 | Home > Puma (Tdci) > Engine cutting out. 2.4 Tdci 2007 |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16967   
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The VCV fits into the fuel pump and is not attached to the fuel rail. The fuel rail has a pressure sensor at the radiator end and an over-pressure relief valve (non-resettable) at the bulkhead end.
Changing the fuel rail bu itself shouldn't require a pump relearn, although I suppose if the old and new pressure sensors gave wildly different readings it might be a problem. The WSM recommends that a pump relearn is carried out after a VCV change, but the engine will generally run pretty well without (it is certainly the case that it will usually run better with a new VCV and no relearn than it was running with a faulty VCV). The engine management system on the TDCi is adaptive in that it actually runs a sort of continual learning and adaptation process on the fuel system. If you do not carry out a relearn it will eventually optimise fuel delivery anyway, but I am told that this takes longer the higher the mileage on the vehicle. The reason for this strategy is to avoid the need for carrying out a learn cycle on initial build or PDI - the vehicle does it itself. A new engine is likely to need more adaptation as it runs in than an higher-mileage engine, so the process slows down as time passes. I know of several people (including myself) who have replaced the VCV and not carried out a relearn. Initially there will be a logged DTC (pump relearn not carried out) but if you keep clearing this, after a while it will stay cleared. |
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24th Jul 2018 5:24pm |
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| Griffon12 Member Since: 24 Jul 2018 Location: Harare Posts: 2 |
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25th Jul 2018 8:30am |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3702
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Hello
Not sure if you fixed this? does it restart on its own sometimes? Mine did similar randomly, driving along then dials all go to zero....engine cuts out and sometime stopped completely others it started again a split second later... No codes to log. We thought about it logically as no codes, its not a Part beyond the ECU. If you google the symptoms on a transit van or Landy people have changed all manor of parts chasing the problem. So... New Starter relay... around £6 and 30 seconds to fit... Nope was not that it still did it. New ignition switch (bit behind the key) £20 (harder to fit) Sorted |
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25th Jul 2018 3:26pm |
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