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Old 11-15-2011, 01:03 PM   #1
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high fuel consumption

I'm a new owner of the Jeep Wrangler 2.5 1997.Danes year I noticed that the car has a lot of fuel consumption. I drive it to work and this 30km on one page. Traveled 78km in total consumption of 15 liters gasoline. I have a OBD2 diagnostics and we do not show any error. I changed the two lambda probes, plugs, rotor and distributor caps as this is already Previous owners changed and it looks OK. The idling engine revs very slightly volatile. I also feel that car in the bank is losing power too quickly. I wonder also, what is the normal consumption of fuel in these cars.

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Old 11-15-2011, 01:10 PM   #2
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congratz! your getting 12.25 mpg. Is the vehicle stock or has it been lifted? larger tires? stick or auto? while this is low, its not unheard of from these older jeeps, although usually they've been moded before they reach that point.

Check the o2 sensors?

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Old 11-15-2011, 01:17 PM   #3
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ouch! that's pretty bad. Im getting aboug 15mpg from my 4.0L mostly short trips around town, and I thought that was bad.

Oh well, price to pay being attracted to boxy non-aerodynamic vehicles.
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Old 11-15-2011, 01:55 PM   #4
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What are you geared at? I know with mine if I do 75/80 mph I run around 3000 rpm. Then I get crappy crappy gas mileage
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Old 11-15-2011, 01:57 PM   #5
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Thats another question, how fast do you drive on the highway? 65-70 its low, 75-85, its getting better...
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Old 11-15-2011, 02:05 PM   #6
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I dont know metric, but if you want to convert it I'm running a 98 2.5 liter with 31" tires and at 65 miles per hour I average 13.5-14 miles per gallon with a tuned up engine. The one time I ran it for about 200 miles I ran around 75 miles per hour the entire trip and I may have been lucky to get 12 miles per gallon. This is a 98 model 2.5 liter 5 speed with 4:10 gears.
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Old 11-15-2011, 02:10 PM   #7
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Quote:
Originally Posted by arcountryboy
I dont know metric, but if you want to convert it I'm running a 98 2.5 liter with 31" tires and at 65 miles per hour I average 13.5-14 miles per gallon with a tuned up engine. The one time I ran it for about 200 miles I ran around 75 miles per hour the entire trip and I may have been lucky to get 12 miles per gallon. This is a 98 model 2.5 liter 5 speed with 4:10 gears.
I guess your "tuned up" engine is why you get such bad mileage. I have a 3" lift with 32-11.50 aggressive tread tires on my stock 98 2.5L 5spd 4.10 gears and have never gotten under 16 mpg regardless of speed or terrain and have gotten as much as 20 mpg.
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Old 11-15-2011, 02:39 PM   #8
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Originally Posted by kshaws21 View Post
I guess your "tuned up" engine is why you get such bad mileage. I have a 3" lift with 32-11.50 aggressive tread tires on my stock 98 2.5L 5spd 4.10 gears and have never gotten under 16 mpg regardless of speed or terrain and have gotten as much as 20 mpg.

Tuned up as in everything replaced and new. I am a mechanic. I have seen others post saying there were getting 19-20 and then saw some with the same engine, tranny, and gears that were getting like me. I guess it's all in the mileage/jeep...... Same concept I had a 2000 Chevy Z71, buddy had the identical truck same year, tires, drivetrain except mine had 48,000 miles and his had 120,000. I got 6 mpg more than him on a trip to MO running the same speeds.
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Old 11-15-2011, 02:58 PM   #9
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I had the same problem with my 2002 tj. Mine is a S.E 2.5 5 speed 94,000. i went from getting high teens to 11 MPG in the matter of a week. i did all the same stuff tune up and all that none of it fixed it. After about a week or so i finnaly got a code for my E-VAP system dont remember what number or anything. But i had it smoke tested and had a cracked hose some where between the evap canister and the fuel tank. Got that fixed and last long highway trip i got 23mpg. Now thats on a stock SE with no mods and no speed limits over 55.
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Old 11-15-2011, 06:28 PM   #10
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Low 20s? frig! I shoulda' gotten a 4 instead of the 6! Wouldn't have the OPDA to worry about either :P
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Old 11-16-2011, 05:30 AM   #11
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100km/h max up to 2500 rpm. When the lambda probe is defective, the consumption is 12L/100km. After replacing the lambda probe the consumption rose to 20L/100km. Is it possible that the new Lambda probe is faulty, or is it something else?
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Old 11-16-2011, 05:38 AM   #12
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jeeps

Not a fuel mileage vehicle. It's a jeep. Use it as one.
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Old 11-16-2011, 05:55 AM   #13
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I check my gas mileage every time I fill up and in the 3 years I've had my Jeep, I've never been under 16MPG and have gotten 20+ mpg's a few times.

Local city driving is defintiely better for mileage, or at least anything under 55mph. Getting up anywhere near 70mph and I don't know which is moving faster, the speedometer or the gas gauge!!

I have a 5 speed manual trans and 4.0L engine and 31x10.5x15 tires.

Definitely didn't buy the Jeep for fuel mileage though.
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Old 11-16-2011, 06:22 AM   #14
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Quote:
Originally Posted by misko
100km/h max up to 2500 rpm. When the lambda probe is defective, the consumption is 12L/100km. After replacing the lambda probe the consumption rose to 20L/100km. Is it possible that the new Lambda probe is faulty, or is it something else?
As an American Jeep owner, I have never heard of a Lambda probe....what is it?? And 12L/100km is pretty foriegn to me too....sorry I'm just a southern boy.
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Old 11-16-2011, 06:37 AM   #15
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Quote:
Originally Posted by kshaws21

As an American Jeep owner, I have never heard of a Lambda probe....what is it?? And 12L/100km is pretty foriegn to me too....sorry I'm just a southern boy.
o2 sensor.
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Old 11-16-2011, 07:15 AM   #16
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I am still trying to figure out what kind of gas mileage I get. I recently acquired a 97 with 33" tires and it seems to get very poor gas mileage. I haven't been able to run a full tank on it yet with the trip odometer set since I had to disconnect the battery to clear the CEL on an O2 sensor. I am pretty sure I have stock gears as I can't ever seem to see 5th gear....60-65mph on the highway I am at 2300 RPM's in 4th. Of course I also think my speedometer is about 4-5mph short since I don't think any other adjustments were made when the PO lifted it and of course you cannot trust the gas gauge because it drops a quarter of a tank in only about 20 miles and then shows empty when I have 4 gallons left. I have replaced most, if not all, of the parts I have read about related to gas mileage, air filter, upstream O2 sensor, distributor, plugs, rotor, wires, and header.

As one poster mentioned.....It's a jeep, use it like one!
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Old 11-16-2011, 07:28 AM   #17
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its a jeep thing lol

6th gear on the highway, maybe 75ish, 2500 rpms, it sucks the gas down
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Old 11-16-2011, 07:35 AM   #18
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Quote:
Originally Posted by kshaws21 View Post
As an American Jeep owner, I have never heard of a Lambda probe....what is it?? And 12L/100km is pretty foriegn to me too....sorry I'm just a southern boy.
12L/100km = 3.17 gallon / 60 miles, lambda probe = O2 sensor
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Old 11-16-2011, 07:46 AM   #19
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I will on Saturday or Sunday to try to replace a catalytic converter, I know, if something better
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Old 11-16-2011, 08:08 AM   #20
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2000 TJ, 4.0l engine, automatic, fully stock, 30" tires, just under 100k miles. Running 65 highway with the two-piece hardtop closed, I come in about 19.9 mpg. Take the front of the top off, and mileage drops to 16-17.

Haven't tried it with the top completely off yet, but I expect it will be worse.
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Old 11-16-2011, 09:45 AM   #21
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Quote:
Originally Posted by kshaws21 View Post
As an American Jeep owner, I have never heard of a Lambda probe....what is it?? And 12L/100km is pretty foriegn to me too....sorry I'm just a southern boy.
I was talking with someone from Portugal and he said they don't use miles/gal or even km/L (metric). Instead of a distance/fuel usage ratio they use a fuel usage/distance ratio.

So we say how many miles (distance) we went for a specific fuel amount (1 gallon). Example, 15 miles/gallon.

They say how much fuel was used to go a specific distance (100km). Example, 12L/100km.

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