Question about 2004 Jeep Grand Cherokee

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2004 Jeep Grand Cherokee (63,000 mi - V8) Check engine light indicates #1 cylinder misfiring. Spent $$ getting system flushed for carbon residue. Drove 3 weeks, started up, ran rough, and light came on again. Did more indepth $$$ flush, drove 4 highway hours, parked overnight, started up, ran very rough and light came on again. Shop wants to rip the head off etc for $1,200 more. Any ideas?

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  • skilamm Apr 24, 2010

    The technician said all of that was checked and is fine.

  • skilamm Apr 24, 2010

    How big a project is this?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. May 11, 2010

    Nothing was mentioned here about the spark plug,boot,or coil,or fuel injector,has then been checked?

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  • Jeep Master
  • 6,826 Answers

The miss,does not just come and go,if it is a engine valve,replace the coil and boot,go from there,if this does not solve the problem,then the injector is gone out,or going out.If it is a engine valve,the miss would never get better,then worse,it would be the same all the time,get him to run a air compression test,get the valves up(close)and see if any air is detected threw the exhaust,or the intake,it will be present if the valve is the problem.

Posted on Apr 24, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Well remove the coil(there is a screw that holds it)and the boot,and the spark plug.The injector,it is a little more difficult.As far as the cylinder test,a air fitting is put in the cylinder hole(spark plug hole)and air is compressed into the cylinder,getting the valves closed is a little tricky.

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  • 3 Answers

I believe your working with a blown head gasket here. I had a simlar issue with a 2002 jeep grand cherokee kept misfiring and ended up being a blown head gasket should be a simple $400-500 fix i assume

Posted on Apr 24, 2010

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1 Answer

I have a 2003 jeep grand cherokee, It started


wow, no engine option stated, and no DTCs.

4.0L I-6 or 4.7Liters?

WHY DO THAT FIRST. $$$$ parts first.

why not do a tune up first.

you swap in the most expensive parts first? ouch,

The PCM tells you when ckp or cmp fail, with DTC codes

so its not that. but you never posted ALL DTC errors. why not do that.?

do a real tuneup? heat (spark plugs, filters.)

if you have P030x errors,

eg: p0301 is cylinder #1 is misfiring (3 ways to do that not JUST spark)

eg: P0300, random on all cylinders. (fuel mix wrong) or never tuned up.



Misfire 101; (example P0301 DTC)

P030x codes, are all just about spark, misfire is caused by 3 things, (at least)

1: sure spark. weak. (tuneups work as does hV wires sets if no COPS) if 1 cop is bad move it to other location, does failure follow the move>???????? buy new cop boots if engine has cops.

COPS means coil over plug, so v6 has 6, v8 has 8.

coil packs have 3 coils inside for v6 and 4 for V8. called wasted spark to any tech.

2: low compression, think of your v6 (is it) as 6 engines, not 1.

3: wrong FUELING rates. including air leaks to 1 cylinder.

if engine has EGR that too, will cause gross misfiring.

so can an air leak near one intake runner, causing 1 cylinder to misfire.





why not scan it with a real scan tool that can see ALL jeep codes

then post all DTCs found. both idling and driving for 45mph or 1/2hr.

with these facts and what engine is there we can do the remaining tests.

free book



http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service







The tune up is this and filters.

do the tune up, new wires, and plugs using correct spark plugs not some bs, magic ones, use spec, plugs first. its in the manual.

then HV wire set on 4.0L,

if cops V8 , 4.7L try new boots on them. or swap them to find bad one.

the USA car V8 has coil on plugs





misfire means ONLY that this cylinder has weak COMBUSTION

its not weak spark only, that is only 1 cause of poor combustion.



post DTC\'s driving and we can fix it

the best tool is the

Innova 3160 scan tool, that is what I use on home cars.

it does all jeep codes, ALL.

i can drive , and scan and log DTCs.

and gather lots of facts on errors.

that is always the best way,

you can not fix cars today with out owning a scan tool.

unless , luckiest man on earth. (guessing)

Sep 17, 2014 | 2003 Jeep Grand Cherokee

1 Answer

2001 Jeep Grand Cherokee Limited v8 4.7 with 155,000 mi. It recvently began burning oil and blowing white smoke.


Check the water to see it there's oil in it ...and...check the oil to see if it has water in it or if it's higher on the dipstick or not.

Sounds like a blown head gasket or cylinder rings.

Jul 30, 2011 | 2001 Jeep Grand Cherokee

1 Answer

What is firing order


Depend what Engine Model you have:
2001 - 2004 (WG) Grand Cherokee (International Markets)
1999 - 2004 (WJ) Grand Cherokee (All Markets)
WJ engine Specifications
4.0L I-6 1-5-3-6-2-4
4.7L V8 1-8-4-3-6-5-7-2
4.7L V8 HO 1-8-4-3-6-5-7-2

Sep 08, 2010 | 2001 Jeep Grand Cherokee

2 Answers

Jeep 4.0 firing order


1999 Jeep Cherokee 4WD 4.0 liter L6 VIN "S"

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Hope this helps (remember rated this).

Aug 09, 2010 | 1998 Jeep Cherokee

1 Answer

2004 jeep grand cherokee overland 4.7 v8 i got the following engine trouble codes P0301 which cylinder is causing this code?


P0301 is #1 cylinder misfire detected and is most likely related to a worn spark plug that is need of replacement. All plugs should be replaced if replacing one. Not sure how many miles you have on this vehicle, or if plugs were ever installed, but this is the basic step to take in diagnosis.

Jun 02, 2010 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Need firing order for 1998 Jeep Cherokee gand


For the 1998 Jeep Grand Cherokee Laredo:
I do not know if you have the 4.0L In-Line 6-Cylinder, the 5.2L V8, or the 5.9L V8; however I have included ALL 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

For the 5.2L V8: AND 5.9L 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 28, 2010 | 1998 Jeep Grand Cherokee

1 Answer

What is the firing order on the distributor cap on my 1997 Grand Cherokee


For the 1997 Jeep Grand Cherokee:
I do not know if you have the 4.0L In-Line 6-Cylinder or the 5.2L V8, however I have included both 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

For the 5.2L V8: (Side Note 5.9L V8 = Same)
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..(+)-rounded tab screw
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!



Apr 18, 2010 | 1997 Jeep Grand Cherokee

2 Answers

Needs new radiator, can you put a 2000 radiator in a 2004 jeep grand cherokee


I want to say yes compare the sizes and the water inlets and outlets to determine if it does. I am sure it will.

Sep 25, 2009 | 2004 Jeep Grand Cherokee

1 Answer

2000 Jeep Cherokee engine light stays on


HAVE YOU REPLACED THAT PLUG AND PLUG WIRE,FIND NO3 CYLINDER AND PULL THAT WIRE OFF SEE IF ILDE OF ENGINE CHANGES IF NO THEN YOU MAY HAVE BIGGER PROBLEM BUT DEFINITELY CHECK FOR SPARK WITH WIRE ON PLUG ITSELF.

May 07, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Engine Light came on with error code P0306


p0306 is a #6 cylinder misfire trouble code..have seen a faulty injector on 6 cyl model,plug and/or coil on v8 models

Apr 24, 2009 | 1999 Jeep Grand Cherokee

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