02-14-2024, 08:22 PM | #1 |
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2012 BMW x5 diesel with low mileage x gallon
I am getting 14 mpg in my BMW x5 diesel, it is a 2012 with 85.000 miles
I have a code of glow plug and we are in winter What do you thing is the problem have the car? Is the glow plug the cause to get 14mpg? Is the winter ? Should be another problem? |
02-14-2024, 10:07 PM | #2 |
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Yes. Diesels run pretty cold compared to a gasoline engine. The glow plugs help warm the engine up until it reaches operating temp. Before it reaches operating temp diesel doesn't combust as efficiently as it should.
What's common on these engines is the thermostat(s) will fail open and cause the glow plugs to continuously be on trying to get the engine up to operating temp and eventually burn out. Depending on your codes, and how long this has been an issue you might need to replace your thermostats, glow plugs, and glow plugs controller. What are the codes? Not P codes, mind you. Actual BMW hex codes. |
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02-15-2024, 04:14 AM | #3 | |
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02-15-2024, 05:53 PM | #4 |
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02-19-2024, 12:16 PM | #5 |
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I wouldn’t make any assumptions on the thermostat being the cause of bad mpg until you know for sure your turbo vacuum system is 100%. Bad glow plugs are much easier to diagnose without a dpf and scr filter . Bad thermostat is very common though. If you have a scan tool it would be good to check to make sure your coolant temp gets up to atleast 180F. I think there’s also a way to get coolant temp on the gauge cluster when you first start the x5. I have a banks gauge in my x5
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02-19-2024, 03:37 PM | #6 |
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02-19-2024, 03:45 PM | #7 | |
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Haven’t seen him active here for awhile though. He was supposed to be working on an intake for me too . I wish he would send me the files for his designs I bet I could make them on my 3d printer if he’s too busy
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02-19-2024, 03:47 PM | #8 | |
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02-20-2024, 03:42 PM | #9 | |
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02-20-2024, 07:22 PM | #10 |
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02-22-2024, 02:49 PM | #11 |
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I will Change glow plug and thermostats tomorrow
Mechanic said that is heather air is working well don’t thing be thermostats problem I will let you know Thanks |
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02-23-2024, 07:14 AM | #13 | |
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This is the side crash test showing the pillar being deployed: https://youtu.be/nX_NV_FfdNk?si=h9kbSSyKb94cmLRi
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02-23-2024, 07:05 PM | #14 | |
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02-25-2024, 07:59 AM | #15 |
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Tell your mechanic to change it anyway, even if only as a preventative measure. It will eventually need to be replaced.
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02-29-2024, 10:57 AM | #16 |
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Back on topic, I drive harder than most and I've never gotten under 20 MPG in my x5 35d. You've definitely got a problem... Are you down on power? I wonder if you have a turbo or boost leak issue making the vehicle less efficient?
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