93 del sol bad gas mileage after new o2 sensor.
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93 del sol bad gas mileage after new o2 sensor.
Ok so after i put my new header on i drove the car 2 weeks with the o2 sensor gone. i bought a new one couple days ago and i noticed my gas mileage is alot worse than it was without one. im getn about 25 mpg now and when i first got the car i was getn about 33-35. What am i missing here. It has new wires, plugs, o2 sensor, oil, air filter. any help would be helpful thanks guys. James
#2
Re: 93 del sol bad gas mileage after new o2 sensor.
Was an O2 sensor code thrown prior to installing the O2 sensor? Are all CEL codes now gone since installing the O2 sensor? Has the ECU been reset?
#4
Re: 93 del sol bad gas mileage after new o2 sensor.
Post back after you been through a couple tanks of gas. The ECU is still likely in a learning phase. After that, gas mileage should improve.
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Re: 93 del sol bad gas mileage after new o2 sensor.
should be 4-wire o2 sensor, but that is strange, try unhooking the plugs that go into the ecu, count to 10-20 sec then hook it back up, make sure your not leaking any gas, i was at fpr, just dripping, but did not smell nothing, lmk what happens
#10
Re: 93 del sol bad gas mileage after new o2 sensor.
What brand O2 sensor? OEM? Other? A faulty O2 sensor could possibly be worse than no O2 sensor.
What brand wires and plugs? Have you inspected the cap and rotor? Is the ignition timing set to spec?
What brand wires and plugs? Have you inspected the cap and rotor? Is the ignition timing set to spec?
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Re: 93 del sol bad gas mileage after new o2 sensor.
its a bosch o2 sensor. direct fit. plugs are ngk stock spec. wires are from oreillys. im resting the car right now.
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Re: 93 del sol bad gas mileage after new o2 sensor.
Unless you have some new information, this is where I recommend you focus:
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Re: 93 del sol bad gas mileage after new o2 sensor.
here is wat done to the car. 4-2-1 header, gutted cat, stock exhaust to aftermarket fart can, omnispark wires, ngk plugs, new thermastat, new bosch 02 sensor, new pcv valve, new fuel filter. i have replaced and or added this stuff since i bought the car in feburary 2011.
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Re: 93 del sol bad gas mileage after new o2 sensor.
just cleaned the the rotor and cap. might be getn a new in morn to see if that help. there is oil just a lil bit in the cap. i did replace the distributor oring too.
#21
Re: 93 del sol bad gas mileage after new o2 sensor.
If there is oil inside the distributor, then the internal oil seal (not O-ring) is bad. You can replace the internal seal, or the entire distributor if it's old (~150K miles).
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Re: 93 del sol bad gas mileage after new o2 sensor.
well yesterday after noon i was on my way to pick up a new cap and rotor and on my way there i noticed my gas mileage was alot better!!! i left with a half tank and got there with 2 needles below half. i went 110 miles on a quarter of a tank and i never get that good of gas mileage im lucky if i get 100 miles from half to empty. i still bought a new cap and rotor anyway just to be on the safe side. Glade i got my gas mileage back.