this engine is very prone to choking if the vehicle is repeatedly used for short runs from cold starts. The DPF is supposed to gather unburned hydrocarbon particulates on start up, then burn them off later in the vehicle's journey. To make this happen the engine periodically cycles extra diesel into the combustion chambers. But if the DPF never gets a chance to burn off the particulates it clogs up to a point where it can't regenerate and the extra fuel sinks to the engine sump. So check the sump level. if it gets too high, because the engine is compression ignition, it can start to run uncontrollably on its excess sump oil. If you can manage to take the van for a 50 mile run at more than 2000rpm there is a chance that the DPF can regenerate.
Similar questions
My postman tells me that Royal Mail recently took delivery of new Fiat vans fitted with diesel particulate filters. Now postal workers on suburban stop-start 'walks' are sitting revving the engines to...
It is now time to change from my nine-year old BMW 525 diesel. I am retired and do about 4000 miles per year. I do lots of short journeys of around seven miles, with very occasional longer trips. The dealer...
I was interested to see that you think the Qashqai 1.6DCI would be suitable for an annual mileage of 8500 with only two 20 minute regular journeys per week. I am thinking of replacing my X-Trail with a...
Related models
Commodious yet compact van based on a stretched Corsa platform, decent to drive, one Combo van recorded 505,000 miles.
 

Ask Honest John Right column

Value my van