O2 sensor - Gas mileage improvement?
- Thread starter '92SHO
- Start date
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SilverSHO
SHO Member
That's not bad at all, considering the speed. But yes, fresh O2 sensors will help improve your gas mileage. Old sensors will not do their job as efficiently, and the EEC will not get the correct readings from them, which will affect fuel economy.
Mr Anonymous
Tire Wall
Are the O2 sensors generating trouble codes? If so, you may see some improvement. If not, I suspect you wouldn't see more than an additional mile per gallon.
You'd be more likely to see improved fuel effieciency with routine maintenance including a 60K service with new plugs, valve adjustment, etc. FWIW, 23MPG highway at 75 isn't that bad...
sdpatt
Sr. SHO Engr.
See page two of this informative Wells Manufacturing link regarding the performance of oxygen sensors. An old or contaminated sensor "becomes sluggish... causing emissions and fuel consumption to go up." You can benefit from replacing your sensors at the same intervals as your spark plugs according to this article.
<small>[ March 26, 2003, 01:50 PM: Message edited by: sdpatt ]</small>
<small>[ March 26, 2003, 01:50 PM: Message edited by: sdpatt ]</small>
NotSoSlowSHO
Gas is $$ WALK!
It isnt all that bad...
but somehow my '89 still manages 29-32 mpg at 75-85mpg
road trips are great thumbs_u
around town sucks... I get about 18mpg squint
TVSHO
New Member
I replaced both my 02 sensors in December after one threw a code. I saw a 1-2mpg improvement and now get about 23-24mpg city/highway mix....so I wouldn't say it's a major improvement. Highway only nets me approx. 29-30mpg.
Tom
'94 ATX
rendyx
New Member
Just an odd question, would code 41 (rear bank lean) have anything to do with an O2?
projectSHO89
SHOless In St L
rendyx,
Yes.
It means that the sensor is still showing lean after the adaptive fuel management reached its enrichment limit.
This may be due to a bad sensor, a vacuum leak, or even a weak injector.
Steve
Yes.
It means that the sensor is still showing lean after the adaptive fuel management reached its enrichment limit.
This may be due to a bad sensor, a vacuum leak, or even a weak injector.
Steve
NotSoSlowSHO
Gas is $$ WALK!
no, your car sucks boink Gas that is
Unless your car lives at 4k + RPMs... it needs some serious maintenance. There is no reason for such lousy HWY gas mileage.
shojuan
New Member
On the other hand the mileage you are getting on the highway is just crazy!NotSoSlowSHO:
no, your car sucks boink Gas that is
Unless your car lives at 4k + RPMs... it needs some serious maintenance. There is no reason for such lousy HWY gas mileage.
29-32 mpg at 75-85 mph! What, do you have super low rolling resistance tires, a perfect wheel alignment, brand new wheel bearings at all four corners, and all new suspension components not to mention an immaculately maintained engine? I can't see what else would get your 89's mileage up that high. No matter what I do I get about 22mpg. Well, I think after the Pinnacles run this last weekend I'll be getting a little bit lower than that!
PROPHET
Well-Known Member
Im about the same on highway,and better than that around town.NotSoSlowSHO:
It isnt all that bad...
but somehow my '89 still manages 29-32 mpg at 75-85mpg
road trips are great thumbs_u
around town sucks... I get about 18mpg squint
TVSHO
New Member
Rick...my 94 ATX gets 30mpg on Summer highway trips with the 3 people, luggage and the AC cranking! After topping off the gas tank I can usually go ~450 miles before the gauge hits "E".
And that's averaging 70+mph.
Tom
'94 ATX
Don likes SHO
New Member
I'm also thinkinging about replacing my O2 sensors when I install the off-road equal length 2.25" Y pipe on its way from the SHO Shop. I'm not going to do it yet just to save $.
I got 27.8 with the cruise set @ 75mph. This was with plug gap eroded to .080 and oil in the wells. The original owner I bought the car from was honest, he said it gets slightly over 30mpg highway only. I believe(d) him. I get 22-23 horsing around town mixed driving. My worst when I first got the car and was trying for land speed records was 20mpg.
I would also suggest cleaning the MAF with electrical contact cleaner then resetting the computer.
FYI my 3.0 is due for its 3rd 60K in 20K and has a stack of maintenance records - including dealer window sticker
I got 27.8 with the cruise set @ 75mph. This was with plug gap eroded to .080 and oil in the wells. The original owner I bought the car from was honest, he said it gets slightly over 30mpg highway only. I believe(d) him. I get 22-23 horsing around town mixed driving. My worst when I first got the car and was trying for land speed records
was 20mpg.I would also suggest cleaning the MAF with electrical contact cleaner then resetting the computer.
FYI my 3.0 is due for its 3rd 60K in 20K and has a stack of maintenance records - including dealer window sticker
91 SHOplus
Sholess 4 Now
What gas are you using; economy, mid-grade, or premium?
What could i possible due to help the mileage out. I tried my very hardest not to get on it during one tank and i got on it 2 times for like 10 seconds each and i average 18 with some highway(at 90). It has newer plugs,wires i also have c and l no sample tube, exhaust, and it just sucks gas i think i will be doing a sixty k soon
JoeHoe_SHO
SHOPUKE
I would run 93 oct...It keeps the engine cleaner, burns cleaner and better for high revs
What could i possible due to help the mileage out. I tried my very hardest not to get on it during one tank and i got on it 2 times for like 10 seconds each and i average 18 with some highway(at 90). It has newer plugs,wires i also have c and l no sample tube, exhaust, and it just sucks gas i think i will be doing a sixty k soon
