 | Home > Puma (Tdci) > VCV and the learning |
 
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| keef9t Member Since: 13 Mar 2016 Location: manchester Posts: 170   
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Update.
Not fitted the new VCV yet. Reason - I gave the MAF and MAP sensors a good cleaning with Electrical Contact Cleaner along with an extra shot of Millers in the tank. Running very smooth at the moment. So, for the time being I will leave things alone. |
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4th Oct 2018 8:44pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4208 
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Vcv is on the back of the fuel pump. Think it has a grey connector to it. You can see it if you look under the inlet manifold. 2007 110 TDCi Station Wagon XS
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25th Oct 2018 7:47am |
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| williamthedog Member Since: 29 Dec 2012 Location: south wales Posts: 3441 
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Held on with 2 cap head bolts, 5mm if I remember correctly. You can change without removing anything else. About a 30 minute job all going well. Remove the connector on the valve when you've undone the bolts, alot easier.
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25th Oct 2018 8:49am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8021  
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thank you both, much appreciated, am looking to remove it and see what the piston looks like, dont have the facilities for a relearn so hoping if new one goes in it will sort itself out. Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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25th Oct 2018 12:41pm |
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| Trussy047 Member Since: 17 Jul 2019 Location: Wisbech Posts: 8 
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Out of interest, how did you get on?
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23rd Jan 2021 3:15pm |
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| keef9t Member Since: 13 Mar 2016 Location: manchester Posts: 170
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In my particular case, I replaced the VCV without the "learning". It ran fine afterwards and has done ever since. I never bothered to look at the old one for "scoring" etc.
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23rd Jan 2021 7:43pm |
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| Trussy047 Member Since: 17 Jul 2019 Location: Wisbech Posts: 8
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Happy days, I’m in the middle of replacing the glow plugs and inlet manifold and thought I may as well replace the VCV while I’ve got easy access. Hopefully, I’ll get away with it.
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23rd Jan 2021 8:10pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20342
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You don’t need any learning process with the VCV. Just swap over.
When I did mine last year, it did indeed have some scoring but was at least ten years old so can’t complain! The new one was a quick fit and forget and is running lovely now. $W33T $0U7H3RN $UG4R 🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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23rd Jan 2021 11:34pm |
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| Minch90 Member Since: 15 Sep 2017 Location: Gloucestershire Posts: 236
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That’s a bit of a knuckle scraper that job, especially as I thought I’d use the new screws from PFJones, which were too long so had to remove and put the old ones back
Drives very differently straight away, valve looked original (not put 12v across it to see barrel), much more freely revving 👍 2.4TDCI 90 - everyday brilliance S3 V8 Lightweight - in the garage being ignored #newchassistime S3 lightweight - 2nd car 24V fire risk with a full tilt and the windscreen down S1 80" - first car fun - 75mph in neutral downhill once #wobblesallround |
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6th Feb 2021 6:20pm |
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| dazzling1611 Member Since: 08 Jun 2020 Location: morpeth Posts: 35 
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ive just replaced the vcv because of huge amount of diesel smoke and engine knocking , found it was stuck open and was running at 500 bar at idle when i checked live data on the Autel.
It didnt change anything on start up with the engine still loads of smoke but the idle pressure back to normal now, 240 bar at idle, to cut a long story short , i found all four injectors had blown due to the high pressure and had replace all of them. So if your experiencing rough idle and have high fuel pressure you need to replace the. vcv and check the injectors . I did a relearn on the vcv after it had idled and warmed to to check the difference. |
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13th Feb 2021 8:09am |
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