Author Topic: X20xev fuel consumption  (Read 38417 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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Offline est84

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X20xev fuel consumption
« Reply #15 on: October 07, 2013, 15:29:00 PM »
.

Offline est84

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X20xev fuel consumption
« Reply #16 on: October 07, 2013, 15:35:45 PM »
You mean open loop ;)
That indeed i did ;)
You will know its the thermostat sticking open as it will take forever to get up to temp, but sounds like a likely cause.
How long does it take to warm up from cold? As it should only take around 5 mins for the coolant to get nice and warm..
Dean

Offline fakhri

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Re: X20xev fuel consumption
« Reply #17 on: October 07, 2013, 15:45:00 PM »
That indeed i did ;)
You will know its the thermostat sticking open as it will take forever to get up to temp, but sounds like a likely cause.
How long does it take to warm up from cold? As it should only take around 5 mins for the coolant to get nice and warm..
Dean

about 10 min tops i guess i didn't monitor it.. tomorrow i will watch it
what about the plugs ?? did you see the pics?
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Offline est84

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X20xev fuel consumption
« Reply #18 on: October 07, 2013, 15:49:21 PM »
How long have they been in there,? Normally a rich running car will be blacker than that,

Offline fakhri

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Re: X20xev fuel consumption
« Reply #19 on: October 07, 2013, 15:52:04 PM »
How long have they been in there,? Normally a rich running car will be blacker than that,
since Apr.. i guess!
not that mileage though !
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Offline est84

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X20xev fuel consumption
« Reply #20 on: October 07, 2013, 15:57:46 PM »
Yes they do look like that because of overfuleing, drain the coolant and check your thermostat, it should be closed when you take it out, stick it in a bucket of water at around 70-80 degrees and it should open up, if its open you need to replace it..
Dean

Offline tranceaddict78

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Re: X20xev fuel consumption
« Reply #21 on: October 07, 2013, 20:08:55 PM »
From what iv heard before the fuel sender unit could be rusted and fuel could be evapourating.
Im not expert,but if its rusted tru...quitrpossible. get the fuel tank outa her

Offline CraigMinter

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Re: X20xev fuel consumption
« Reply #22 on: October 07, 2013, 21:25:42 PM »
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. >:(   :'(

Your burning oil smell is caused by the cam gasket leak dropping oil onto ur manifold.

Offline fakhri

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Re: X20xev fuel consumption
« Reply #23 on: October 07, 2013, 22:54:08 PM »
From what iv heard before the fuel sender unit could be rusted and fuel could be evapourating.
Im not expert,but if its rusted tru...quitrpossible. get the fuel tank outa her


wont it cause any leaks appear  in the bottom of the tank? and smell gas as well if that is true? cos the guy did go under the tank and check everything in there.. nothing! but we didn't remove the tank and check the sender! could it be?
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Offline EddeyDancer

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Re: X20xev fuel consumption
« Reply #24 on: October 07, 2013, 23:57:56 PM »
wont it cause any leaks appear in the bottom of the tank? and smell gas as well if that is true?
cos the guy did go under the tank and check everything in there.. nothing! but we didn't remove the tank and check the sender! could it be?

You have to drop the tank, in order to check it properly...

It's not a big job to check it, but it's more so an issue in the UK, due to the weather...
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Offline CalyTurbo256

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Re: X20xev fuel consumption
« Reply #25 on: October 08, 2013, 14:51:57 PM »
wont it cause any leaks appear  in the bottom of the tank? and smell gas as well if that is true? cos the guy did go under the tank and check everything in there.. nothing! but we didn't remove the tank and check the sender! could it be?

Are you getting a loss in power as you try to accelerate, almost misfire? 

If it was your fuel sender you would have petrol leaking out under the tank, after the car has switched off.

If you are in Jordan I highly doubt you would have a rusted fuel sender unit, the only reason they rust is from the salt spread on the roads in cold winter months.  Dont think Jordan has ice or snow in winter does it?

Offline tranceaddict78

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Re: X20xev fuel consumption
« Reply #26 on: October 08, 2013, 16:01:33 PM »
I dont think vauxhall had any dealerships in jordan, therefore, import. From some sh*tty country where it rains  >:(
Im prob wrong,but anyway  ::)

Offline CalyTurbo256

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Re: X20xev fuel consumption
« Reply #27 on: October 08, 2013, 19:55:25 PM »
True, but Chevrolet probably did have dealerships in Jordan. It was sold in south America n some other places, as a Chevrolet Calibra.

Offline fakhri

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Re: X20xev fuel consumption
« Reply #28 on: October 09, 2013, 07:39:29 AM »
Are you getting a loss in power as you try to accelerate, almost misfire? 

If it was your fuel sender you would have petrol leaking out under the tank, after the car has switched off.

If you are in Jordan I highly doubt you would have a rusted fuel sender unit, the only reason they rust is from the salt spread on the roads in cold winter months.  Dont think Jordan has ice or snow in winter does it?

to be true, the car's performance is more than perfect. and the fuel sender i have is not metal even, it is Plastic! we just checked it yesterday.. and yes we do have Ice, Snow, Rain, all kind of weather than can pop in your mind. we have the four seasons in here, but we don't use salt on the roads like you guys.

Anyway, yesterday was a very bad day for me, i spent 7 hours at another garage just checking for the problem i have, and guess what?? NOTHING! the only thing we found is that the fan work on 90 like it should be, but never turns of! (the first speed) and the temp do drop and thermostat is working ok, then goes back up to 90/92 and then 85 or so, but the fan never turn of until i switch off the car!!!! today i will go to another garage to check this "knowing i changed/replaced the (thermo switch) 3 times yesterday, and still the same" 82-92 / 85-90.

no gas leak, no gas smell, nothing.. the lambda sensor is going ok, no faulty cods AT ALL!

Please if anyone knows something, or suspect anything.. you are welcomed to help me,, please

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Offline fakhri

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Re: X20xev fuel consumption
« Reply #29 on: October 09, 2013, 07:41:09 AM »
I dont think vauxhall had any dealerships in jordan, therefore, import. From some sh*tty country where it rains  >:(
Im prob wrong,but anyway  ::)
we have Opel in here, it is not called Vauxhall in the Middle East.. and yes we have one, but it will cost me ALOT if i send her there! even they are not that good and we prefer private garages, they know better!
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Offline fakhri

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Re: X20xev fuel consumption
« Reply #30 on: October 09, 2013, 07:44:31 AM »
guys, Jordan is a country where you can find everything in, we are civilized people guys :) but things are not like UK and USA, but we are better than most middle East countries by far more! so, stop making me feel i'm living in a sh!T hole :D ;)  LOOOL

LOOOL :D
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Re: X20xev fuel consumption
« Reply #31 on: October 09, 2013, 10:40:27 AM »
The average UK citizen couldn't tell the difference between Jordan, Israel, Palestine, Syria, or even Iraq, I wouldn't get too upset over it.

My wife used to assume I would be living in some mud shack when working in the far east, until she saw some of the pictures of singapore, or kuala lumpur in malaysia, or seoul in korea, or shanghai in china.

Offline CalyTurbo256

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Re: X20xev fuel consumption
« Reply #32 on: October 09, 2013, 19:10:52 PM »
guys, Jordan is a country where you can find everything in, we are civilized people guys :) but things are not like UK and USA, but we are better than most middle East countries by far more! so, stop making me feel i'm living in a sh!T hole :D ;)  LOOOL

LOOOL :D

Nah we weren't my image of Jordan was as any other middle eastern country, civilised but f*ckin hot weather, I thought Opel was just sold in Europe, so guessed Chevrolet like in south America.

 8)

Offline tranceaddict78

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Re: X20xev fuel consumption
« Reply #33 on: October 09, 2013, 19:45:24 PM »
True, but Chevrolet probably did have dealerships in Jordan. It was sold in south America n some other places, as a Chevrolet Calibra.
didnt know chevvy done a calibra. How cool....or not....?  So has OP got a chevvy calli? Opel calli? Vx calli?

Offline fakhri

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Re: X20xev fuel consumption
« Reply #34 on: October 09, 2013, 20:21:53 PM »
i love it there "the far east" .. and not upset at all mate :) .. i know a lot of guys don't know much.
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Offline fakhri

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Re: X20xev fuel consumption
« Reply #35 on: October 09, 2013, 20:26:12 PM »
hot comparing to UK! YES very much.. but we have snow in winter :) anyway, we are getting off the main issue here.. let me update you guys, today i changed the fan switch to 90-95c.. now it dose stop when gets 90 on the Tech1 .. and same again, the final test at another Garage came out clean! no faulty codes, everything is working just perfect.. and i will test it as they all told me it is a cooling thing.. we will see about that in the next couple of days..

fingers crossed
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