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KCWW
Dodge Dakota
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10/03/2007
14:23:51
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 Subject: o2 sensors
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Message:
Need some opinions... gonna do a tune up on my '99 3.9 (new plugs, wires, rotor and cap) and put in a drop-in K&N air filter. My truck has 120,000 miles on it and original oxygen sensors. Should I replace them now or wait until I have a noticable change in mileage? Currently, I'm getting about 17 on highway/15 in city...so no changes since I bought it new in late '98.
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daddio
Dodge Dakota
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10/03/2007
14:56:23
| RE: o2 sensors
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is that really the best you've gotten since new? you must have a 4x4, CC, Auto. my '00 QC 3.9, 4x2, 5spd w/ 3.55:1 & 235/75/15 tires gets 23-24 hwy and 17-19 city. i usually don't recommend changing them unless it checks bad, throws a code or gas mileage takes a sudden dump. i've seen O2's go over 130k miles.
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KCWW
Dodge Dakota
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10/04/2007
15:05:54
| RE: o2 sensors
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Message:
I have a CC 4x2 and get those numbers most of the time. I usually don't hit the throttle hard, only when I need to pass or keeping up with traffic on hills, etc. (Cincinnati is pretty hilly).
Now I'm wondering if I should have replaced the o2 sensors a long time ago....maybe they're bad and that's why my mileage stinks.
I also had what Larry calls the death flash shortly after I bought the truck due to pinging.
That could be the issue too, huh?
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daddio
Dodge Dakota
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10/04/2007
15:28:27
| RE: o2 sensors
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Message:
yep, the death flash can do that. you could get a new NGK/NTK O2 sensor from Summit or Jegs in think relatively cheap(30-40 bucks). change just the front.
and you can re-gain some of the timing that the death flash took away by doing the CPS mod. very easy to do.
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KCWW
Dodge Dakota
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10/05/2007
17:21:14
| RE: o2 sensors
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Message:
daddio,
Do you recommend only changing the front o2 sensor to save me some money (because the rear sensor is probably ok) or to change the way the engine performs from the death flash?
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daddio
Dodge Dakota
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10/05/2007
17:42:03
| RE: o2 sensors
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Message:
the PCM uses the front O2 to adjust fuel as necessary and the rear O2 is just to tell the PCM if the cat is bad or not. so, yes you can save a little by just changing the front O2.
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