Question about 1997 Jeep Wrangler

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Jeep wrangler is using too much gas

Use to get 18 mpg now I'm getting apprx. 9 mpg

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I have a 4cyl 97 jeep wrangler. My fuel economy went from 75-80 miles per 1/4 tank to 55-60 miles per 1/4 tank of gas. I traced this to a bad coolant temp sensor (replace twice), and fouled O2 sensors believed caused by my self by placing too much oil on spector air filter (now wipe off excess and let dry in sun), and using carb cleaner and or gas treatment (stopped using). fuel economy went back up to 75-85 miles per 1/4 tank. (also disruption of sensor input/output signals didn't help from battery sliding into computer wiring harness, which I cured by placing a 1" spacer on rear clamp to keep battery away from computer.)

Posted on Jun 20, 2015

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Posted on Jan 02, 2017

shaggyrat
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SOURCE: 99 jeep wrangler

get a 6 cylinder motor drop in this is best gas saver for most vehicles 4 cylinders dont have the ability to push all the weight of a vehicle but runs smoothly
6 cylinders are as i put in words are evenly balanced for everyday use and not gas guzzler either

Posted on May 16, 2008

  • 38 Answers

SOURCE: Jeep Wrangler Gas Consumption and Loss Of Power

If its using a lot more fuel than usual its almost garaunteed an 02 Sensor. Those are located on the Exhaust Manifold's, are about the size of your thumb, and generally have 2, or 3 wires coming from them. If you can, check them for operation before you replace them as sometimes they're kindof expensive.

Posted on May 16, 2008

  • 36 Answers

SOURCE: 1996 Jeep Cherokee Country runs great but mpg went from 18 to 10

check if air filter is clean

Posted on Dec 13, 2008

  • 6982 Answers

SOURCE: 1997 wrangler runs real rich

First thing you need to do is have a code check done (most larger parts stores do this free) For the time being, ignore any O2 sensor codes...Usually that sensor reads rich condition and if too severe it throws a code of it's own but it may be false. Pay attention to temp sensor, manifold temp sensor and other fuel management items. Also, check your fuel pressure regulator...if malfunctioning default is full pressure.

Posted on Apr 09, 2009

  • 6982 Answers

SOURCE: Jeep Cherokee went from 18 MPG tp less Than 8 MPG

There are several items you can check there. Your temperature sender if bad can make the computer think the engine has not reached normal temp, causing the computer to add extra fuel, Your MAP sensor can do much the same thing as can the Throttle position sensor. I'd also check the fuel pressure regulator as default is to a higher pressure than normal.
Manifold air temp and O2 sensors can do that too, but normally not that drastic of a difference.
Testing can be done using a digital multi meter and a haynes or chilton manual as a guide. Begin by having a code scan done (most larger parts stores do that free). Also, make sure the fuel system and lines aren't leaking anywhere...that can use up lots of fuel as well.

Posted on Jul 30, 2010

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Having a wide range mpg from 16 to 20 with same gas and same driving cond.


Doubtful if you will ever get exactly the same mpg as there is always some variation.
Things that can affect it are weather conditions (air density, humidity, temp and even wind). People don't realize that the fuel you buy, even if its from the same exact pump is not always exactly the same. Fuel quality varies with each new delivery as often manufacturers share product right at the terminal where the truck loads. (it works both ways....I once ran a shop with gas out front and at least once a month we were selling "super" from the "regular" pumps because the terminal was short on regular.) This is especially true with smaller companies that don't have their own refineries. You may also be off when filling up by a gallon or so just by changing the direction where you park at the pump as the angle of the tank will change.
You can add injector cleaner to make sure that there are no changes in the injector spray patterns. I use 3oz of acetone per 10 gallons of fuel and it works just fine. Most over the counter cleaners work well too. Also, do the calculations yourself. If you are relying on the ones installed in vehicles, they often aren't very accurate.

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1 Answer

JEEP WRANGLER 2.6 LITER HAS LOST GAS MILEAGE


In an engine of that age, likely you have some compression loss from wear. All other components also are likely a bit out of range and fuel quality today is really questionable (adding methanol definitely kills MPG as it burns cooler and requires 2x the amount to make the same power as does gasoline).
if it happened suddenly, I'd check the sensors and pay special attention to the O2 sensor(s) as they often go out of range and definitely will kill mpg when they do.

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1 Answer

1997 wrangler runs real rich


First thing you need to do is have a code check done (most larger parts stores do this free) For the time being, ignore any O2 sensor codes...Usually that sensor reads rich condition and if too severe it throws a code of it's own but it may be false. Pay attention to temp sensor, manifold temp sensor and other fuel management items. Also, check your fuel pressure regulator...if malfunctioning default is full pressure.

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2 Answers

BAD ON GAS


You should be getting close to 360-390...depending on the type of driving you are doing. Increasing your gas mileage could be as simple as getting a fresh oil and filter job, change your air filter, change your fuel filter...and a biggie believe it or not, make sure you have the proper tire pressure. This will kill your mileage faster than anything else.

City MPG: 16-18 mpg
Combination MPG: 18-21
Highway MPG: Approximately 26 mpg

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99 jeep wrangler


get a 6 cylinder motor drop in this is best gas saver for most vehicles 4 cylinders dont have the ability to push all the weight of a vehicle but runs smoothly
6 cylinders are as i put in words are evenly balanced for everyday use and not gas guzzler either

May 16, 2008 | 1999 Jeep Wrangler

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