 | Home > Puma (Tdci) > 2.4 low on top end power |
 
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20318  
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Might be worth checking your turbo actuator is working and that your MAF and MAP sensors are clean. The latter in particular.
There is the VCV too, but I would check the above first as a matter of course. Even if it is fuel related. Checking these things can do no harm. ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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24th Dec 2019 5:08pm |
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| mata Member Since: 24 Jan 2014 Location: Manchester Posts: 153 
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Thanks for the suggestions, the MAP, MAF and turbo are all under 18 months old and given the suggestion of fuel supply I’m currently focusing on that. Since the new fuel pump I’ve been draining the fuel filter every time I fill up and this morning I noticed that instead of the usual fairly free flow from the drain it was a much reduced flow with a fair bit of water, two or three times the usual half thimble full. I’m wondering now how to test if there’s a restriction pre fuel pump. Easy thing to do I guess is put (another) new fuel filter on and see what happens. I think I’m perhaps gong to have to drop the tank and inspect the pick-up ...
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25th Dec 2019 2:47pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17360 
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If you've found water in the fuel then it is almost inevitable that you will need to change the VCV, at least once you have sorted out the water issue.
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25th Dec 2019 4:22pm |
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| mata Member Since: 24 Jan 2014 Location: Manchester Posts: 153
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Should I expect to drain no water out of the fuel filter drain, ever; what is typical?
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25th Dec 2019 5:09pm |
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| mata Member Since: 24 Jan 2014 Location: Manchester Posts: 153
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One of the few references to my fault code (P2635-07) with reference to a tdci Defender found on google is another post here on Defender2 https://www.defender2.net/forum/topic14143.html Forum member Lorryman100 worked on a friends Puma with fuel starvation symptoms which I believe I have also - although he noted there was no stored fault code. Turned out there was crap in the fuel tank, tank to filter pipe and filter and a clean out restored the vehicles performance.
I’ve found small bits crud in my new filter coming out the drain with cloudy diesel so it appears I’ve got an underlying issue with crap getting into my fuel tank from somewhere, or this could be perhaps left-over from before I replaced the split filler pipe and adjacent breather (with the updated pipe). Either way this could be what saw off the fuel pump recently. Long journey home tomorrow, fingers crossed. Tank out asap for a clean and inspection (I’ve read someone recommending new seals on the pickup unit to tank joint), change the other breather on the near side and maybe there will be a partial blockage or clogged filter from diesel bug sludge or accumulated crud that’s causing the problem which I can clear. |
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26th Dec 2019 5:08pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17360
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This ^. If you have crud in the fuel you will end up replacing the VCV. |
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26th Dec 2019 6:28pm |
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| mata Member Since: 24 Jan 2014 Location: Manchester Posts: 153
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Thank you Blackwolf, I’m familiar with the VCV foibles and have replaced a few in my time.
Would be great if you could help with my question regarding amount of water from fuel drain, should a healthy system expect zero water from filter? |
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26th Dec 2019 7:13pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1777  
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Virtually any system will have some water collect in the filter, IIRC Lorryman did a thread on here about installing an additional water separator, but regular draining should sort normal contamination.
There is a well known TDCI fault where the tank breather rots and allows water into the tank from the left hand rear wheel arch, might be worth checking. HTH Keith |
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26th Dec 2019 7:24pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17360
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A very small amount of clean water shouldn't be a problem. I change my filter once a year and there is seldom any noticeable moisture in it.
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26th Dec 2019 8:24pm |
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| mata Member Since: 24 Jan 2014 Location: Manchester Posts: 153
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Six months ago I had a puddle of diesel under the car following a fuel stop so swapped out a perished a split breather hose and did the adjacent filler hose also. At the time I wasn’t aware or the other breather exiting the near side (left side) of the tank so this is likely also perished. The crud in the tank could perhaps be residual or my concern is that it’s still compromised; either way the only solution I can see is to remove, inspect and remedy. What I’m not 100% sure on though is that my symptom of low top end power and ecu fault code for low fuel pump flow/ performance are definitely down to the sorry state of the fuel Coming out my tank. Common sense says they are but I’ve found almost no one reporting such a situation while searching here and elsewhere online.. In the last week I’ve also replced the intercooler hoses for BAS silicone ones due to a slip in the original... |
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26th Dec 2019 8:36pm |
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| mata Member Since: 24 Jan 2014 Location: Manchester Posts: 153
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Just sometimes i find a thread on here where someone has had an issue and posted a follow-up post when they've got it sorted. I can't say ive sorted this out yet but perhaps my continued posting will one day be helpful to someone.
So i had the tank out which was covered in mud and i was convinced that i had found my source of bad fuel!  Click image to enlarge However, once stripped down very little detritus was found in the tank so i can only assume its residual crapfrom before my breathers were replaced. It was then reassembled with new components , smoke tested and all checked out fine. Click image to enlarge I took the opportunity to clean up and put some dinitrol on the body and top of the rear cross-member which have been inaccessible when its been in for treatment. Pretty horrible how much mud was sitting up there. Click image to enlarge I smoke tested the fuel lines which were fine, primed it with my modified ebay priming tool and it burst into life straight on the button. Unfortunately the issue of lacking top end power remains but it's not an issue with fuel supply to the pump. The local specialist Martin at Landranger Services Stockport suggests its probably in need of ECU calibration. I did a fuel pump learn back when the new pump was fitted 700 miles ago and though the job was done as power initially was strong however Martin suggests without a pilot learn the fueling can get worse over time, as mine has. I think he said it might also need an injector learn too. I tried a pilot learn with my crappy Foxwell computer but the on-screen instructions are terrible and it took a few goes before i realised i had to let one of the processes run for a few minutes where the engine rpm and engine tone/noise fluctuated around before becoming stable. The initial drive out to the motorway was very encouraging with the engine feeling more on point and strong but 6th gear pulls from 60mph showed the issue remains. |
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9th Jan 2020 7:23pm |
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