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  #51  
Old 02-17-2015, 10:41 AM
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Quote:
Originally Posted by London Lad View Post
Thanks but I suspect the drop is too quick for that as it happens in seconds and I would have thought it would have taken longer for intake air to effect the water jacket especially in relatively mild weather. But who knows.

I'm going to change the ecg stat today as its a cheap and easy job and see if that helps
Yeah, those are too quick changes in the temp to be real. 75 to 85 in 10 secs while cruising on the motorway is unlikely to happen even in a hot summer day.
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  #52  
Old 02-17-2015, 11:07 AM
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OK changed the EGR stat and it makes no difference.

I did a quick test; sitting stationary with a full heat soaked engine, RPM at idle, temp 84c. Increase RPM to 4000 and temp drops to 71c in 6 seconds. Drop RPM back to idle and temp returns to 84 in 20 seconds. ??

Same test but increasing RPM to 2200 shows no drop ???
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  #53  
Old 02-17-2015, 12:48 PM
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Originally Posted by TriX5 View Post
Curious, how do you know the DEF was frozen?

I park indoor (garage is part of the house) so I haven't experienced that yet.
The check engine light came on. I used BMWhat and read the DTC which was "Reductant pressure control, plausibility Code: 4952".

I assume because it was frozen, it could not supply the proper pressure. After about 30 minutes of driving, I reset it and it didn't come on again over the next three hours or so I was driving. That combined with the fact that it was well below the -11C freeze point of the DEF solution and that the X5 was sitting in -10.5C to -18C temperatures for over 15 hours. I suppose I can't know for sure.
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  #54  
Old 02-18-2015, 05:59 PM
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Quote:
Originally Posted by London Lad View Post
OK changed the EGR stat and it makes no difference.

I did a quick test; sitting stationary with a full heat soaked engine, RPM at idle, temp 84c. Increase RPM to 4000 and temp drops to 71c in 6 seconds. Drop RPM back to idle and temp returns to 84 in 20 seconds. ??

Same test but increasing RPM to 2200 shows no drop ???
ERG thermostat? I think this thread is about COOLANT thermostat and how low it gets stuck in open position and results in lower engine coolant temperature and thus worse gas mileage.
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  #55  
Old 02-18-2015, 06:21 PM
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Originally Posted by seattle View Post
ERG thermostat? I think this thread is about COOLANT thermostat and how low it gets stuck in open position and results in lower engine coolant temperature and thus worse gas mileage.
Non US cars have 2 coolant thermostat: the main one and then one on the coolant line that runs through the EGR cooler. That one too fails.

To London Lad: the first thing I would confirm is that your particular engine doe not have a map controlled thermostat. I don't think any diesel engine does, but I would double check. The easiest way is probably too loop up RealOEM with your VIN and see if the thermostat has any wiring going to it. That is unless you can see the thermostat casing. Map controlled thermostat have an electrical heating element controlled by the ECU that opens the thermostat under certain conditions. It is very common in gasoline cars where the engine normally runs at higher temperature while cursing (to increase fuel economy) while cooler under acceleration.

If you have a regular thermostat than it a puzzling behavior: perhaps the thermostat has weaken to the point that the increased flow from the faster spinning water pump opens it? It is not a normal behavior and the temperature of the air coming into the intake has no effect...
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  #56  
Old 02-19-2015, 06:12 AM
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To ZetaTre

Thanks for that. I had been starting to think that a weak stat spring giving way under pump pressure was the only explanation. Its not MAP controlled. I have experienced them failing (the heater part) in new Minis before
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  #57  
Old 02-19-2015, 10:39 AM
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But how in the world this engine will loose 13C in 6 seconds and heat-up 13C in 20 seconds on idle? Are you sure you are looking at the coolant sensor data and not the radiator outlet temp?
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  #58  
Old 02-19-2015, 11:27 AM
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Originally Posted by bawareca View Post
But how in the world this engine will loose 13C in 6 seconds and heat-up 13C in 20 seconds on idle? Are you sure you are looking at the coolant sensor data and not the radiator outlet temp?
I'm using THIS which only has one water temp gauge ?
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  #59  
Old 02-19-2015, 12:34 PM
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But how in the world this engine will loose 13C in 6 seconds and heat-up 13C in 20 seconds on idle? Are you sure you are looking at the coolant sensor data and not the radiator outlet temp?
Almost looks like intake temperature or something.


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I'm using THIS which only has one water temp gauge ?
I have two of these. Unfortunately it's not with me right now so I can't see how it works on the X5. Works good on my Tahoe and M5.
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  #60  
Old 02-19-2015, 12:50 PM
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I'd like to report back after replacing the themostat. Now the temp is around 89-90 degree most of time.
Thanks to ZetaTre and rest of people helped.
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