 | Home > Puma (Tdci) > White smoke on start up - diagnostic breakdown required |
 
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324  
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Thanks Nick.
I might be able to make something with what I have here, interesting wee challenge, I'll try not to make something that fools me ! Is this normally done with coolant above thermostat temp, normal running or cold? And yes cap is on the list, I'm just waiting for bits to accumulate past the threshold of making the postage worthwhile  Solved the bowel problem, working on the consonants... |
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15th Sep 2016 7:18am |
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| B4Lamb Member Since: 21 Mar 2015 Location: Abergavenny, Wales Posts: 233  
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If true that a single glo plug is 0.6 Ohm then measuring the set of 4 in parallel as they are connected in the wiring harness the measured resistance should be 0.15 Ohms. It would be difficult to measure anything this low with a general purpose multimeter. It will almost read like a short circuit. Probably better to measure each one in turn and check they are all about the same. Probably better to measure the current taken by each one in time for a better comparison. If they are 0.6 Ohms they would each draw around 20 Amps but I suspect as they heat up the resistance increases so that current will drop very quickly. Ill do a few tests in the next few days and provide an update on here. John "You are never to old to learn something new" |
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23rd Jan 2017 10:42pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
measuring the resistance one at a time i.e. one glow plug at a time as 0.6 ohm each as resistors in parallel 1/2 prolixly and resistors in series add up i.e. 0.6 + 0.6 + 0.6 + 0.6 = 2.4 ohm
resistors in series add up i.e. 0.6 + 0.6 + 0.6 + 0.6 = 2.4 ohm but as glow plug are wired parallel = 0.15 ohm Last edited by dorsetsmith on 24th Jan 2017 2:10pm. Edited 3 times in total |
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24th Jan 2017 7:58am |
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| B4Lamb Member Since: 21 Mar 2015 Location: Abergavenny, Wales Posts: 233
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Just measured my Glow Plugs with an Ohm meter. Its hard to separate 1 glow plug from the others as they are wired on a stiff rail so I measured all 4 in parallel. I got about 0.6 Ohms cold implying that they are 2.4 Ohms each assuming all mine are working normally so it would be good to test just one on its own. I put a current clamp around the live feed to them and at ignition on I measure a peak current of 22 Amps (13 V/0.6 Ohms is about right then) and that dropped gradually over the first 5 seconds to 14 Amps and then when the Glow plug amber warning extinguished the current dropped to 11 Amps. I cranked the engine to start it and after about a 45 secs the 11 Amps dropped to zero. This seems to support the theory of them running at a lower heat for a period of time after engine start as calculated by the ECU. Interesting.... "You are never to old to learn something new"
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24th Jan 2017 10:35am |
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| dgardel Member Since: 30 Nov 2008 Location: Veneto (Heart & Head) Posts: 3586 
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NO turbo (it isn't liquid cooled) But could be the EGR cooler, also water dripped into the EGR can produce white smoke at the engine start up..... Has the oil traces of water? (white mud?) or black oil bubble in suspension inside the engine cooling liquid? in this case should be the oil cooler EGR and oil cooler are both liquid cooled For the parallel resistences 1/(Req.) = 1/R1 + 1/R2 + 1/R3 + 1/R4 and Req. = 0,6 Ohm assuming R1 = R2 = R3 = R4 = 2,4 Ohm Discovery 5 td6 HSE Stornoway Gray Outback Engineering Limited Edition 
IID Pro MV License |
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24th Jan 2017 1:30pm |
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