What causes Vauxhall frontera diesel occasional misfire?

Answer 1

Probably find its somethin to do with the injectors. I would try and clean the injectors. If you remove the fuel filter (which should be attached to the bulk head) and replace it with a new 1 but before putting the new one on buy some Diesel Injector Cleaner should be around £7 for a bottle. tip this Injector Cleaner directly into the fuel filter and screw it on to the carrier. If you have a diesel primer, manually prime the filter until it gets really hard to push/squeeze. You then know the filter is full. Start the engine and let it run for 2 to 3 mins if it cuts out prime it some more (should be soft again). Once you've done that it should tick over okay. Now you need to give you car a blast up the nearest National speed limit road there is to force the cleaner through which might smoke a little to start with but once you've done that for 5 mins or so, you should be Missfire free providing it is the injectors and if it still missfires the chances are it could be a faulty injector valve which would require a replacement of all injectors. Hope this helps