D2 Fuel Consumption

**mrapocalypse** · 26th March 2015, 11:02 AM

My V8 seems to get better economy on LPG than on petrol.

Which it shouldn't AFAIK.

In fact it gets about 16-18l/100Km on gas and about 22L/100Km on ULP.

Would this be a sign that a particular sensor is playing up.

Could it also be a sign that there is something amiss with the gas system that is taking the fuel system computer time to readjust to?

Any thoughts would be much appreciated.

It's in good nick and has new MAF but original O2 sensors.

Thanks in advance.

Ian.

**PhilipA** · 26th March 2015, 01:20 PM

How many Ks?
Any error codes?
You could have dead o2 sensors or drooling injectors, or dead engine temp sensor.
Best to run a check with a diagnostic tool a the first action as Motronic should not be so bad on fuel and they have a good fault reporting system.
Regards Philip A.

**mrapocalypse** · 26th March 2015, 03:20 PM

Hi,

Thought so. I'll get them to replace the o2 sensors on the next service anyway and make them aware of the consumption fact.

No faults have showed up that weren't fixable in the last while and its had a lot of work done on it.

Cheers

Ian.

**ballbag** · 27th March 2015, 10:02 AM

Mine runs the exact opposite - 22L/100km on gas, 16L/100km on petrol. I've kept thorough logs and these figures haven't budged.

Is this a recent phenomenon for your vehicle?

I can't see how any sensor would result in a 50% increase in fuel consumption. Is the ECU capable of prescribing such a rich mixture?

Bung injector or a leak elsewhere is my guess.

A faulty coolant temp sensor would likely show up as a hunting idle.

**mrapocalypse** · 27th March 2015, 10:11 AM

Hi,

No not recent, but because we have a 160l fuel tank, it tends to be a difficult process to get an accurate idea of fuel when we predominantly use LPG.

And it's hard to do a certain distance then fill to the brim. But that's what I'm going to do soon.

It is using way too much ULP. Runs beautifully though. Smooth as a baby's ??..

**Modelsp** · 27th March 2015, 10:28 AM

Originally Posted by mrapocalypse

Hi,

Thought so. I'll get them to replace the o2 sensors on the next service anyway and make them aware of the consumption fact.

No faults have showed up that weren't fixable in the last while and its had a lot of work done on it.

Cheers

Ian.

Get a quote on the O2 sensors beforehand
unless you have a bottomless bag of money
I got mine from British Parts of Utah in the US
2 for the price of one over here and genuine Bosch.
just my 2bobs worth.
cheers
Paul

**mrapocalypse** · 27th March 2015, 03:55 PM

Yeah, I heard the same. Ford falcon ones that you need to solder the ends on etc..

Also there's meant to be some higher performance ones as well.

**ballbag** · 27th March 2015, 07:25 PM

Try Amazon:
[ame="http://www.amazon.com/Bosch-15175-Oxygen-Sensor-Fitment/dp/B0018R5SOW/ref=sr_1_1?ie=UTF8&qid=1427448242&sr=8-1&keywords=discovery+2+oxygen+sensor"]Amazon.com: Bosch 15175 Oxygen Sensor, OE Type Fitment: Automotive@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41cHySp2PSL.@@AMEPARAM@@41cHySp2PSL[/ame]

**Pedro_The_Swift** · 28th March 2015, 08:53 AM

"160L fuel tank"

thats LPG, right?

wow! I'm suitably impressed!

what tank did you stuff in the rear?

**Fluids** · 28th March 2015, 10:10 AM

Originally Posted by Pedro_The_Swift

"160L fuel tank"

thats LPG, right?

wow! I'm suitably impressed!

Why ? On 160L of LPG it still wouldn't go as far as a rattler on a std sized tank of dieso !!

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