02-01-2021, 12:47 PM | #1 |
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2011 X5 35d Low MPG Issue
Hi guys,
I recently purchased a 2011 x5 35d and noticed that my average mpg has been kind of low. I've been averaging 21 mpg (according to the BC) with about 50/50 city/highway driving. I'm struggling to obtain 400 miles out of a tank. I recently replaced the thermostat as that failed open, however, it didn't do a whole lot to my mpg. The thermostat now works properly and gets up to temp. I'm not sure if it's a clogged DPF, I've been monitoring my DPF with bimmer-tool and it appears that there's not that much ash/soot. I also checked my manifold for CBU, while there was a little cbu, it's nothing crazy. and I'm starting to think it might be related to my heavy 20" Style 168 wheel setup. Any other ideas on what this could be potentially related to or does this seem normal to you guys? |
02-01-2021, 01:11 PM | #2 | |
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Quote:
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2011 335d tuned by B.R.R.
2011 X5 35d tuned by B.R.R. |
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02-01-2021, 01:21 PM | #3 | |
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Quote:
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2012 X5d | Deleted & BRR Tuned | DWR TCU Tune | 10.25" Android 8.1 Screen
Build Thread https://www.xbimmers.com/forums/show....php?t=1529213 |
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02-02-2021, 10:06 AM | #4 |
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Like others have said. Thermostat would be first to check/replace and than vac lines
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02-02-2021, 04:39 PM | #5 |
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Hmm, I have replaced the thermostat and it gets up to operating temperature now. I guess I'd have to go over the vacuum lines, they don't look anywhere near the shape of the ones in the video. Is there a way to detect a vacuum leak electronically or only using a smoke machine?
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