high fuel air ratio
#1
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Car: 1988 Camaro (Z28 Clone)
Engine: 305 4bbl roch
Transmission: 700r4
Axle/Gears: 3.42
high fuel air ratio
my car is running really lean 18-1 F/A mixture and its really hurting gas mileage right now and i cant seem to figure out why its doing that... any ideas anyone?
thx
thx
#2
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Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
Have you changed the O2 sensor? How old is the O2 sensor?
Also, have you done the usual maintenance stuff, like fuel filter, air filter, plugs?
BTW: typically a slightly lean mixture at highway speeds would result in better fuel economy. But 18:1 is too lean.
Also, have you done the usual maintenance stuff, like fuel filter, air filter, plugs?
BTW: typically a slightly lean mixture at highway speeds would result in better fuel economy. But 18:1 is too lean.
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Car: 1988 Camaro (Z28 Clone)
Engine: 305 4bbl roch
Transmission: 700r4
Axle/Gears: 3.42
the air filters and fuel filter is new, the mechanics said the o2 sensor is fine but im not sure because the car sat for a really long time before i bought it.
at the end of the month im going to put new plugs in it and an o2 sensor and if it doesnt work i`ll post back.
thx
at the end of the month im going to put new plugs in it and an o2 sensor and if it doesnt work i`ll post back.
thx
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Car: 92' RS
Engine: 357
Transmission: TH350
Axle/Gears: 4.10
Please do. Unless they are using a wideband (doubt it) i would question their accuracy. Being a 18:1 AFR i dont see how that would be causing that much of a loss of gas mileage. I can understand it causing bad gas mileage giving that something is off, but not enough to be causing a significant or noticable loss.
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Car: 92 Form, 91 Z28, 89 GTA, 86 Z28
Engine: 5.7 TPI, LG4
Transmission: 700R4, 700R4
Axle/Gears: 3.27, 2.73
If you're using a cheapo af meter that just reads the normal O2 sensor, then your problem could be the O2 sensor, because if it's showing false lean, the ECU will overcompensates rich, and thus screw your mileage.
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#8
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Originally Posted by RednGold86Z
If you're using a cheapo af meter that just reads the normal O2 sensor, then your problem could be the O2 sensor, because if it's showing false lean, the ECU will overcompensates rich, and thus screw your mileage.
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