Vz bad fuel economy? ?? HELP

[Marso96]

So if I get someone with a tech2 to delete the rear sensors from the bcm my car should hopefully get better economy? Is that what you guys are saying. Just to throw this out there ever since I did the rear 02 sensor I haven't copped a powetrain error since

 

[duce9757]

How long ago did you change the rear sensor?
i use my obd2 reader to delete the code and after between two and 3 weeks it comes back, i'm due for a mafless tune in mid feb once all mods are complete. But i have contacted the tuner and he said he will delete the rear sensors which with stop the powertrain fault and the stop 2 codes.. as for the fuel economy, i did the exhaust the second day i had the car "i've owned the car for 2 months + i don't drive very far so i haven't noticed..

 

[Marso96]

I did the sensor just the other day. My impression was that extractors, cats and the exhaust itself should all improve fuel economy, not decrease it

 

[duce9757]

I am no expert
I'm only am telling you things i know from my experience with my new exhaust, and my tuners advice.. now my questions are just that questions..

I did the sensor just the other day. My impression was that extractors, cats and the exhaust itself should all improve fuel economy, not decrease it


yes but having the sensors confused by the incorrect reading you'd think may play with this? Or the fact that the car thinks the cats are stuffed "p0420 p0430 codes may send it as a powertrain warning.. then the car driving in limp mode may causing this hi use of fuel?

The car may be changing fuel ratios to check front sensors with rear sensors? "low Fuel economy"?
These are just some conclusions i have came too.. not facts

The rear sensors also check that the front sensors are working correctly.. I have been told..

 

[Marso96]

I did notice when I did the rear sensor the idle became better!
But driving around town with a light foot I'm sitting at an average of 14.7L/100km is this about right?

I think it's a bit high

Should I get a tune?

 

[XioiX1983]

I would change all the sensors first, then think about a tune, thy range from $500 to $1500.

 

[Benboy]

Until you have your car scanned (Tech 2) and identify what the Errors (problems) really are, any money you throw at it replacing components may turn out to be a complete waste.

 

[WazzaVN]

I did notice when I did the rear sensor the idle became better!
But driving around town with a light foot I'm sitting at an average of 14.7L/100km is this about right?

I think it's a bit high


Should I get a tune?

I'm going to get mine tuned after I replace the front oxy's. They can dissable the rear oxy's with a tune im pretty sure. Should get a cheap obd thing and check the codes. It's my oxys that are throwing codes after I did my extractors and cats.

 

[Marso96]

I changed the fronts today, I'll go fuel up soon and reset the trip.
What's people getting driving around town? A lot of start stop?

 

[1siknip]

what is your avg speed? if its around 30km/h then 14.7/100km is about right.