 | Home > Puma (Tdci) > Will an OBD reader diagnose faulty/failed glowplugs? |
 
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| neon1991 Member Since: 26 Mar 2018 Location: Colchester Posts: 75   
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I've got the britpart lynx evo and it does. glow plugs are fairly easy to test once you have them out of the car. there's a fuse for them which is worth checking and the wiring loom for the glow plugs has been know to become lose (which then causes the fuse to blow)
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19th Feb 2024 2:29pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6605 
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On a 2.4 you can't diagnose an individual plug, only that the supply out from the relay to the glow plugs is working.
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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19th Feb 2024 2:35pm |
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| bodstruck Member Since: 09 May 2020 Location: Wiltshire Posts: 908
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Your symptoms are the same as I had last year. Changed the glow plugs and the difference was huge - easy start and no smoke.
A set of Bosch glow plugs are not expensive and the change is not a terrible job. I cleaned the inlet manifold and changed he seals at he same time. I would suggest cracking on and changing them. |
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19th Feb 2024 2:38pm |
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| pistonfields Member Since: 29 Mar 2022 Location: Zurich Posts: 72 
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You can use a clamp meter to measure current on the wire going to the glow plugs to see if they work at all. If the connection BETWEEN the glow plugs is accessible then measure between each glow plug around the metal strip that connects them. You should get more or less even distribution of amperage between the glow plugs (that should add up to the value measured on the wire feeding them). If value doesn't change before and after one plug it is not working.
More often than not on car engines getting to the plugs is the problematic part. Honestly, haven't checked where they are yet on my Puma  |
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19th Feb 2024 2:39pm |
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| Ads90 Member Since: 16 Jun 2008 Location: Cots-on-the-Wolds Posts: 809 
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Thanks all, I just watched a LR Time vid on testing the plugs on a Disco - I don't have a clamp meter, but might just go ahead and get them all changed as suggested - they are still the original on my 2007.
I'll also check the wiring and fuse - thanks! |
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19th Feb 2024 3:26pm |
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| Scotm Member Since: 28 Feb 2014 Location: Aberdeenshire Posts: 666  
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Just had my glow plugs changed on my 2.2 due to starting problems.
For some reason nothing showed up on my permanently fitted Ultra Gauge but as soon as I plugged in a cheapy bluetooth one it flagged up problems with 3 of the plugs. |
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19th Feb 2024 4:57pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2414  
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I see very often people have to renew these plugs. What mileage? Puma 110" SW
............................................................. Earth first. Other planets later |
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19th Feb 2024 10:59pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17363 
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When they fail and the engine becomes difficult to start.
It is impossible to give a typical mileage since it entirely depends on the use of the vehicle, the environment and climate, and how much the heater plugs have had to do in their service lives (they work harder in the cold than the warm, of course). My Defender lives in the south of England, is used a lot in all seasons, and has all original plugs at 275k miles. I have a new set on the shelf, just in case though. |
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20th Feb 2024 9:07am |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2414
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 Puma 110" SW
............................................................. Earth first. Other planets later |
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20th Feb 2024 10:06am |
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| Scotm Member Since: 28 Feb 2014 Location: Aberdeenshire Posts: 666
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Mine were just changed at 12 years 122k after spending most of its life in NE Scotland.
I wonder if the 2.2 might go through them more as they sometime operate to support the DPF regeneration? |
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20th Feb 2024 1:42pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17363
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Do they? Why? Seems odd....
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20th Feb 2024 3:16pm |
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| Scotm Member Since: 28 Feb 2014 Location: Aberdeenshire Posts: 666
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When challenged by Blackwolf, I was doubting myself for a minute (!) where I had read it but here it is out of the workshop manual:
Active Regeneration Active regeneration starts when the particulate loading of the DPF reaches a threshold as monitored or determined by the DPF control software. The threshold calculation is based on driving style, distance travelled and back pressure signals from the differential pressure sensor. Active regeneration generally occurs every 250 miles (400 km) although this is dependant on how the vehicle is driven. For example, if the vehicle is driven at low loads in urban traffic regularly, active regeneration will occur more often. This is due to the rapid build-up of particulates in the DPF than if the vehicle is driven at high speeds when passive regeneration will have occurred. The DPF software incorporates a mileage trigger which is used as back-up for active regeneration. If active regeneration has not been initiated by a back pressure signal from the differential pressure sensor, regeneration is requested based on distance travelled. Active regeneration of the DPF is commenced when the temperature of the DPF is increased to the combustion temperature of the particles. The DPF temperature is raised by increasing the exhaust gas temperature. This is achieved by introducing post-injection of fuel after the pilot and main fuel injections have occurred. This is determined by the DPF software monitoring the signals from the two DPF temperature sensors to establish the temperature of the DPF. Depending on the DPF temperature, the DPF software requests the ECM (engine control module) to perform either one or two post-injections of fuel: The first post-injection of fuel retards combustion inside the cylinder which increases the temperature of the exhaust gas. The second post-injection of fuel is injected late in the power stroke cycle. The fuel partly combusts in the cylinder, but some unburnt fuel also passes into the exhaust where it creates an exothermic event within the catalytic converter, further increasing the temperature of the DPF. The active regeneration process takes up to 20 minutes to complete. The first phase increases the DPF temperature to 500°C (932°F). The second phase further increases the DPF temperature to 600°C (1112°F) which is the optimum temperature for particle combustion. This temperature is then maintained for 15-20 minutes to ensure complete incineration of the particles within the DPF. The incineration process converts the carbon particles to carbon dioxide and water. The active regeneration temperature of the DPF is closely monitored by the DPF software to maintain a target temperature of 600°C (1112°F) at the DPF inlet. The temperature control ensures that the temperatures do not exceed the operational limits of the turbocharger and the catalytic converter. The turbocharger inlet temperature must not exceed 830°C (1526°F) and the catalytic converter brick temperature must not exceed 800°C (1472°F) and the exit temperature must remain below 750°C (1382°F). During the active regeneration process the following ECM controlled events occur: The turbocharger is maintained in the fully open position. This minimizes heat transmission from the exhaust gas to the turbocharger and reduces the rate of exhaust gas flow allowing optimum heating of the DPF. If the driver demands an increase in engine torque, the turbocharger will respond by closing the vanes as necessary. The throttle is closed as this assists in increasing the exhaust gas temperature and reduces the rate of exhaust gas flow which has the effect of reducing the time for the DPF to reach the optimum temperature. The EGR (exhaust gas recirculation) valve is closed. The use of EGR decreases the exhaust gas temperature and therefore prevents the optimum DPF temperature being achieved. The glow plugs are occasionally activated for up to 40 seconds to provide additional heat to assist in raising the DPF temperature. If, due to vehicle usage and/or driving style, the active regeneration process cannot take place or is unable to regenerate the DPF, the dealer can force regenerate the DPF. This is achieved by either driving the vehicle until the engine is at its normal operating temperature and then driving for a further 20 minutes at speeds of not less than 30 mph (48 km/h) or by connecting an approved Land Rover diagnostic system to the vehicle which will perform an automated static regeneration procedure to clean the DPF. |
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20th Feb 2024 5:48pm |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 1997
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Scotm beat me to it
I was just writing. - I need to check the manual regarding if/ how this is implemented on the 2.2 however the articles from Denso and NGK explain the principles , noting the 2.2 glow plugs are Bosch. Denso. https://www.denso-am.eu/news/deneur19_28_g...missions-1 NGK https://www.ngkntk.com/newsroom/blog/emea/...ce-is-key/ This is the irony of DPF’s . Many owners of Vehicles with DPF’s , including me, ensure we go for a regular half hour blast along a dual carriageway or motorway just to ensure the DPF has a good regeneration once a month, even if it is a total pointless journey. How’s that for reducing emissions  |
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20th Feb 2024 5:49pm |
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