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#51
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#52
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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 ??? |
#53
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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.
__________________
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim 2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim |
#54
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#55
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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... |
#56
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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 |
#57
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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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#59
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__________________
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim 2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim |
#60
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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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