o2 sensors - Dodge Dakota Forum

Subject: o2 sensors
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i have an 02 dak 3.9 2wd. just turned 70k on the speedo. Truck was getting really doggy and felt like i was driving around everywhere with the e brake on. as soon as i left of the gas it was slowing down. did a tune up with new factory plugs, new cap and rotor (brass)and the wires are performance wires and only about 3 years old so thought they should still be good. Also cleaned out the pcv valve real good, same as buying a new one! Truck runs MUCH better now but still just seems non responsive when you step on it but accelerates nicely but with not so much foot into the pedal. I did the TPS mod but it just seemed to affect the idle too much plus i kept thinking that if it was meant to be this way they would have done it from factory. I know, I know, this is not always true but still felt kinda guilty about doing it. I had done all the easy to do mods from here but truck never seemed to run right so put everything back to factory except air filter (k&n drop in) and exhaust (flowmaster 50 series) from cat back. recently been reading some things about k&n not being up to standards and letting dirt into the engine but k&n is a huge name right and i would like to think they wouldn't mislead the public but it's all about money so who knows!

When should i consider replacing my o2 sensors? I have no codes or any other problems currently to indicate o2 sensor problems but i don't assume that would necessarily mean i wouldn't gain anything by replacing them other than cost. Actually come to think of it, I always notice a lot of black carbon on my stainless exhaust tips but its not all over the truck like you see on some of these foreign cars that are all chipped out and running rich! This truck i think has two o2 sensors, correct me if i'm wrong. Should i leave em' till i have problems or replace them? Money is a bit of an issue right now, when isn't it??? Also hearing NGK sensors are the way to go, is this right? I'm checking my fuel mileage tomorrow when i top off with gas so i can't give any MPG right now.

J and J Auto
GenII

4/11/2007
18:15:39

RE: o2 sensors
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recomended reolaced 60 to 80,000 miles for o2

If you change the TPS volts you must start and
stop motor 3 times or it will not idle right

I just get a kick out of you guys that say the
mods don't work LOL

If you have bad or lazy sensors and do mods there
will be no change or it can even run worse

These mods have been proven over and over on
and off the dyno in 1/4 mile times and gas
mileage

Not all bad or lazy sensors will trip the mil
light but are still crap and you will never have
a good running truck

What you need to do is study how the system works
what does what and look closer at whats going on

My stock internal V6 with all the boltons and mods
is pulling 191 200 rear wheel HP from the average
truck running between 120 140 rear wheel

Thats a 60 hp gain at the wheels and just over 100
foot pounds of torque

The Mods Work you have something else going on
that needs to be taken care of

Larry
J&J Auto

ccman
Dodge Dakota
JOIN HERE

4/12/2007
00:15:32

RE: o2 sensors
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never said that mods didn't work. all i'm saying is that with my particular truck just doing these mods alone with no other bolt ons didn't significantly change the performance enough to be noticeable off the dyno, not too many of us have access to a dyno to really see what's going on. I'm also aware that mods compliment eachother and without spending the money to actually get some "bolt ons" i don't think i'm going to really notice a difference except for maybe MPG.

You also have a bit more mods than most people that just get on here looking for easy mods and not wanting to spend any big money. so to pull a 60 hp gain at the wheels by just doing the TPS, IAT, CIA, exhaust, timing mod, brass cap and rotor, wires, plugs, thermostat, i doubt it but i never had my truck on a dyno after those mods to really see so maybe i should shut up now!

I'm sure these mods help but for someone like me and probly hundreds of other people that are "what's really going on" illiterate, than just these mods alone aren't going to satisfy their anticipation of whats to come after performing them. Our first mistake is thinking we're going to get a rocket propelled ship, thats where we go wrong!

and also for those of us that aren't aware of just what the mods are really doing and why then maybe it's a good idea not to do them and just leave things at the factory level which is what i was refering to. we don't all work in the auto business.

anyways, checked the mpg today and i'm getting 20 on the highway, this is after tuning up of course. Haven't had a single thing wrong with the truck other than questioning when to replace o2 sensors. I don't really think any sensors are bad but at 70k it is possible.

also, wouldn't a cold air intake make you get worse MPG since your bringing in colder air and most likely going to run richer. or do you get the worse MPG because people stomp on it because it sounds cool?? I just know in the winter i get worse MPG when it's colder and always thought it was because the computer runs a richer mix because of the air temp. i'm not running a cold air intake now but was when i had the mods.

Problem Child
Dodge Dakota
JOIN HERE

4/13/2007
21:29:42

RE: o2 sensors
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I think my rear cat is going to fall off and be replaced by a straight pipe

P 1

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