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  #13  
Old 02-15-2013, 04:26 PM
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Yep, as for right now im definately keeping her. She's too sharp and drives too well to get rid of over bad gas without trying to fix er. Im actually pretty excited to mess with it. Im not a car expert but it does feel good to be resourceful and fix/figure stuff out. Its just too damn cold right now! Lol
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  #14  
Old 02-15-2013, 05:08 PM
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Re: Improving Gas Mileage for a layman

The ntk o2 sensors come with "o2 safe" anti seize already applied to the threads. So no reason to get antiseize. I'm really not sure what size the o2 sensors are or if yours are even the same. I always do them with an adjustable wrench.... My biggest wrench at this time 18mm... And that is a few sizes too small. You may have a better chance of getting them out without damage with the proper size wrench. Adjustable wrenches can slip and cause damage. If I had to guess I'd say my o2 sensors are 21mm
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  #15  
Old 02-15-2013, 05:17 PM
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Re: Improving Gas Mileage for a layman

Here are a few pics of a couple I have sitting around. You can see the difference between front and rear. The electrical locking clip is slightly different so it's impossible to plug them in backwards. The sensing tips are different also
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  #16  
Old 02-15-2013, 05:21 PM
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Re: Improving Gas Mileage for a layman

Another
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  #17  
Old 02-15-2013, 05:33 PM
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Re: Improving Gas Mileage for a layman

thanks! i feel prepared to tackle this job now, and i'm fairly certain this is a contributing factor to my bad economy... I read a long and informative article by Jeepgcoman on O2 sensors, and it sounds like my symptoms.... Bad fuel economy at low rev and idle... I live in minneapolis so lots of idling and stop-and-go low rpm, coupled with the fact that I was trying to fix my efficiency by accelerating slower, causing a lower rpm on accel but also a more prolonged low rev. Then I gave up and drove like an obnoxious city driving 22 year old and actually got better gas milage driving like a dick! lol... now I'm just waiting till spring or a warm day.

really interesting thread actually
Oxygen Sensors and Their Role in Engine Management--A Primer
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Old 02-15-2013, 05:53 PM
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Re: Improving Gas Mileage for a layman

Yeah, jeepcogman is the ultimate jeep authority, very smart guy who helped me through my cam and head install. Don't wait too long to do the o2 sensors, because bad sensors can put a strain on your cats... Your engine is running improperly... If your engine is running too rich they can get loaded down with unburned fuel which will shorten their life. If your engine is running to lean your exhaust gas temps will be much higher putting a strain on your plugs, coolant, oil, and cats. You don't want to be spending 800 on new mid pipes, they are hell to install. Being in Minnesota all your bolts will be rusted up and very difficult. But I think you got some time... Not trying to scare you. How cold is it up there these days?
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  #19  
Old 02-15-2013, 06:27 PM
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Would you think that in my jeep the oxygen sensors cause a slow drop in idle below 500 rpm and cause a slight shake it only does this when warmed up. 90,000 XK 4.7 V8
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  #20  
Old 02-15-2013, 07:01 PM
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Re: Improving Gas Mileage for a layman

It may be the case, that is a lot of miles on your o2 sensors. It's my understanding that when your jeep is not warmed up it runs in closed loop meaning it is just running a preprogrammed air fuel ratio. That's why it runs more badass and smells really good for the first minute of operation. Once warmed up it goes into open loop and the readings from the o2 sensors determine your air fuel ratio. If it only happens when warm I would suspect the o2 sensors
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  #21  
Old 02-15-2013, 07:06 PM
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Yep first sign of warmth i'll be under it. My wifes already giving me crap cause ive been doing so much research and "dreaming" lol. Have to admit, Ive been looking at fun stuff to put into the new jeep as well . It was 10 degrees today... too cold to be messin under the hood!
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  #22  
Old 02-15-2013, 07:15 PM
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Re: Improving Gas Mileage for a layman

I like to say with properly updated plugs, o2 sensors, engine oil, egr valves, and map sensors there is no reason why our engines cannot go 200-300k with how well synthetic oils protect these days. When I pulled my cam out at 83k it looked and felt like brand new. My heads were frickin beautiful too.... Being overly anal about oil changes only matters if your going to keep your jeep for a long time... But at walmart oil is just so much cheaper than autozone, oreillys, advanced autoparts, dealerships, etc. it's not that expensive to just change it out at 3-5k. I just don't understand who buys oil for 8.99 per quart at autozone when you get a 5 quart jug for $25 at walmart.
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  #23  
Old 02-15-2013, 07:18 PM
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Re: Improving Gas Mileage for a layman

Let us know when you get a itchy trigger finger with the mods, I'm sure the 3.7 guys will give you thumbs up or down. Never really checked out the 3.7 performance love thread, but its like a mile long. Lol. Cheers mate, stay warm up there.
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  #24  
Old 02-16-2013, 08:37 PM
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Re: Improving Gas Mileage for a layman

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Originally Posted by DannyVtCa View Post
It is unlikely your o2 sensors have been changed. You might want to pull a few spark plugs and check their condition also. Air filter (15), plugs (20), o2 sensors (120), egr (40-50), pcv (20) and you just did a tune up for 200 dollars. The dealer would probably charge you 200 in labor depending on where you are. In vermont the labor rate was 75, here in california the labor rate is 120... I refused to pay either. A good local independent shop can do all those very, very easy also for less than a dealer. Shop around online, look for deals, you can get it much more reasonably and likely with free shipping.

Hemi egr's start to go at 50k. Our plugs need to be changed every 25k. I think of it in these terms. Is my time after work worth $100 an hour I'd pay a mechanic to do the job? Man, I wish I made $100 an hour
just checked all these parts on rockauto.com and it shows $190.81 shipped to my doorstep. even splurged and picked bosch platinum+2 plugs. however, it's only showing one o2 sensor from NTK (part # 23159). is that the number for both o2 sensors?
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