 | Home > Td5 > Surging and hesitations |
 
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2168  
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Had it on diagnostics? Instagram @defender_ventures
Empire Tuning - Agent |
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8th Feb 2020 3:44pm |
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| Dexterdog Member Since: 23 Jun 2018 Location: gloucestershire Posts: 108 |
No, not yet. When they remapped it there were no fault codes present.
Sorry for my ignorance, would diagnostics have to be ran when its cold as thats when the problem is most present ? |
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8th Feb 2020 3:55pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6092  
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Water temp sender?
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8th Feb 2020 4:03pm |
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| benniferj Member Since: 20 Oct 2016 Location: Basingstoke Posts: 361 
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Who remapped it?
How can they have remapped it if the engine wasn't running properly in the first place. I would question the professionalism of whoever did that. And maybe slightly more productively - when you first turn they key but before starting, I take it you hear the fuel pump at the back of the car run and whir. Do you hear any odd sucking noises and under the bonnet do you hear the fuel pressure regulator (near the coolant bottle) make any odd noises? What kind of condition is the fuel filter housing in under the back right wheel arch? Any signs of weeping? You say the filter was done recently, did you do it yourself, can you confirm it's properly sealed on? Did the problem exist before changing the fuel filter? I am suggesting air leak/weeping fuel system. |
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10th Feb 2020 10:24am |
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| Dexterdog Member Since: 23 Jun 2018 Location: gloucestershire Posts: 108 |
Hi,
I guess the remap was fine because the engine was warm when they did it ? Fuel pump noise normal when starting. Fuel filter assembly has no sign of leaks - I changed it myself. Problem was there before and after fuel filter change I will have a listen to the fuel pressure regulator to see if it makes any noises. Is that something that would effect the engine only when cold ? |
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10th Feb 2020 5:23pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8030  
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Does it idle smoothly on start up?
Is it engine temp related or engine run time related. If its left for 2hrs does it do it left 6hrs does it do it? Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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10th Feb 2020 7:10pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843 
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Injector seals? 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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10th Feb 2020 7:10pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8030
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Sorry forgot to add, is that age not in the fuel filter housing cracking range? Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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10th Feb 2020 7:10pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6092
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try swapping in a spare ECU and see if it's software (or ECU hardware) causing it.
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10th Feb 2020 7:19pm |
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| Dexterdog Member Since: 23 Jun 2018 Location: gloucestershire Posts: 108 |
Hi,
When you start it it ticks over really smooth, no lumps or bumps or hunting through rev range. Its only when you drive it you get the flats spots and hesitation which then clears if you push it harder until its warmed up. I hadnt actually paid much attention to whether it makes a difference if engine running time is what makes a difference or if engine temp makes a difference. Tomorrow I'll leave it to tick over for 5 mins then drive it and see if it makes any difference and will report back. Would the injector seals or fuel filter housing cracking make any difference between the engine just started and once its warm (sorry for ignorance). Its definitely much much better (hardly ever notice anything after a couple of miles) Thanks for giving it some thought for me |
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10th Feb 2020 9:39pm |
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| Enid_Puceflange Member Since: 25 Oct 2014 Location: edinburgh Posts: 1172  
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Watching this
I too have the same issue on a late 2001 TD5 (p15?? I think the engine is) Serviced recently Injector loom replaced Run injector cleaner last couple of tanks of derv, made it slightly less frequent Certainly didn’t cure things My confidence has been writing cheques that my abilities can't cash for years. |
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10th Feb 2020 11:51pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5707 
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I would stick a new MAF sensor on if it were mine.
Try running yours with it’s MAF disconnected and see if it improves things. |
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11th Feb 2020 7:54am |
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| Dexterdog Member Since: 23 Jun 2018 Location: gloucestershire Posts: 108 |
Quick update.
MAF sensor has been disconnected to see if that makes any difference and its still the same. In answer to the question is it the length of time the engine runs for that solves it or engine temp........ I let it tick over for 10 mins today before driving it. Temp gauge in the blue after 10 mins as had just been ticking over. Drove it and still have the same problem. So the issue goes away when the engine gets up to full running temp and is not dependent on length of time engine has been running (if just ticking over). Started it again after 3 hours and it was present less but still noticeable when first driving it. All seems to suggest the engine temperature being at full running temperature is what makes it go away. Also listened for sucking / slurping / unusual noises around fuel pump and around engine bay around fuel regulator and there are none I can hear. Any other ideas please? What might make it hesitate when the engine is cold. It definitely reduces the hotter the engine gets until is virtually unnoticeable when temp gauge in middle at full running temp. If you drive it hard when cold it will "clear" but as you lift off and drive gently again it hesitates until you give it more throttle again and so you get hesitation / surging which reduces as you get nearer to full running temperature. |
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11th Feb 2020 3:55pm |
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| Dexterdog Member Since: 23 Jun 2018 Location: gloucestershire Posts: 108 |
Hi Chaps,
2001 TD5 defender Things have moved on a bit but still have the problem. Update is Car started missing and hesitating only when engine temp cold. Once got up to temp ran fine. Now its missing and hesitating more significantly. Sometimes kangarooing. Now does it not only when engine cold but definitely does it more when it is cold . It does not do this all the time. Does it intermittently and only under light acceleration. Drive it like you stole it and it goes like stink and is really sweet. Will sometimes run perfectly for a few miles but then starts playing up again. The key issues is its only when accelerating lightly that you can have the problem Actions so far: Had oil at red plug (not loads by some pics I have seen) but not in ecu. Changed injector harness. Cleaned plug MAF changed Wastgate is moving OK EGR blanked ECU checked and is OK Has stage 2 Alive remap - mapping checked by Alive (at same time as ECU) and is OK Garage said I have unrelated fault codes that wont clear (air con for example even though dont have air con) and suggests this means either ECU (been checked) or oil in engine loom. So the question for all you wise chaps is does that sound correct ? When it does it (not always), once you go past the light acceleration hesitating and drive it hard then it clears and goes really well (but starts again when you lift off). That to me seems like you are "passing" the problem which in my mind does not seem to correlate with signal interruption by oil in the loom. Otherwise would it not do it all the time under any level of acceleration? Any helps please |
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19th Mar 2020 9:50pm |
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