12-20-2018, 09:21 AM | #1 |
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435d takes ages to get to operating temp
Anyone got any bright ideas on how to get the engine to operating temp quicker. Car was great in the summer and gave decent mileage. Now the cold weather has set in, i can pretty much get most of the way to work on my 28mile commute and the engine just about reaches temp- and then the mpg suffers drastically.
Is there anything i can do to increase the speed it reaches optimum temp? will driving it in eco, comfort or sport make any difference? heating controls and heated seats on or off? |
12-20-2018, 09:26 AM | #3 | |
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12-20-2018, 09:54 AM | #6 |
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12-20-2018, 10:03 AM | #7 |
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Yep, replace thermostat. Faulty thermostats lead to DPF getting blocked, as they never get hot enough to regenerate.
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12-20-2018, 10:18 AM | #10 |
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Even on a warm day in summer my 335d would struggle to be up to normal operating temperature in 5 miles and on colder winter days it takes rather longer than that! It's always been the same since new and hence I've just assumed it was normal; the car's had 3 services at the main dealer and presumably their diagnostics would have detected any fault with the thermostat?
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12-20-2018, 10:34 AM | #11 | |
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The 5 miles and it is getting hot, either have to work the engine hard (and I mean 'hard'), and consumption will be horrendous, or there just isn't enough waste heat available. OP's case is different, typical signs of thermostat issues. |
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12-20-2018, 10:37 AM | #12 |
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The diesel's are still in the stone age with a simple mechanical thermostat. Has to be a big allowance for variables with the setup.
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12-20-2018, 03:09 PM | #13 | |
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My 3 litre diesel can get up to temp in around 4 or 5 miles during summer (when it's 20c+) but this time of year with the heater blowing the warm air into the cabin it takes more like 8-10 miles for the oil temp needle to reach the middle. Sounds like there's a thermostat issue on the OP's car. Last edited by Hooded; 12-20-2018 at 03:39 PM.. |
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12-20-2018, 03:30 PM | #15 |
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Mine's the same, did 10 miles to the local Costco, with about 3 miles at 70 on the bypass and it still hadn't reached the middle, if you just pootle about it hardly moves. Thought that was just a characteristic of the car. Doesn't seem to affect how the car drives.
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12-20-2018, 03:46 PM | #18 |
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Stick it in comfort mode and try and get it to rev up to around 2000/2500rpm once the oil temp gets to the quarter mark (75c) .. it'll reach the middle (100c) fairly quickly then. If you are sitting with it constantly at 1100/1200rpm in this cold weather it'll take a while to reach optimum operating temp.
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12-21-2018, 12:04 AM | #19 |
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Temp gauge on the cluster shows the engine oil temp ONLY - not the coolant temp!
Regardless what oil temp it reaches after a while and how much time it takes to get to the mid point on the cluster oil temp gauge, what you need is the engine Coolant temp, which can be displayed from the hidden menu i.e. holding the trip reset button on the cluster and scrolling down to 'Unlock' - add last 4 digits of your VIN, enter, and the menu is unlocked -- now scroll to 'coolant temp' and drive - you should be able to see how much time it takes to get to 80 deg + (with the heater off) - normal operating should range from 85 deg to 98 deg. If it dont get to 80+ quickly definitely there is an issue regardless of the weather - could be sticky thermostat, clogged dpf or even the egr valve. |
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12-21-2018, 03:58 AM | #22 |
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My car usually takes around 8 miles in these lower temperatures, 30-40mph roads, to reach full operating temperature on the oil temp gauge.
If you use the coolant temp display in the OBC hidden menu you can see when the thermostat opens : typically the coolant temp will increase reasonably quickly to 70-80C then either stop increasing, or may decrease, for a while when the stat opens and the coolant from the radiator starts to flow around the block. Once all coolant has reached the same temperature the reading will increase again, up to full operating temp. This seems to be 98-108C for my car, depending on how hard the engine is working.
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