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  #25  
Old 02-08-2013, 01:21 PM
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Re: Where to Start...

My advice is just drive it for now. Make sure it's mechanically ok. Your gas mileage is pretty bad, but calculate it by hand to make sure it's not the evic that's wrong.

Keep in mind that the v8 guys will always have that kneejerk reaction that you should have got a v8. But in reality there are a lot of 3.7s out there and they'll get you pretty well anywhere you want to go. I've taken mine into some pretty hairy situations...snow..mud..Montreal roads. No mods, no problems.
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  #26  
Old 02-12-2013, 07:12 PM
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Re: Where to Start...

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Originally Posted by Hacksaw View Post
I thought I had posted but its gone now...Did the mechanic say what the stored codes were? Need to determine which o2 sensors are malfunctioning they can cause problems. Also the WJ's had an internal sock and external filter with fuel pressure regulator that is described how you described the manual for yours. Many WJ owners experienced large mpg gains after replacing it $30 and 30 minutes that's cheap and easy ROI. Some people swear by seafoam and claim it cures everything from burning oil to crappy mileage...cheap and won't hurt anything. Another item overlooked is a real injector cleaning there are lots of dump in the tank products out there but not to sure how well they work. Check out a shop that sells BG products and ask them how much for an injector cleaning. Lastly if the guy didn't tell you the codes (P numbers) you can go to many auto parts stores and borrow an odb2 scan tool and retrieve them. There is a post in the Jeep technical discussion forum that lists them.

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First off let me begin by extending one Hell of an Awesome THANKS !! Much Appreciated... like ... really appreciated.. it's great to have help in area of expertise that I have no clue on what I am even dealing with but.. I am on my way to learning.. and maybe ONE day I will be able to help someone like I am being helped. Anyways...

Unfortunately no the mechanic did not give me the code number ... I never even thought to ask.. all he had to say was that it had to do with one of the two/or both 02 sensors on the CAT.. and maybe even the CAT itself is going bad (this is what his description of that stored code is).

As far as SEAFOAM.. I will head to ADVANCE tomorrow and grab it.. I was at my local NAPA AUTO today and where they didnt have that "BG" product (BG 44K) that you were referring to.. I grabbed a bottle of Valvoline Fuel Injector and Valve cleaner for slightly over 3 bucks and dumped her in and filled 'er up .. so for the time being until I can do some more research I figured it wouldn't hurt and at the VERY least maybe it's actually help out.

When I head over to ADVANCE tomorrow I will ask them if they have a odb2 scan tool that I can utilize and see what the code is that way.

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Originally Posted by Yillb View Post
Deuce, for one, Hacksaw is right. Check the o2 fo shizzle. Another thing to check, the car's got 80k miles.. when was the last tune up done ?

And are you doing the mileage by yourself, or are you using evic.. if evic is saying that, please do it by hand the mathmaticcal way.. computers can fail , it could be wrong.

Also, when your driving on the freeway, after about 5 minutes of it, hit reset on the EVIC, see what the FIRST average is.. then watch the number drop, is it dropping as you have cruise control on, are you going faster than normal, every 4 - 5 minutes hit reset.. see if you can find a trend.

if your resetting it, and it's starting at 18.. then working it's way down, while going the same speed I.E .. 65, then check for codes ( even if the lights not on, it may have a code ) , aside from that, i'll let the others pop in answers. as i don't really know. I just know my evic says i get 21 with my tires and lift.. and before that i could once in a while hit 25 ( flat lands , in texas ) .

Also side note.. how many people are in the truck when you get 13mph, do you have a bunch of gear or anything in it, hows the tire pressure ?
Well as far as I know, there is no record of any Tune Up being done.. so I guess I should consider that option.. (not even sure what a tune up consists of but.. i know they routinely need them **all vehicles.. obv not just Jeeps** Is there a way to tell if it has been done recently? Because it would be a bummer to get it scheduled and done only to find out 7000 miles ago *75k* that the previous owners got a tuney.

Right now I am doing the mileage BOTH ways.. and I am within .3 of what the EVIC says and what my MATH is telling me... and most of the time it has been spot on.

I will definitely give that A Try the next time I hit up the actual highway.. sure.. out in the country in MAINE it's basically a highway (speed limit of 55mph everywhere) ... but as far as the interstate traveling. it's a rarity that's for sure.

SIDE NOTE ANSWER: The most amount of people I have had in my vehicle at one time is either 1) 200lb man, 2) a 150lb man and a 95lb woman.. or 3) My 85lb Pitbull *who is basically always with me* ... but as far as "GEAR" .. nothing really.. i travel pretty light.. a backpack plus my "Self defense protection .. aka TRUCK GUN"

ONCE AGAIN THOUGH.. Thanks for all the help bro.. this place is definitely a place I am glad I signed up for !! You guys are the best!!
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  #27  
Old 02-12-2013, 07:23 PM
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Re: Where to Start...

Quote:
Originally Posted by Archer9 View Post
My advice is just drive it for now. Make sure it's mechanically ok. Your gas mileage is pretty bad, but calculate it by hand to make sure it's not the evic that's wrong.

Keep in mind that the v8 guys will always have that kneejerk reaction that you should have got a v8. But in reality there are a lot of 3.7s out there and they'll get you pretty well anywhere you want to go. I've taken mine into some pretty hairy situations...snow..mud..Montreal roads. No mods, no problems.
Thats pretty much what I am doing, really have no choice since it's my daily driver... just sick and tired of staring at the Check Engine Light.. or whatever it is.. just.. not a happy thing to stare at if you just purchased a vehicle.. no matter what it is.

Yah, I am totally with you on this whole 3.7 V-6 not being a bad thing.. in fact.. I just looked at a 2013 Jeep Grand Cherokee Overland today.. those are around 46,000 dollars and they come with a 3.6l V-6 290hp Engine.. which.. blew my mind.. I can't wait to have this paid off because I fell in love with that thing today.. hahaha.. those 20" wheels look BEAUTIFUL on it.. and seriously.. if they would FIT on mine, I would very much consider purchasing them.. just for the appealing look of them.. hahaha!!

MAINE just got hit with the biggest "BLIZZARD" ever on record.. where I live our final snowfall total was 34.7" of snow in 24 hrs. And never not once did my Jeep even think of having a hard time.. she bulled right through literal 4.5' snow drifts like they were nothing.. an easy 10+ inches on the main roads and no sign of plow trucks.. didn't matter.. she ate it right up!! I am HIGHLY Impressed with it's performance in the snow.. (It has brand new 245/60/17 Cooper Discoverer AT3 rubber on it)..

So all in all.. so far.. Very Happy with my first of MANY Jeep purchases.. I am that confident (provided something doesn't go drastically wrong..) that I will remain a Jeep Guy permanently.
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  #28  
Old 02-12-2013, 08:19 PM
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Have you gone to the jeep owners site and registered it yet ? If you create an account and register your vin you can see the "build sheet" showing all factory options, dealer installed options and service records (at least for when it was serviced under warranty at a jeep dealer), I know my records stopped at 90,000 until just before I got it at 110,000. It may not include everything but it's better than nothing. moparpowerconnect.com

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  #29  
Old 02-12-2013, 08:58 PM
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Re: Where to Start...

Hey deuce, welcome to the forum. Holy crap, you guys got it hard there. My home state is vermont and we didn't get hardly anything, only 6 inches of snow. Anyway, ill put my 2 cents in. 80k you need new spark plugs. To check these pull one out and see if it looks like crap... Burned, corroded, white, etc. when doing this pay attention to each cylinder because spark plugs will tell you whether you injector for that cylinder is Working properly. With your code you could have bad o2 sensors... Which is probably the case. If all your spark plugs are good except for one, that injector is probably bad. Your plugs must be gapped correctly, so check that too. make sure they are the proper plugs to begin with.

Bad spark plugs can lead to the computer trying to recalibrate the air fuel mixture... And if they are all bad and at different stages of decay your in some trouble. Unburned fuel... Hence bad fuel economy... Will be pumped down your exhaust into your cats. This is something that kills them. This fuel will also begin to foul the o2 sensors.

Don't be alarmed. Get some new plugs, not that bad $$$. Get some new o2 sensors. After that if your cats were killed by the improper maintaince of previous owner just buy a few cheapie magnaflow cats and them welded in there. See if your air filter is clogged also. If you have an injector problem your plugs will tell you... And those are easy to pull and replace... Maybe $30 bucks for a new one.

All and all, woman aren't the best maintainers of cars. When I met mine she hasn't changed her oil in 11k miles... Hahaha.
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  #30  
Old 02-12-2013, 09:07 PM
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Re: Where to Start...

Egr and map sensor are also important services with you milage. All and all, without buying cats your looking at 200-300 for plugs, o2 sensors, egr, map. All very easy to do yourself and can be done in a manner that you can still drive in to work the next day. If you need new cats a local welding shop can do it... I think Maine has loose emissions laws too. Cats should not cost more than 100 each.... Forget about the expensive ones.

Just check your plugs for signs of richness, lean, or just being totally worn out.
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  #31  
Old 02-12-2013, 09:26 PM
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Re: Where to Start...

One other thing if you're strictly in town doing the red light thing 12-13 isn't terrible. That's around what I get if I pop on the highway a time, or two it will avg around 17- 18. If i'm on the highway for a while 21-23 of course this all depends on how heavy my foot is at the moment.
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  #32  
Old 02-12-2013, 09:36 PM
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Re: Where to Start...

I get 12-13 around town and mine is a real fire breather. What's the point to a 3.7 if it gets the same as a 5.7 for in town mpg?
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  #33  
Old 02-12-2013, 10:37 PM
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Re: Where to Start...

The 5.7's I've driven don't get that when I drive them in town. I drove one, and used a half a tank in no time that's when I made my choice. it's really not a debate anyway we have our trucks, and I'm perfectly happy if you want to race I do have something a little sportier Ok?
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  #34  
Old 02-12-2013, 11:17 PM
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Re: Where to Start...

I'm not putting down your rig, I don't believe that 3.7 gets same milage as hemi. Stash was saying his gets 12 mpg in town. They must get 13-14. Just trying to help this guy out, since he isn't throwing p420 or p430 codes yet he has a chance to get his rig running right.
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  #35  
Old 02-13-2013, 12:17 AM
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Re: Where to Start...

I'm glad you're not putting it down it wouldn't work anyway I've driven all of them before Ipurchased it. I didn't do any technical measurments I just watched the gauge move after driving them. Mine is sitting at 13.4 right now the tire presssures are lowered for snow travel, there has been snow here for a week now, vehicles use more gas in the winter, and have you driven in NY traffic anytime lately.
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  #36  
Old 02-13-2013, 12:17 PM
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Re: Where to Start...

Its a bit warmer here, traffic is much the same though.... traffic lights everywhere and stop and go traffic on the highway... frickin' nightmare... i much prefer country dirt roads. Duece, a lot of people trade their car in when it doesn't feel like it is running well anymore.. sounds like this lady who had the car before.. saw a check engine light and ditched the rig as fast as possible. What they don't realize is that it just takes common spark plugs, EGR, lubricants, etc. to bring it back to life. If your fuel filter was bad you would be getting a code for that. Also, differentials need to be drained every 15-30k... the rear is easy to check. See if it is light colored and creamy, ie... water and moisture have ruined the gear oil. A Jeep is a Jeep, no matter 4.0, 3.7, 4.7, or 5.7 engine, they all are intended for the same thing.
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