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Math43
Member Since: 23 Dec 2020
Location: LYON
Posts: 21
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Hello,
I've got a little question about my fuel consumption on my LR3 V8, my engine is remapped to run with E85 fuel and my max autonomy is 250km (28 liters for 100km) with full tank with short ride, it goes to 350km (22 liters for 100km) with a full tank on highway. It's seems a lot to me...
Spark plugs are new, throttle body has been cleanned and every 250/300km i've got the engine light with code p0420 - Catalyst system efficiency below threshold (Bank 1)
I would like to check the good condition of my O2 sensor, is this possible with the IIDTOOL? if so what should I look for and have as value?
Is there something else I can check ?
Thanks a lot !
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 1st Feb 2022 8:16 pm |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6778
  
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RE85 consumption should generally be around 25-35% more than for 95E10.
What happens if you use 95E10 instead? Can you use that? I’m assuming the “remap” is really a box that controls the engine AND is between the original ECU and the engine intercepting fuel injection commands. I’m also assuming that there is a sensor in the fuel line that determines the ethanol content in the fuel as that is relevant to how much fuel to inject.
22 / 1.3 = 17 which is a bit on the high side but “achievable”
How do you determine the range? Do you rely on the trip computer or do you rely on manual calculations and filling of the tank until the brim? The former should not be trusted 
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| 1st Feb 2022 9:38 pm |
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Yankee_Rover
Member Since: 02 Jun 2021
Location: Seattle
Posts: 183
  
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On 92 octane I can get 20-22 miles per gallon (around 12L/100km by my math?) open highway going 65-70 mph. In the mountains it drops to 17-18mpg, still highway. I agree 22L/100km is 30-40% lower than what might be expected of E85.
I’ve found the trip economy estimator to be quite accurate if it’s been reset for the trip or left alone for long term and your driving style doesn’t change.
So far as things to check. You should also check your MAF sensor and clean it with the appropriate solution. I use CRC MAF cleaner and it gets high marks.
For checking O2 sensors, you have 4, one on either side of each catalytic convertor. You can pull up the live values and compare them to one another. If one is bad the readings will be way out of whack.
Edited: correcting an error 2008 LR3 HSE, 4.4L V8
Last edited by Yankee_Rover on 2nd Feb 2022 1:48 pm. Edited 1 time in total
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| 2nd Feb 2022 12:39 am |
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Math43
Member Since: 23 Dec 2020
Location: LYON
Posts: 21
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kajtzu wrote:RE85 consumption should generally be around 25-35% more than for 95E10.
What happens if you use 95E10 instead? Can you use that? I’m assuming the “remap” is really a box that controls the engine AND is between the original ECU and the engine intercepting fuel injection commands. I’m also assuming that there is a sensor in the fuel line that determines the ethanol content in the fuel as that is relevant to how much fuel to inject.
22 / 1.3 = 17 which is a bit on the high side but “achievable”
How do you determine the range? Do you rely on the trip computer or do you rely on manual calculations and filling of the tank until the brim? The former should not be trusted
Hi, If I use 95E10, max range I can do is 19L/100km on highway.
I determine the range with manual calculations when filling the tank, I do not trust the trip computuer.
[quote="kajtzu wrote:On 92 octane I can get 20-22 miles per gallon (around 12L/100km by my math?) open highway going 65-70 mph. In the mountains it drops to 17-18mpg, still highway. I agree 22L/100km is 30-40% lower than what might be expected of E85.
I’ve found the trip economy estimator to be quite accurate if it’s been reset for the trip or left alone for long term and your driving style doesn’t change.
So far as things to check. You should also check your MAF sensor and clean it with the appropriate solution. I use CRC MAF cleaner and it gets high marks.
For checking O2 sensors, you have two, one on either side of the catalytic convertor. You can pull up the live values and compare them to one another. If one is bad the readings will be way out of whack.
I will look MAF sensor and O2 sensors with IIDtool.
Thanks you both of you for your help 
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| 2nd Feb 2022 7:30 am |
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Yankee_Rover
Member Since: 02 Jun 2021
Location: Seattle
Posts: 183
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Need to make a small correction, there are 4 O2 sensors, not 2. There is one in front of and behind each catalytic convertor, and since the V8 has a dual exhaust with two cats, there are 2 sets for a total of 4. When looking at live data this should make it easier for you to tell which sensor is amiss, if any. 2008 LR3 HSE, 4.4L V8
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| 2nd Feb 2022 1:47 pm |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6778
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The 19 l/100 km for highway sounds a bit much… I mean driving 80-120 km/h I would think it should be closer to 14-ish. 19-20 l/100 km is driving downtown 10-30 km/h, braking and accelerating constantly.
Besides the O2 sensors, which sounds like a good idea to check, have you thought whether you have something else? Maybe a slight burnt smell or heat from one of the wheels? Stuck brake caliper or brake shoes?
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| 2nd Feb 2022 4:52 pm |
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