Hello
I experience a very high fuel consumption for no apparent reason. The car is a 2016 year model Doblo with 1.6 multijet2 105. The car has ca 65000km on the clock. Everything seems to work fine otherwise. I noted the consumption on the screen and in reality (confirmed by full to full against the odo measurement) to be whooping 7,0l/100km or lousy 40mpg in other words. Keep in mind I drive 25km to work, not a single traffic light, just steady 100-110km/h or 60-65mph drive. For reference, my other car a Volvo V70 with a very similar 109hp 1.6diesel takes 5,0l/100km (56,5mpg) at the same task (it probably has better aerodynamics, but is for sure a good bit heavier and uses wider tires).
What I have done so far to no avail :
0. Upon the purchase I scanned with MaxiECU and checked the fluid levels - no issues.
1. Temporarily unplugged the EGR (no change)
2. Cleaned the air flow sensor (removed and sprayed with dedicated cleaner, was not so dirty in fact)
3. Cleaned the air pressure sensor on the back of the motor (removed and sprayed with dedicated cleaner, was not so dirty in fact)
4. Cleaned the EGR (removed and sprayed with dedicated cleaner, was not so dirty in fact, moved freely)
5. Checked and blown with pressurized air the air filter (did not look dirty at all).
6. Checked the main running parameters (without really knowing what to look for or how to interpret it), few rose my doubts:
6a. It states that the ECU was replaced at 63kkm, should I be concerned? Should I check that with Fiat dealer? Can it be programmed wrongly somehow? I don't think I can count on honest info from PO, not sure if I even have his number.
6b. The measured vs target airflow is lower by a good margin. See below. Is that normal? What could be the cause?
6c. The battery voltage is ca 14v at idle and 2krpm , but when driving it is rather low, see below. Is that normal? Should I be concerned? What should I additionally check in such case?
Future steps:
The regular maintenance was done (according to the paperwork that followed with the car) at 55kkm, so I should still be good, but just to take taht out of equation:
a. change air filter
b. change fuel filter cartridge
c. change oil+filter
Any pointers? Any important parameters and their values I should look for and present here?
These are some parameters at a stable cruise:
I experience a very high fuel consumption for no apparent reason. The car is a 2016 year model Doblo with 1.6 multijet2 105. The car has ca 65000km on the clock. Everything seems to work fine otherwise. I noted the consumption on the screen and in reality (confirmed by full to full against the odo measurement) to be whooping 7,0l/100km or lousy 40mpg in other words. Keep in mind I drive 25km to work, not a single traffic light, just steady 100-110km/h or 60-65mph drive. For reference, my other car a Volvo V70 with a very similar 109hp 1.6diesel takes 5,0l/100km (56,5mpg) at the same task (it probably has better aerodynamics, but is for sure a good bit heavier and uses wider tires).
What I have done so far to no avail :
0. Upon the purchase I scanned with MaxiECU and checked the fluid levels - no issues.
1. Temporarily unplugged the EGR (no change)
2. Cleaned the air flow sensor (removed and sprayed with dedicated cleaner, was not so dirty in fact)
3. Cleaned the air pressure sensor on the back of the motor (removed and sprayed with dedicated cleaner, was not so dirty in fact)
4. Cleaned the EGR (removed and sprayed with dedicated cleaner, was not so dirty in fact, moved freely)
5. Checked and blown with pressurized air the air filter (did not look dirty at all).
6. Checked the main running parameters (without really knowing what to look for or how to interpret it), few rose my doubts:
6a. It states that the ECU was replaced at 63kkm, should I be concerned? Should I check that with Fiat dealer? Can it be programmed wrongly somehow? I don't think I can count on honest info from PO, not sure if I even have his number.
6b. The measured vs target airflow is lower by a good margin. See below. Is that normal? What could be the cause?
6c. The battery voltage is ca 14v at idle and 2krpm , but when driving it is rather low, see below. Is that normal? Should I be concerned? What should I additionally check in such case?
Future steps:
The regular maintenance was done (according to the paperwork that followed with the car) at 55kkm, so I should still be good, but just to take taht out of equation:
a. change air filter
b. change fuel filter cartridge
c. change oil+filter
Any pointers? Any important parameters and their values I should look for and present here?
These are some parameters at a stable cruise:
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