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  #1  
Old 10-01-2014, 12:01 PM
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Wondering if glow plugs get triggered below 75 Celsius on M57 diesel?

Hello friends, Was reading BMW technical training material and some european diesel forums about the normal running temperature of M57 diesel engine on 2009 X5D.
In the training material,it says glow plugs works untill the temp warms up to 75 Celcius.My 2009 X5d's engine temp sometimes on highway with constant speed goes below to 73 C from 78~80 in the city stop and go traffic.I think my thermostat is bad and i am going to change it.

But few questions are arising in my mind:
1.Do glow plugs start working again if temp goes below 75 after the engine has reached temp over 75 once?
2.Will running engine below 75C effect active or passive DPF regen?
3.I showed it to the dealer and they say that if there is problem with the thermostat, then it will trigger some cooling system error code.But i read on some diesel forums that M57 should run at around 87~88C.So as my engine's temp is going below 75,why its not triggering any engine code?
Looking forward for your suggestions.thanks
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  #2  
Old 10-02-2014, 11:31 AM
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Yes trader4 i am going to change the thermostat and sure its running colder than normal running temp.Actually i got this suggestion by very knowledgeable fellow at bimmerfest.His dad's car stopped regenerating DPF because of the bad thermostat.As there is a requirement of min engine coolant temp for the DPF regen and his engine was not reaching the proper temp for regen to start and he ended up with clogged DPF.I also read that cooler running engine will damage glow plugs as they activated below 75 deg C.

So did you get any DPF regen issues when your car was running cold due to bad thermostat?
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Old 10-02-2014, 12:18 PM
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Quote:
Originally Posted by ninja_zx11 View Post
H
3.I showed it to the dealer and they say that if there is problem with the thermostat, then it will trigger some cooling system error code.
uggh.

The universal sign intellectually lazy.
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Old 10-02-2014, 12:59 PM
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yes ard i know but the question is if there are so many serious effects of cold running engine,then why bmw did not include the check in their software.Does it mean that its all running normal as there are no defects diagnosed by DDE??or i am just thinking too much or i just being paranoid?...
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Old 10-02-2014, 09:16 PM
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Quote:
Originally Posted by ninja_zx11 View Post
yes ard i know but the question is if there are so many serious effects of cold running engine,then why bmw did not include the check in their software.Does it mean that its all running normal as there are no defects diagnosed by DDE??or i am just thinking too much or i just being paranoid?...
Because it is not a heated MAP t-stat as on a petrol engine, otherwise it would be a required OBD monitor.
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Old 10-03-2014, 05:39 AM
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All BMWs after year 2000 have a sensor on the radiator outlet.The ECU knows very well when there is a problem with the t-stat.The engine temp does not have a dedicated monitor in the gasoline engines.But running cooler than required for extended period of time will trigger CEL because that leads to increased emissions.Maybe not that drastically on a diesel engine,but running at 75C should definitely trigger a CEL.
Glow plugs are actuated for a few seconds only before the engine is started at ambient temps lower than ~10C or 50F.I dont know of any situation when they will be activated with the engine running.
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Old 10-03-2014, 11:39 AM
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This is what i found in the (BMW M57 deisel engine for X5) training material.It says partial load heating can occur if the coolant temp is below 75 deg.

Another test we can do is to wire up small led to one of the glow plug and see if they are actually activated.
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Old 10-03-2014, 01:07 PM
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Interesting,I didnt know that.It says "depending on speed and load",which means the plugs are not actuated permanently.My guess is that are actuated at transient conditions,when the torque required value changes rapidly,going from no boost to boost,etc.
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Old 10-03-2014, 01:27 PM
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So this shows that it's better to change the thermostat if the temp goes below 75C while driving to prevent unnecessary triggering of the glow plugs.
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