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27th February 2018, 19:55 | #1 |
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Mpg dropped considerably in the past week...
Mg zt-t cdti. Was averaging 47 mpg now I can barely get it to go over 35 mpg? Usually get about 230 miles for £30. This week I’ve got about 150 miles tops. Any ideas/commen problems?
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27th February 2018, 19:55 | #2 |
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Cold weather can cause a big drop
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27th February 2018, 20:00 | #3 |
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Which is where a FBH really pays for itself, in getting the engine up to temperature rapidly.
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27th February 2018, 21:51 | #4 |
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Check your egr system ans intercooler orings... you could be loosing boost pressure...
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27th February 2018, 21:57 | #5 |
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Check your running temps, maybe the thermostat is stuck open a bit?
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28th February 2018, 10:02 | #6 |
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Agree on the running temperature. A sudden change like this is likely caused by the cold weather being too much for the system to cope with. The diesel stats are often on a knife edge of performance and a big drop in ambient temperature is too much to handle. Think about the in-line stat modification. Or if you have that, a replacement unit, preferably an 89C version made by the recommended companies (FirstLine, Wahler, Gates). These are known to be watertight when shut, a common cause of stat under-performance in diesels.
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28th February 2018, 12:02 | #7 |
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Ambient temperature seems to have a big effect on diesels.
During the summer I get 300 miles to the half tank point, but in this very cold weather I am lucky to get 250 - same journeys and driving style. And this is with a FBH...... |
28th February 2018, 12:35 | #8 |
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I’ve done my O rings for updated ones and I’ve done the in line stat mod! I have changed my abiant temp sensor last week though because it was reading 22 Degress and now it’s reading normal which is COLD! Il do live data on the coolant temp and report back! Also my egr and manifold is clean
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3rd March 2018, 21:05 | #9 |
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I get around 46-48 mpg in the summer just doing reasonably short and middle distances. 50-52 on m/way journeys. Winter time, I have just got 37 mpg doing short journeys. I.E. 1to 3 miles at a time. Fbh works very well but of course burns diesel when working. Lately it has been running all the time on short journeys because of the ambient of around -2 to -7. So lower mpg in winter is normal for other reasons also, like fuel ‘shrinkage ‘.
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4th March 2018, 09:53 | #10 |
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