Phil Posted February 19, 2008 Share Posted February 19, 2008 Morning, all, my very reliable '02 110 has twice misfired on first starting when the weather's been cold and damp. The problem clears pretty much as soon as the throttle's opened and the vehicle runs normally thereafter. Not a big issue I know, but since it might be a sign something's failing and/or easily fixed I thought I'd ask if anyone can suggest what might be wrong? Thanks, Phil. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted February 19, 2008 Share Posted February 19, 2008 It is most likely just the misfire caused by the fact LR chose to put four glowplugs in a five cylinder engine, so in cold weather on the first start of the day, they often run like a bag of bolts for the first few seconds until the fifth cylinder catches - basically the engine is running on four cylinders till the heat from the compression strokes is enough to make number 5 ignite without glowplugs. No I don't know why they only fit four glowplugs before you ask... Quote Link to comment Share on other sites More sharing options...
Phil Posted February 19, 2008 Author Share Posted February 19, 2008 BM, thanks, that would certainly account for it; how odd to have one fewer glowplug than cylinders! Still, it sounds like it's just a 'feature' which puts my mind at rest. 'Bag of bolts' is certainly the right description...... Thanks, Phil. It is most likely just the misfire caused by the fact LR chose to put four glowplugs in a five cylinder engine, so in cold weather on the first start of the day, they often run like a bag of bolts for the first few seconds until the fifth cylinder catches - basically the engine is running on four cylinders till the heat from the compression strokes is enough to make number 5 ignite without glowplugs. No I don't know why they only fit four glowplugs before you ask... Quote Link to comment Share on other sites More sharing options...
alantd Posted February 19, 2008 Share Posted February 19, 2008 My old Td5 used to "roar" for the first 30 yds on a cold day. It was a completely different induction noise and sounded like I'd suddenly inherited a V8 (no bad thing). It used to disappear by the time I'd got to 2nd gear. I wondered whether this was related to it being one glow plug short of a set but it acually sounded smoother! I guess it was completely unrelated. Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted February 19, 2008 Share Posted February 19, 2008 My old Td5 used to "roar" for the first 30 yds on a cold day. It was a completely different induction noise and sounded like I'd suddenly inherited a V8 (no bad thing).It used to disappear by the time I'd got to 2nd gear. I wondered whether this was related to it being one glow plug short of a set but it acually sounded smoother! I guess it was completely unrelated. mine did too.... it sounded like the viscous fan was being powered. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted February 19, 2008 Share Posted February 19, 2008 mine did too.... it sounded like the viscous fan was being powered. That is exactly what it was. The viscous fans on Td5s take a while to "unstick" if they have been sitting for a while. If it lasts for more than about 30sec there is something wrong with it, and they do seize completely so they make a hell of a noise all the time, sap the engine power and waste lots of fuel. On the plus side it sounds somewhere between a 500hp V8 and an angry meat-eating dinosaur when you give it some beans B) Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted February 19, 2008 Share Posted February 19, 2008 Have you tried lowering the suspension.? Apparently, we are told this and a few tweeks will see you blasting Audi S4 with a 4.2 V8s and other exotic supercars completely into the weeds Oh my coat... Ta Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted February 19, 2008 Share Posted February 19, 2008 Have you tried lowering the suspension.? Nah.... don't fancy fitting orange springs, Quote Link to comment Share on other sites More sharing options...
bulletmp Posted February 20, 2008 Share Posted February 20, 2008 As long as it goes away in 30 or less seconds then it is ok, the reason for no 5 cylinder not having a glo plug is because of to fuel pressure regulator sitting at no 5 cylinder. Just for my own interist what does cold mean Phil in celcius please because where I live cold is 18deg celcius. Quote Link to comment Share on other sites More sharing options...
Phil Posted February 20, 2008 Author Share Posted February 20, 2008 I've noticed the misfire when the temperature's dropped to around minus 6C or below, and it's been damp. On both occasions it's cleared as soon as I've touched the throttle and the engine thereafter runs smoothly. Cheers, Phil. Quote Link to comment Share on other sites More sharing options...
alantd Posted February 20, 2008 Share Posted February 20, 2008 That is exactly what it was. The viscous fans on Td5s take a while to "unstick" if they have been sitting for a while. If it lasts for more than about 30sec there is something wrong with it, and they do seize completely so they make a hell of a noise all the time, sap the engine power and waste lots of fuel. On the plus side it sounds somewhere between a 500hp V8 and an angry meat-eating dinosaur when you give it some beans B) Well b*gger me - of course! I didn't consider the viscous fan but obvious now you mention it. And there was me thinking I might actually have 500 horses at startup Quote Link to comment Share on other sites More sharing options...
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