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Old 02-12-2011, 06:32 PM   #1
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Spark plugs ? ( not what kind )

Hello,

I am getting terrible gas mileage on my 01 I have done everything including

02 sensors
Intake manifold leak ( p031 code )
Throttle body cleaned along with iac
Spark plugs
air filter
Mmo with fillups
Cold air intake ( kidding )

My jeep seems to run fine and oh ya I do have a 2 inch BB along with 31" tires ( actualy measure 30.5 ) 3:07 GR

The spark plugs were the first to be replaced
Ive done alot of research on these forums. I believe I have bocsh.

Will the spark plugs make or help me out, especially if I dont have a recommend brand? I'm going after the Autolite APP985 ( Jerrys rec. )
The counter dude said not to get these go with the copper saying it was bad for my engine??

I am not looking to increase stock mileage or I would buy a Honda, I'm looking to better my 9-10 mpg I'm getting.

Any advice would be great

Thanks, and I have done alot of furom searching and I've done most of the stuff covered and I got minor gains.

Ps... Excuse any typos I'm using an iPhone.

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Old 02-12-2011, 06:39 PM   #2
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The counter guy was not very astute in recommending you go with conventional copper core spark plugs for your 2001 TJ which has a DIS (distributorless ignition system) type ignition. Conventional plugs will only work well half as long in your DIS type engine as they will in older non-DIS style engines. He only would have been correct if you had asked for the single-tipped platinum AP985 (or Champion 3034) which won't work well for very long in your DIS engine.

The APP985 is a good choice, as is the XP985 (iridium) from Autolite or the Champion 7034. By the way, a bad 02 sensor can cause poor fuel economy by it tricking the computer into making your fuel ratio too rich.

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Old 02-12-2011, 06:56 PM   #3
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Thanks Jerry!

I drove around forever with the CEL untill I had the manifold gasket replaced. And then a month later same code p0431 two weeks ago I replaced all the 02's with NGK.

My next ? Would be, how bout an ecu reset. would that help?
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Old 02-12-2011, 07:06 PM   #4
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Resetting the ecm/pcm never hurts in such situations, I'd certainly try doing that.
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Old 02-12-2011, 07:18 PM   #5
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Thank u much!!!!
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Old 02-12-2011, 09:37 PM   #6
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How many mpg loss do to "winter gas"?

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Old 02-12-2011, 09:58 PM   #7
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Quote:
Originally Posted by kjeeper10 View Post
Hello,

I am getting terrible gas mileage on my 01 I have done everything including

02 sensors
Intake manifold leak ( p031 code )
Throttle body cleaned along with iac
Spark plugs
air filter
Mmo with fillups
Cold air intake ( kidding )

My jeep seems to run fine and oh ya I do have a 2 inch BB along with 31" tires ( actualy measure 30.5 ) 3:07 GR

The spark plugs were the first to be replaced
Ive done alot of research on these forums. I believe I have bocsh.

Will the spark plugs make or help me out, especially if I dont have a recommend brand? I'm going after the Autolite APP985 ( Jerrys rec. )
The counter dude said not to get these go with the copper saying it was bad for my engine??

I am not looking to increase stock mileage or I would buy a Honda, I'm looking to better my 9-10 mpg I'm getting.

Any advice would be great

Thanks, and I have done alot of furom searching and I've done most of the stuff covered and I got minor gains.

Ps... Excuse any typos I'm using an iPhone.
My 2001 Sahara 6cyl auto 3:07 with 31' tires (only thing not stock) will only get 10-12 MPG around town and short drives but on the highway driving 60 MPH with no wind and no air conditioning it'll run around 16-18 MPG. Jeeps are notorious gas hogs for some reason. Could never understand how a 6 cyl engine could do so bad. At least I do have a '91 Honda Accord that gets 28-30 MPG so the average of the two vehicles isn't quite so hurtful at the pumps.
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Old 02-12-2011, 10:21 PM   #8
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Quote:
Originally Posted by Gorving3

My 2001 Sahara 6cyl auto 3:07 with 31' tires (only thing not stock) will only get 10-12 MPG around town and short drives but on the highway driving 60 MPH with no wind and no air conditioning it'll run around 16-18 MPG. Jeeps are notorious gas hogs for some reason. Could never understand how a 6 cyl engine could do so bad. At least I do have a '91 Honda Accord that gets 28-30 MPG so the average of the two vehicles isn't quite so hurtful at the pumps.
A friend at work claims he's getting 18-20, just today he told me at half tank he put 150 miles so far?? He's stock also?? I think he's full of s**t lol

I've been reading other threads on jeeps running 10-11 in the winter, with drastic increases in the summer months.

I hope this is my case.

I drive a jeep and I don't think I ever pushed over 15mpg, even brand new (mostly city driving).

Not expecting miracles or I'd go after a Prius, but I know I should be doing a little better.

Thank u for the replies : )

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Old 02-12-2011, 11:21 PM   #9
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I just bought an 03 TJ Sport with 30x9.5x15. I've been closely monitoring my fuel mileage. It's got almost 65K on it, so far I've only changed the oil since I bought it (AMSOIL). I'm averaging over 15 MPG. My best tank, mostly highway, was about 17 MPG. When it got really cold (< 0 F) for a while and I didn't adjust my tire pressure and idled a lot it got down to 14 mpg but got better after it warmed back up. Next week I'm going to change T-Case, f/r diff, & Xmission oils, and spark plugs. I'll let you know what all that does for me. Oh yah, I'm usually pretty easy on the throttle. I think altitude can affect fuel economy, I'm at bout 6000'.
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Old 02-13-2011, 01:24 AM   #10
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Quote:
Originally Posted by mum954
I just bought an 03 TJ Sport with 30x9.5x15. I've been closely monitoring my fuel mileage. It's got almost 65K on it, so far I've only changed the oil since I bought it (AMSOIL). I'm averaging over 15 MPG. My best tank, mostly highway, was about 17 MPG. When it got really cold (< 0 F) for a while and I didn't adjust my tire pressure and idled a lot it got down to 14 mpg but got better after it warmed back up. Next week I'm going to change T-Case, f/r diff, & Xmission oils, and spark plugs. I'll let you know what all that does for me. Oh yah, I'm usually pretty easy on the throttle. I think altitude can affect fuel economy, I'm at bout 6000'.
Tire pressure is huge, I run 28-30, Interesting on the fluids, I am do on everything except oil (mobile 1), prob would help a little, less friction on the drive train... Thanks!

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Old 02-13-2011, 05:50 AM   #11
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My mileage drops about 2-3 MPG during the winter months. Your speedo might be off just a little with the 31s. If you have a GPS, compare your total miles travelled with your odometer and do your MPG calculation off the GPS.
Bert
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Old 02-13-2011, 10:02 AM   #12
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Quote:
Originally Posted by 47MTP
My mileage drops about 2-3 MPG during the winter months. Your speedo might be off just a little with the 31s. If you have a GPS, compare your total miles travelled with your odometer and do your MPG calculation off the GPS.
Bert
I did try the gps thing, it's kind of hard to tell, seems to be similar in reading. That's a good amount decrease in the winter. My goal is 14 with the type of driving I do ( mostly city) New plugs are going in today. I just starting to pay attention to stuff, curious to see what plugs I put in, it's been around 10,000 miles so.....

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Old 02-13-2011, 12:48 PM   #13
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Ok my friends.. spark plugs are replaced will see how this goes., I had the Bosch platinum plus in there.

I only had them in for a few months tops and they looked ok, a little carbon buildup around the base on all 6.


I might want to try the water technique or seafoam to clean up the carbon buildup
Dunno?? I'll wait for the warmer weather here,to f****g cold.

Later : p

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Old 02-13-2011, 02:16 PM   #14
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I recently put a can of seafoam in my jeep and I am SOOOO amazed on the increase in MPGs.
I put it in as a "peace of mind" thing just to help keep things clean, and I read its good to drive a bit aggressively to get the best cleaning action.
well after driving very aggressively in my jeep (0-70 launches on back roads and such) I looked at my Odometer....120 miles to a half tank...I normally struggle to get 100 miles driving super easy on it. I cant wait to see what my next tank looks like without all the hard driving I did.
Im going to finish my tank off tomorrow and hope to get 240 miles before I fill up. Before I could only do 190-200 and thats driving very easy. I did not expect this and have continued to drive aggressively the whole tank. I hope my next tank is even better with some old man driving styles.
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Old 02-13-2011, 04:07 PM   #15
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Quote:
Originally Posted by Mr_RPM
I recently put a can of seafoam in my jeep and I am SOOOO amazed on the increase in MPGs.
I put it in as a "peace of mind" thing just to help keep things clean, and I read its good to drive a bit aggressively to get the best cleaning action.
well after driving very aggressively in my jeep (0-70 launches on back roads and such) I looked at my Odometer....120 miles to a half tank...I normally struggle to get 100 miles driving super easy on it. I cant wait to see what my next tank looks like without all the hard driving I did.
Im going to finish my tank off tomorrow and hope to get 240 miles before I fill up. Before I could only do 190-200 and thats driving very easy. I did not expect this and have continued to drive aggressively the whole tank. I hope my next tank is even better with some old man driving styles.
Awesome! Theres different applications of seafoam I believe, what exactly did you use and how much?

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Old 02-13-2011, 04:36 PM   #16
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I'm not one to have jumped onto the fanwagon of Sea Foam. To look at how many miles driven from an indicated 1/2 tank via the notoriously inaccurate gas gauge is not an indication of anything that could be considered accurate.
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Old 02-13-2011, 04:41 PM   #17
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Originally Posted by Jerry Bransford
I'm not one to have jumped onto the fanwagon of Sea Foam. To look at how many miles driven from an indicated 1/2 tank via the notoriously inaccurate gas gauge is not an indication of anything that could be considered accurate.
+1 Very good point, mine is way off.. When my alarm sounds I still have around 10 gallons in my tank.

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Old 02-13-2011, 04:50 PM   #18
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From what I know, seafoam comes in a liquid, a spray, and theres also a transmission product from them. thats all I know of.

I bought a 16oz. can Of the liquid form seafoam (i see it at autozone and walmart so far, walmart was 7.77, auto zone was 9.99).
I used it as a gas additive (can also be used for oil and vacume lines but for Improved MPGs your seeking putting it in the gas would be what you want to do.) the directions say uses 1oz per gallon when using for gasoline. so I filled up and shorty after went to the store to pick it up and dumped in the whole bottle. (I had apx 16 gallons of fuel in tank) After reading the directions I realized I should have got the seafoam first and fueled right after pouring in the seafoam (to help it mix better im guessing), so i did a bunch of quick maneuvers to slosh the gas around in the tank to help it mix (if this was even needed...idk, just making sure) while in the empty parking lot.

so drive till empty, go to station. pour in desired amount of seafoam (whole 16oz bottle for fill up, since our tanks are 17 gallons i believe) for the amount of gas your adding. then fuel up and go. good luck. My jeep is 10 years old and only has 67k miles on it so it probably had its fair share of sitting and short drives, which probably resulted in build up in the injectors and such. Thats my theory of why the seafoam worked so well. If a automobile is ran often, and at speed, with long enough drives to get to max temperature then the seafoam will probably not be as needed and wont be as effective. again just my theory.
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Old 02-13-2011, 05:38 PM   #19
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Quote:
Originally Posted by Mr_RPM
From what I know, seafoam comes in a liquid, a spray, and theres also a transmission product from them. thats all I know of.

I bought a 16oz. can Of the liquid form seafoam (i see it at autozone and walmart so far, walmart was 7.77, auto zone was 9.99).
I used it as a gas additive (can also be used for oil and vacume lines but for Improved MPGs your seeking putting it in the gas would be what you want to do.) the directions say uses 1oz per gallon when using for gasoline. so I filled up and shorty after went to the store to pick it up and dumped in the whole bottle. (I had apx 16 gallons of fuel in tank) After reading the directions I realized I should have got the seafoam first and fueled right after pouring in the seafoam (to help it mix better im guessing), so i did a bunch of quick maneuvers to slosh the gas around in the tank to help it mix (if this was even needed...idk, just making sure) while in the empty parking lot.

so drive till empty, go to station. pour in desired amount of seafoam (whole 16oz bottle for fill up, since our tanks are 17 gallons i believe) for the amount of gas your adding. then fuel up and go. good luck. My jeep is 10 years old and only has 67k miles on it so it probably had its fair share of sitting and short drives, which probably resulted in build up in the injectors and such. Thats my theory of why the seafoam worked so well. If a automobile is ran often, and at speed, with long enough drives to get to max temperature then the seafoam will probably not be as needed and wont be as effective. again just my theory.
I already use mmo in my gas, little smoother idle I believe or it could just be in my head, dunno.

My plugs did have a little build up so like I said, I'm gonna look around and see what people prefer. I like the seafoam idea but might go with the Water, I read it's pretty easy .. 2 people 1 holding the rpms up and me slowly pouring 12-16 oz of good ol' water into the intake. I think that's how it works : )

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Old 02-13-2011, 05:43 PM   #20
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How would water clean anything? I read about it being used to cool down the engine and raises the octane rating by making detonation harder. Seems like its used as a performance technique but If your running that hot and cant just use race gas then something is up.

Or am I missing something to the water practice? It just seems like the last thing I want in my intake. lol
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Old 02-13-2011, 05:53 PM   #21
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If you type in google "water technique, carbon buildup, jeep" I was able to locate some jeep threads on this, as far as I know it works really well on carbon buildup and best off. "it's free"

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Old 02-13-2011, 05:56 PM   #22
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Quote:
Originally Posted by kjeeper10
If you type in google "water technique, carbon buildup, jeep" I was able to locate some jeep threads on this, as far as I know it works really well on carbon buildup and best off. "it's free"

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Actually I found it here and Jerry wrote it, wow : )

http://www.wranglerforum.com/f5/prem...ver-62786.html

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Old 02-13-2011, 06:31 PM   #23
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oh, i see now. very neat, jerry is the man.

Well I don't have any problems like the thread mentioned, and with a combination of the seafoam and my hard driving my MPGs may have been raised. I drive with routine every week and normally fill up in consistent patterns. I will need to fill up tomorrow and Ill give you my verdict on final miles out of the tank and MPGs. My gauge has always been consistent (after being on the road for a while, parking on the slightest angle will mess with my reading) and If its better for me then Im happy.
my last tank was 13.5 MPGs (190 miles and filled up with 14 gallons) so we will see what tomorrows tank says
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Old 02-13-2011, 06:33 PM   #24
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oh, i see now. very neat, jerry is the man.

Well I don't have any problems like the thread mentioned, and with a combination of the seafoam and my hard driving my MPGs may have been raised. I drive with routine every week and normally fill up in consistent patterns. I will need to fill up tomorrow and Ill give you my verdict on final miles out of the tank and MPGs. My gauge has always been consistent (after being on the road for a while, parking on the slightest angle will mess with my reading) and If its better for me then Im happy.
Thank you much!!

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Old 02-13-2011, 08:29 PM   #25
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I've brought this up a few times on hear, if you check your speedo with a GPS you also need to check your odometer. My jeep had 265 75 15's on it when I bought it used. I went back to a 235 75 15. I checked my speedometer and it was dead on up until about 60 mph. It is 2 mph off at 60 mph. However I drove 50 miles with my GPS and my odometer only registered 42 miles. So it will be off by about 40 miles on a tank of gas which will definitely change your mileage if you calculate it by the odometer. So even if you got your speedo close for your tire size the odometer could still be off quite a bit.
The good news for me is I am actually getting better mileage then I thought since my odometer was shorting me miles.
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Old 02-13-2011, 09:18 PM   #26
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I've brought this up a few times on hear, if you check your speedo with a GPS you also need to check your odometer. My jeep had 265 75 15's on it when I bought it used. I went back to a 235 75 15. I checked my speedometer and it was dead on up until about 60 mph. It is 2 mph off at 60 mph. However I drove 50 miles with my GPS and my odometer only registered 42 miles. So it will be off by about 40 miles on a tank of gas which will definitely change your mileage if you calculate it by the odometer. So even if you got your speedo close for your tire size the odometer could still be off quite a bit.
The good news for me is I am actually getting better mileage then I thought since my odometer was shorting me miles.
I just compared to speed, I will check the odometer compared to gps to and from work 2mrw. Thanks!

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Old 02-14-2011, 04:35 PM   #27
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I just compared to speed, I will check the odometer compared to gps to and from work 2mrw. Thanks!

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Alright here I go... Distance traveled to work 20 miles on my jeeps odometer my gps distance showed 22 miles. Pretty much plus a mile every 10. That would be a good 20 to 30 miles added to my jeeps odometer = 2-3 mpg. If I calculated right this is a good thing. Also on the highway i was showing 57 mph and the gps was 63 ish. I read some stuff on the speedo gear, and from what I understand, I did not need to change according to my tire size ( 31's) looks like I do... Or not as long as I know whats going on.

Looks like I am not doing that bad after all!

Still going to run some seafoam, can only help..

Thanks all that replied!!

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Old 02-14-2011, 07:05 PM   #28
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Alright here I go... Distance traveled to work 20 miles on my jeeps odometer my gps distance showed 22 miles. Pretty much plus a mile every 10. That would be a good 20 to 30 miles added to my jeeps odometer = 2-3 mpg. If I calculated right this is a good thing. Also on the highway i was showing 57 mph and the gps was 63 ish. I read some stuff on the speedo gear, and from what I understand, I did not need to change according to my tire size ( 31's) looks like I do... Or not as long as I know whats going on.

Looks like I am not doing that bad after all!

Still going to run some seafoam, can only help..

Thanks all that replied!!

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So you saw an increase of 2-3 MPG? Where does that put you (MPG) total? What kind of plugs did you say you went with? Thanks for the update, it's hard to get honest numbers sometimes. Like the 20 MPG TJ. I'm still waiting for my stuff to get in, pretty excited.
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Old 02-14-2011, 08:15 PM   #29
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So you saw an increase of 2-3 MPG? Where does that put you (MPG) total? What kind of plugs did you say you went with? Thanks for the update, it's hard to get honest numbers sometimes. Like the 20 MPG TJ. I'm still waiting for my stuff to get in, pretty excited.
Ya I see it a lot a ti's that are getting 20mpg

Bulls**t prove it.

I been calculating 9-10 mpg so if i should be showing 2-3 more along with winter gas. 14-15 seems to be the norm. Also based on my driving habits and a lot if idle time ( lunch breaks @ 1/2 hour 6 days a week) that I know is sooooo bad. I should be ok. I'm happy. I might go ahead and replace the speedo gear for piece of mind but don't really think is necessary.

I went with the autolite double p's and wifh that noticed my jeep idles a little smoother.

Felt like spring here in CT almost hit 50 degrees, been way to damn cold. Man I can't wait for spring and summer

Thanks for the help.. Keep me posted

Ken

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Old 02-19-2011, 02:30 PM   #30
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Location: Howell Michigan
Posts: 784
sorry for the delay on the seafoam report.

I decided to do my calculations on the tank of gas after the seafoam because the tank ran with the seafoam was not driven in a normal fashion (I beat on it when using the seafoam)

My last MPGs was explained in a above post at 13.5 MPGs.
well My new calculations was 215.1 Miles (odometer is correct, GPS as a secondary) and refueled with 13.4 gallons. which got me 16.03MPGs. I refuel at the same station and fuel till the pump stops and then try to keep fueling and the pump will immediately stop again, signalling to me its full.
my jeeps details are in my sig
A variables would be temperature (first tank was very cold, this tank we had a few 40 degree days). My driving style between the 2 tanks was the same and My driving locations was the same with a few variations.

even the tank with the seafoam got me 211 miles with 15 gallons of fuel (forgetting exact math but I know my calculation gave me 13.8 MPGs) that tank I was beating on the jeep pretty hard and driving like a punk kid.

so, it seemed to have worked for me, YMMV

=)

__________________
2001 TJ 4.0L Automatic, D35/30, both hard and soft top, full doors,JKS quicker Disconnects, 31" discoverer ATR, American racing 767 offset 15" wheel. ProComp Genuine steel bumpers front and back. glass pack muffler, Rugged Ridge extended fender flares, 130w KC daylighters, motorcycle light for reverse lights. 86,000k miles (11-7-2012)
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