 | Home > Td5 > TD5 occasional momentary cut off - fuel pump? |
 
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443   
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Check the relays under the seat for poor connections, leave it on tick over and give them a wriggle.
Mine did a similar thing the other week and it was the wires to the crank sensor but I suspected them straight away as I'd been working in the general area, I had changed the fuel pressure valve for a rebuilt one and the boy had been helping. We had also taken the air box off to cut out the cyclone thingy so it was highly probable that between us we had disturbed a previous bodge repair I had done after I swopped the engine last year. Others might have some ideas but I'd hazard a guess on a poor connection at the fuel pump relay. |
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7th Aug 2019 10:20pm |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 898  
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Agree with JWL... check electrical
 first, crank sensor wiring can be dodgey on high mileage Defenders. Then... plug it in see if there are any codes. Before you go crazy and pull the FP look at changing your fuel filter as well.
Good luck 2010 Range Rover MkIII Autobiography Super Charged (Idris) 2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) |
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8th Aug 2019 3:13am |
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| M2Tarmac Member Since: 26 Feb 2018 Location: Hampshire Posts: 5  
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Hi guys,
Thanks for the replies. The mileage isnt very high (110k) but I will check the relays and check codes. I also suspect the fuel filter; the housing is in an awful state and I was about to replace it as it looks pretty grim against the new galvanized chassis. Any tips on the best kit to buy to read the codes? |
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8th Aug 2019 6:36am |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5417 
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Check battery terminals and assume ignition all feels ok.
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8th Aug 2019 8:27am |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2069 
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Nanocom.
+1 on dodgy crank sensor wires Instagram @defender_ventures Empire Tuning - Agent |
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8th Aug 2019 9:19am |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 898
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Nanocom is the one to use but a tad pricey. A cheap alternative to just read codes, clear and see live data is the iCarsoft 930. 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) |
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8th Aug 2019 10:32am |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1568  
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Very unlikely a code reader/diag machine will help on this fault before you waste your money- that’s my honest opinion
Does it do this under any particular set of temperatures/time of day/driving circumstance? eg high speed/low speed, revs, uphill/ under load etc |
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8th Aug 2019 4:10pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2069
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Well if the crank sensor or wiring has gone then yes diganostics will tell you so...
My 110 cut out in traffic then was fine. Cut out again shortly after, turned out to be a bad connection on the crank sensor. Fault logged in the nanocome as high speed crank error Instagram @defender_ventures Empire Tuning - Agent |
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8th Aug 2019 4:13pm |
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| M2Tarmac Member Since: 26 Feb 2018 Location: Hampshire Posts: 5
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Thanks guys; there isn't a clear pattern of when it happens. Mostly over bumpy roads though, which made me think of a poor connection somewhere. It also happens when coming off idle or trailing throttle. It doesn't completely die, no more than a hiccup, but it is a definite momentary cut out.
Are the fuel pumps reliable? |
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8th Aug 2019 4:17pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2069
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For the most part yes. Seen them fine up to 200k+ but also seen them die at 50k.
Do you loose all dash lights etc as well? Instagram @defender_ventures Empire Tuning - Agent |
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8th Aug 2019 4:20pm |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1568
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Not necessarily on an intermittent fault.
The only thing you will get a reading with on a crank sensor on a Td5 is an oscilloscope, you can test the wiring continuity with a meter, but not the actual sensor- it’s too quick. But I’ve only been working on them professionally for 20 years everyday- so what would I know  |
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8th Aug 2019 4:23pm |
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| M2Tarmac Member Since: 26 Feb 2018 Location: Hampshire Posts: 5
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No dashboard issues at all.
So, should I bother with the code reader? Oscilloscope sounds outside my skill level! |
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8th Aug 2019 4:41pm |
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