Author Topic: X20xev fuel consumption  (Read 13912 times)

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Offline fakhri

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X20xev fuel consumption
« on: October 01, 2013, 14:50:09 PM »
hi guys, need some help in here.. my calibra is consuming fuel like crazy.. well i know in normal case 20 litter (about 5uk gallon) will make the cali travel about 180 KM (111 mile), why for my testing, maybe little less.. anyway it is going only about 100 KM (62 mile) in that same amount now.. checked everything. for leaking to sensors and there is nothing at all and no fault codes.. the car performance is cool and great ( automatic gear by the way)

any ideas?
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Offline fakhri

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Re: X20xev fuel consumption
« Reply #1 on: October 01, 2013, 18:46:22 PM »
12 people read it and no ideas?  ??? guys common there is something wrong in here and i need your help?
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Offline Gruntfuggly

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Re: X20xev fuel consumption
« Reply #2 on: October 01, 2013, 19:11:00 PM »
That sounds like pretty poor mpg even before you had the problem - 111 miles for 5 gallons is just over 20mpg - I was getting 37 out of mine before I sold it.

Surely it must be leaking somewhere? The thing is it will evaporate too, so it might not be that easy to find it. Can you smell petrol from anywhere? Might be worth taking it to a garage and get them to check it for you...

Offline fakhri

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Re: X20xev fuel consumption
« Reply #3 on: October 01, 2013, 19:33:08 PM »
ya well there was a leak in one of the hoses in the rear after the filter.. i fixed it. i did take it to a garage, checked everything from the tank till the injections.. nothing.. no gas smell at all..

I did a tech1 test and nothing showed up!! that's why i am so pissed off.. no one know why it is doing this, some till me cos of the short distance i travel, but that is non sense to me.. i know it did more than that and i am still doing the same travels !!

Coolant sensor? will it do such thing? maybe the garage didn't check it, but will it do that damage ??
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Offline est84

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X20xev fuel consumption
« Reply #4 on: October 01, 2013, 23:42:59 PM »
How far are your short journeys? You car maybe constantly running in closed loop... i.e always running rich as its not fully warmed up and running at optimal temp for a optimum amount of time.
Any black soot or black smoke coming from the exhaust ever?
Could be a faulty FPR, take the vacume nipple of it then let it idle for a few minutes and check for fuel or fuel smell from it.
Any mayo under the oil cap could indicate that the engine is not getting up to temp on your short trips..(as well as other things).
Smell your oil does it smell like fuel?
Also could be a 02 sensor starting to go bad if its running rich,
Dean :)

Offline est84

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X20xev fuel consumption
« Reply #5 on: October 01, 2013, 23:50:24 PM »
Also coolant sensor could play a part if it is bad, as it could mean that the ecu thinks its never up to temp and will compensate for that.. Dumping more fuel in, the data logger you used should tell you the coolant temp what the ecu is reading from, plug it back in and do your normal drive and you will see if thats your problem..
Dean

Offline fakhri

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Re: X20xev fuel consumption
« Reply #6 on: October 02, 2013, 07:03:42 AM »
Dean, short but do get warm, lets say every trip i make takes about 20 to 30 min minimum. no black smoke, FPR? you mean the fuel regulator on top of the injectors? the roundy thing that comes out of it a vacuum line to the TB? no white mayo in the oil nor the cap, oil is clean, but i do loose a kilo each month from leaking under the car "the crank barring" O2 sensor is ok. tested last week.

i will check this FPR thing you told me about. and the coolant as well.. it is a start :)
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Offline fakhri

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Re: X20xev fuel consumption
« Reply #7 on: October 02, 2013, 07:41:50 AM »
hi, No gas from the FPR and no smell at all... i guess i will take the car to another garage that have Tech1 and test it again! this is the only option i am left with.. but i tell him to check what exactly? "cos most of them in here are stupid"  O2, coolant temp sensor, Idle Valve .. anything else?
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Offline fakhri

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Re: X20xev fuel consumption
« Reply #8 on: October 07, 2013, 12:26:31 PM »
hi guys, just got back from the Garage, the guy told me that the thermostat is blocked open, the car's fan is always spinning keeping the car cold. is that a reason too?

I never thought it will affect that much consumption in fuel! he asked if the temp drop low when i am on a high way "which is true"

any advises here beside changing the thermostat?
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Offline tranceaddict78

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Re: X20xev fuel consumption
« Reply #9 on: October 07, 2013, 13:19:16 PM »
Also coolant sensor could play a part if it is bad, as it could mean that the ecu thinks its never up to temp and will compensate for that.. Dumping more fuel in, the data logger you used should tell you the coolant temp what the ecu is reading from, plug it back in and do your normal drive and you will see if thats your problem..
Dean
would this cause fumes in car when drivin?? Smells gettin real bad in mine,between that and burning f*cking oil i gettin real pissed off with it all. >:(   :'(

Offline ALZ1307

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Re: X20xev fuel consumption
« Reply #10 on: October 07, 2013, 13:55:14 PM »
I would say it's the Lambda sensor causing excess fuel useage myself and or CTS. Running the fan all the time wouldn't use more fuel, plenty of people do it when they can't be arsed with changing the stat.


Trance, start another thread dude :)
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Offline .rip

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Re: X20xev fuel consumption
« Reply #11 on: October 07, 2013, 14:13:36 PM »
How far are your short journeys? You car maybe constantly running in closed loop... i.e always running rich as its not fully warmed up and running at optimal temp for a optimum amount of time.

You mean open loop  ;)

Closed loop is when it adjusts fueling by reacting to the lambda value returned by the sensor. Most lambda sensors (narrowband ones, such as those fitted to Calibras) only return values for' leaner than stoichiometric' or 'richer than stoichiometric' so they constantly switch between rich & lean, but so fast that they can get away with it.
Stoichiometric is when all the fuel is burned by all the air with none of each left over. They can only do this at normal operating temperature.
When running from cold, they need to run rich. The lambda sensor cannot detect how rich an engine is running, just that it is running rich. The ECU therefore ignores it, hence open loop.

Have you removed your plugs to check the colour of the electrodes? They should be a crusty brown colour. If they look glazed then your engine is running lean. If they look sooty then your engine is running rich. If they look oily then you have problems.

Offline fakhri

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Re: X20xev fuel consumption
« Reply #12 on: October 07, 2013, 14:56:03 PM »
I would say it's the Lambda sensor causing excess fuel useage myself and or CTS. Running the fan all the time wouldn't use more fuel, plenty of people do it when they can't be arsed with changing the stat.

its not about keeping the fan running, it is about that the coolant is getting always cold from that open thermostat, the temp do drop below 80 and still the fan keep running. no?

The Lam. Sensor is ok, it was double checked! ideal as well, Coolant temp is ok. that is what making me crazy, noting is popping on the Tech1 but still the fuel is getting away so fast!
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Offline fakhri

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Re: X20xev fuel consumption
« Reply #13 on: October 07, 2013, 15:00:22 PM »
You mean open loop  ;)

Closed loop is when it adjusts fueling by reacting to the lambda value returned by the sensor. Most lambda sensors (narrowband ones, such as those fitted to Calibras) only return values for' leaner than stoichiometric' or 'richer than stoichiometric' so they constantly switch between rich & lean, but so fast that they can get away with it.
Stoichiometric is when all the fuel is burned by all the air with none of each left over. They can only do this at normal operating temperature.
When running from cold, they need to run rich. The lambda sensor cannot detect how rich an engine is running, just that it is running rich. The ECU therefore ignores it, hence open loop.

Have you removed your plugs to check the colour of the electrodes? They should be a crusty brown colour. If they look glazed then your engine is running lean. If they look sooty then your engine is running rich. If they look oily then you have problems.
yes, and open loop. the thermo never closes i assume from what he said. so? keeps the car cold, the coolant temp reads a low temp, gives an order to the ECU, then more fuel are injected for no reason..

i will check the sparks now, give me 10 min
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Offline fakhri

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Re: X20xev fuel consumption
« Reply #14 on: October 07, 2013, 15:22:57 PM »
ok go here .. http://fakhrihusseini.webstarts.com/my_calibra.html  scroll till the very end.. you will see the pic.. they are brown!
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