 | Home > Td5 > Defender miss fire |
 
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 75   
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Problems started with poor starting,so had a small amount of oil at the red ecu plug,this was cleaned and the injection harness replaced,still no joy. Next injectors o rings and copper washers replaced, still no joy. Next glow plugs replaced,still no joy. Next once it's running I found that the relays under the drivers seat they click and there's a misfire and a puff of smoke from the exhaust and the engine warning light comes on but only for a second. Once the engine is hot the problem goes away. Next replaced the glow plug relay and I have added an extra earth cable from the battery to the earth point under the drivers seat. Any ideas what to try next lol
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1st Jan 2021 1:25pm |
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 75
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Am thinking the crankshaft is ok as once the engine is warm enough it runs ok, it's only once the weather got cold that the problem started. I was thinking it's a glow plug problem but new glow plugs and relay and it still miss fires every 30 seconds but only for a brief moment and that's when I can feel the relays click. So am at a loss what's causing the problem.
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1st Jan 2021 3:51pm |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039  
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I don't think it is glowplug related as a td5 will start without glowplugs normally.
As you did the injector seals already it might be the fuel system. When was your fuel filter changed? Roel 1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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2nd Jan 2021 3:18pm |
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 75
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All oils and filters changed 3000 miles ago also a new maf sensor at the same time. Just been looking at the truck this afternoon, it starts ok but about every 30 seconds while it's cold and just ticking over it miss fires as it does this I can hear the relays under the seat click and the temp gauge jumps to the right only for a split second then the engine warning light comes but only for a second before going out. I have wiggled everything I can think of to see if it's a loose connection but no joy. Once the engine is warm it drives ok grrrrrr lol very frustrating.
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2nd Jan 2021 4:15pm |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039
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Temp sensor connection?
Or ECU earth? Earth behind the dash? But then why only when cold? This is a difficult one. Roel 1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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3rd Jan 2021 1:58pm |
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 75
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As this problem only happens when the engine is cold I thought " glow plugs " I have disconnected the glow plug relay and the miss fire still happens. I have ordered a crank position sensor so I will try that next week lol.
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3rd Jan 2021 3:27pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4786 
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Sounds like a dodgy main ECU relay to me. Might be worth trying a different one for good measure to see what happens
 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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3rd Jan 2021 3:59pm |
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 75
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An update, changed the crank position sensor today and it's made no improvement so I still have miss fire but only when the engine is cold. I unplugged the inertia switch on the bulkhead and the engine cut out straight away, once reconnected the engine fired up ok so I would assume that it's not that causing the problem. Every electrical connection I have looked at is clean and appears to be good, ??????????
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9th Jan 2021 1:53pm |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 942  
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Have you tried swapping the ECU with known working unit? 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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9th Jan 2021 3:41pm |
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 75
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Not tried that yet. The thing is this miss fire only happens when the engine is cold grrrrr. Am thinking now to get someone to plug in a diagnostic computer to see what fault codes are there as I am at a loss to what's causing the problem
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9th Jan 2021 4:35pm |
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| mark1200 Member Since: 09 Oct 2011 Location: peterborough Posts: 75
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quick update, had a computer pluged in and theres no fault codes at all ????? so its now going to have to go to a landrover garage to let them fix it
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8th Feb 2021 7:34am |
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| Julie Member Since: 07 Oct 2017 Location: Nantes Posts: 499  
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Do you still have your EGR ? If yes, it could be sticky. If it's in the wrong position (open), you'll have problems only on a cold engine |
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8th Feb 2021 7:17pm |
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| stinus Member Since: 12 Jul 2020 Location: Kapellen Posts: 12  
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Try this one, it's a quick and easy check on the relais. They may look good, but can fail after a few decades. Also make sure they fit well in the base sockets. Renewing the underseat relais' fixed my occasional misfire and temperature gauge to red issue. |
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9th Feb 2021 8:00am |
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| derbywill Member Since: 25 Mar 2010 Location: Derbyshire Posts: 559 
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Is it not a continous mis fire when cold, more like it just 'Miss's' every now and again when cold?
Cheers Will 2005 90 XS 1954 86'' Series 1 tilt 1968 88” 2A 200tdi 2002 110 Hardtop |
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9th Feb 2021 12:44pm |
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