Help, I am getting 10 mpg from my VX

[ahmedomnnea]

Hi everybody,

The title shows my problem simply, I'm getting barely 10 mpg from my (2001 Holden VX), which means a little more than 25L/100Kms.

Please Help, what do I need to do? this is my yahoo ID : ahmed12111983@yahoo.com

if there is an expert who can help me, please do.

[accentstencil]

I am by no means an expert but one of the main reasons for high fuel consumption is faulty oxygen sensors. A good start would be to read the fault codes and see what comes up. Do a search on how to read fault codes, it has been discussed many times here.

[0081]

Hi everybody,

The title shows my problem simply, I'm getting barely 10 mpg from my (2001 Holden VX), which means a little more than 25L/100Kms.

Please Help, what do I need to do? this is my yahoo ID : ahmed12111983@yahoo.com

if there is an expert who can help me, please do.

Why are you using MPG you might get better help if you just use xxL per 100kms???

Have you had a service done? i would start here frist

[nick3110]

lol he did... he's probably a yank...

but yeh as accent said possibly the Oxygen sensors, or ur foot is made of lead.

[ahmedomnnea]

My foot is very light, in fact I drive like an old lady, my tacho meter does not exceed 2500 rpms, but the wierd part is: that the instantanous fuel consumption on the dash looks very good and reasonable, bu when it comes to Kms gotten by a full tank it does not exceed 260kms which is very sad and annoying because I have to spend a fortune to run this car accros the month.
any more help will be highly appreciated.

[nick3110]

ok then.. try the oxy sensors..

[bricat]

Start with basics. Plugs and leads.

[bozz73]

Have you still got the cat converter fitted?
Maybe it is blocked and needs replacement.

[burnz]

clean MAF meter and EGR valve.
replace O2 sensor's, plug's.

look for creased exhaust (speed humps) and blocked cat's, resonator, mufflers.

[lout]

a bit more info on your car please V8 or V6?, auto or manual? stock or modified? If modified what have you done? How have you calculated this? how many litres at the pump and how many kays you drove then fill again or are you basing it on the dash computer?

[bozz73]

His ride is a V6 dunno about auto or manual
He's been trying to sort this for a while if you search his forum posts....

[lout]

I just searched all posts, sounds like a stock V6 manual. go into engineering mode on your dash and check your coolant is reaching operating temperature or the car wont go into closed loop
Diagnostic mode.
“With ignition off press arrow up and mode together, then switch ignition on, then
release buttons”
You can start and drive in this mode if you want, will revert to normal when ignition
is turned off.
Press mode button to move to next item.

GM software part number
Trip computer switch voltage eg 5.0
Mode button (hold for more than 2 seconds) eg 3.9 – 4.28
Up arrow (hold for more than 2 seconds) eg 3.26 -3.55
Down arrow (hold for more than 2 seconds) eg 2.43 – 2.71
Battery voltage eg 13.8
Petrol sender voltage eg 3.2
LPG sender voltage eg 5.0
Remaining fuel in litres eg 38L
Instantaneous fuel in litres per hour eg 3.0 L/H
Engine coolant temperature eg 63C
Current speed in KM/H eg 60 KM/H
Tachometer eg 700
Park light switch on or off eg P OFF
Dash trouble codes eg T00 - - use arrows to scroll through codes .
Dash self test - all gauges will move, buzzer will sound and all lights will illuminate.

Dash trouble codes. NOTE! These are not BCM codes!
Display format is fault code then status of code.
H = code in history.
C = code is current.
– = code has not occurred.
T00 Fuel gauge sender unit – open circuit (a duplicate of T03)
T01 Fuel gauge sender unit – short circuit
T02 Fuel gauge sender unit – intermittent
T03 Fuel gauge sender unit – open circuit
T04 LPG gauge sender unit – open circuit
T05 LPG gauge sender unit – short circuit
T06 LPG gauge sender unit – intermittent
T08 No serial data from ABS
T09 No serial data from BCM
T10 No serial data from ECC
T11 No serial data from PCM
T12 No serial data from SDM
T13 No instrument poll from BCM
T14 No serial communication
T16 ABS fault logged
T17 BCM fault logged
T18 ECC fault logged
T19 PCM fault logged
T20 SDM fault logged
T24 EE checksum failure
T25 ROM checksum failure
T26 Internal fault

Eg T00 - - means fuel gauge sender open circuit has not occurred = OK.
T00 H - means fuel gauge sender open circuit has occurred but is okay now.
T00 HC means fuel gauge sender open circuit has occurred and is still faulty.
you may get imperial measurements, not sure what they changed for export models
. any idea of the fuel octane in Iraq? with the car breathing hot air and air con on all the time you may not get much better, do you know anyone else "over there" that has a commodore that you could compare to.
Andrew

[radon]

have you got a hole in your tank ?
check for puddles with a match

[affinity]

What about the possibility of fuel siphoning? If the fuel usage on the computer looks okay, then siphoning _might_ be the problem.

[Warface]

have you got a hole in your tank ?
check for puddles with a match

lol, Im sorry but had to laugh at this!