Question about 2001 Jeep Grand Cherokee

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I have been logging my gas mileage on my Jeep Grand Cherokee for the last 9 years. My jeep has a Straight 6 cylinder motor, that has given me about 17mpg city and 23 mpg highway. This last summer my jeep started getting poor gas mileage, 10 city and 15 highway. I looked at my logbook and the bad gas mileage jumps out at you. My auto mechanic can't figure it out. The jeep has 219.000, and has never missed an oil change or any schedule maintenance. The on board computer says there is nothing wrong. What could it be?

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I would start by pulling a spark plug and looking at condition. With that kind of mileage, has it ever had a valve job? Valve's burn and valve springs get weak, could have a carbon problem. Also compare the brands of fuel you're using, many have changed their formulas - I've noticed it with my own cars. Also have your mechanic do a compression test.

Posted on Mar 13, 2011

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2 Answers

Fireing order diagram


cylinder firing order is: is 1-5-3-6-2-4 .... In Jeep Grand Cherokee Laredo ...Happy motoring.

Sep 04, 2014 | 1996 Jeep Grand Cherokee

1 Answer

Is a 1995 jeep grand cherokee limited v8 vs. inline 6 transmission interchangeable?


No sir they will not interchange. i worked at a transmission shop for 7 years. the inline 6 has a 500 trans in it and the v8 has a 518 trans in it. the bellhousings are different.

Jan 03, 2014 | 1995 Jeep Grand Cherokee

1 Answer

I need to know the firing order of my 1995 limited jeep grand cherokeemy spark plug wires are missing i have new wires i just don't know the firing order


For the 1995 Jeep Grand Cherokee:
I do not know if you have the 4.0L In-Line (Straight) 6-Cylinder or the 5.2L V8; however I have included bothe below.

For the 4.0L In-Line 6-Cylinder:
Firing Order:
1-5-3-6-2-4
Cylinders:
(back)
|..6..|
|..5..|
|..4..|
|..3..|
|..2..|
|..1..|
(front)
Distributor:
...(back)
....5...3.(+)-screw
1...........6
(+)4...2
...(front)

For the 5.2L V8:
Firing Order:
1-8-4-3-6-5-7-2
Cylinders:
.......(back)......
|..8..|........|..7..|
|..6..|........|..5..|
|..4..|........|..3..|
|..2..|........|..1..|
.......(front)
Distributor:
.......(back)
.........3
...4.........6
8...............5
...1.........7
.........2
.......(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

May 21, 2010 | 1995 Jeep Grand Cherokee

1 Answer

I need the firing order for a 1994 Jeep Grand Cherokee Straight 6 engine


For 1994 Jeep Grand Cherokee:
2WD and 4WD have the same
4.0L In-Line 6-Cylinder:
Firing Order:

1-5-3-6-2-4
Cylinders:
(back)
...6
...5
...4
...3
...2
...1
(front)

Distributor:
....(back)
.....5....3..(+)-screw
1.............6
(+).4....2

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

May 20, 2010 | 1994 Jeep Grand Cherokee

1 Answer

P0302 fault code. which one is cylinder 2 in 03 jeep grand cherokee


assuming you have the straight in-line 6 then the cylinder numbers are 1-6 from front to back

if you have a different engine let us know ASAP

Apr 02, 2010 | 2003 Jeep Grand Cherokee

1 Answer

1999 Jeep Grand Cherokee overheated


You probably messed up a rod or caused piston damage your going to need more than a head gasket usauly when you over heat a car you causing the pistonts to expand more then they need to causing scouring and exsisive piston ware by the sound of it and the year your better off replacing the whole motor or completely rebuilding the old one wich will cost more then a use motor! good luck!

Sep 12, 2009 | 1999 Jeep Grand Cherokee

2 Answers

Fuel guage fluctuaging and low gas light dinging in 1997 Jeep


the sending unit is more then likely a mess, take it back to where you bought it and demand they fix the problem

Dec 29, 2008 | 1997 Jeep Cherokee Country

1 Answer

Gas consumption


My Answer:

Poor gas mileage can be a result of many many things.

First of all you need to find out what is the factory normal gas mileage for your model year Jeep SUV. It should have said on your window sticker if you bought it brand new. If you are a 2nd or 3rd owner then a Jeep dealer would have info. Google search will tell you as well, and only takes a couple minutes to find.

I did a quick Google search and for a 2003 Jeep Grand Cherokee with a (4.7L V8 engine) the average mileage is roughly 14 mpg.

Not sure what engine you have as to options, etc?

How you drive will greatly change that number up or down depending on a number of driving and driver variables.

A few being -

Driving habits?

Tire pressures?

Engine tuned up?

Lube & oil/filter changes (every 5,000-7,500 miles? Air filter changes (every 10,000-15,000 miles)? Read your auto manual for exact recommended intervals.

How many people in the SUV on average?

Are you towing anything?

Type gas you are burning - BRAND? (See injectors below)

Area you are driving in (hills and valleys verses flat out,
etc)

Jeeps in general don't have a good track record for great mileage, and rough engine idling is always a clue that your fuel injectors are dirty. Typical on all Jeeps with port fuel injection systems! On Jeeps with dirty fuel injectors your mileage will go way down accordingly. If your not putting at least a 12 oz bottle of say Walmart brand Super Tech Fuel Injector Cleaner (~ $1 each) in your gas tank religiously every logged 1000 miles, or every 2 tank fill ups, then you are just inviting dirty fuel injectors and POOR fuel economy!

My 1993 Ford XPLR with a 4L V-6 engine (and ~ 160,000 flawless driven miles) gets roughly 22 miles per gallon on the highway with cruise control on, and about 17 around town on average. I religiously put a 12 oz bottle of the above injector cleaner in my gas tank every 1000 miles!! Of course I do all my own tune-ups, general repairs, and suspension maintenance (shocks, O2 sensors, trans oil changes, lube & oil/filter changes, code reading and clearing, etc) myself and it shows! I don't trust repair shops except for say Tires and Balancing at SEARS.

Hope that helps ease your mind about gas mileage as it relates to your Jeep there.

Frank


Aug 01, 2008 | 2003 Jeep Grand Cherokee

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