Question about 2003 Jeep Liberty

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What is causing my coil packs to burn out and melt repetitively on my jeep liberty 03?

Posted by rod sellers on


2 Answers


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High resistance in the secondary will cause the coils to have to work at there maximum capacity causing coil failure. Use correct wires, spark plugs, gapped correctly also check engine grounds.

Posted on May 17, 2015


Bill Boyd

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For coils to burn or melt indicates excessive current flow through them
have voltage checks done wiring as there may be a problem in the ignition module that is allowing excessive current to the packs

Posted on May 14, 2015


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SOURCE: 2002 Jeep Liberty shuts off

Could be a faulty fuel pump. As the pump warms up, when you have a faulty fuel pump they will tend to seize up. When it fails check the fuel pressure with a fuel pressure gauge and see what it reads.

Posted on Aug 14, 2008

Susan Price

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SOURCE: 03 jeep liberty gas gauge

This is a common problem with all cars, If you do a search on sulfur and fuel gauge problems you would find more info than I can tell you.

But basically you will need to replace the fuel sender in the tank to fix this problem.

The sender uses silver contacts and the sulfur is corrosive to it.

The sulfer in fuel changes thru the year and sometimes its extreme.

Posted on Jan 17, 2010


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SOURCE: what causes to burn out one of the ignition coil of 03 bmw 325i

replace the busted transistor in your ECU. For Bosch 30011 or 30014 you can use BU323Z transistor for replacement. it´s 100% pin-compatible and released for transistor ignition systems.

Posted on Feb 13, 2010


  • 1 Answer

SOURCE: 03 Jeep Liberty Sport sunroof wont close.

03 Jeep Liberty sunroof wont close. I have 4 sunroof buttons; Open, Close, Vent and ASC. Open and Vent buttons are working fine. Close button is not responding. ASC button is flashing red and green but does nothing when pushed. I have no way to get it closed

Posted on Feb 20, 2011


ZJ Limited

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SOURCE: 2005 jeep liberty engine misfire cylinder 5

A code P0305 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Posted on Dec 07, 2011

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1 Answer

Melted coil pack.

which engine? 4L or 4.7L?????
the pack shorted,
buy a new pack,
and pray it didnt burn up the PCM.
ALL high voltage coils fail.
Ignition, induction coils.
by dirt, heat, and the fact there is the giant
E fails (electrostat fields)
all three work hard to kill insulation and plastic potted coil packs.
also bad spark plugs can make this happen faster
as the voltage hits 100,000 volts in a misfire.
the heat and time can crack most plastics.
cracks are sure DOOM thing.

the coil can also burn up if the ecu ignitor transistor shorts. causing gross infinite dwell
that burns up all coil packs .
i always check my ignitor for shorts before
putting in any new expensive coil.
if you dont, you risk burning up the new coil in less than 5 mins.
some swap packs and now you have 2 burned
fun to watch that? not.
what i do is crank engine and measure my ignitor pulse. (with no pack there) if good
a new pack works. if no pulses the ignitor is bad.
(where is your ignitor)? INSIDE THE PCM. this year.

swap it out.
why not just read the free FSm, as posted here over 200 times
2000 WJ jeep it is, and the book , see chapter spark.
and error on this page, see instrument cluster and get igntiion
grin, not my error.? grin
chapter 8i -page 10 (8,eye)

4.0L and 4.7L sorry cant guess engines this life.

the 4L has huge 6 pack coil RAIL that?
athe 4.7L has, uses 8 COP got that?

my wild guess, based on tea leaves and dosing rods.
is V8
page 10 covers it

usually the left side goes bad, carbon tracking
most COP i just buy a new cop boot set for small money.
why not youtube 1000 replacing a COP.
you never posted a photo of the melt,
as when i see real damage it talks to me big time.
if the actual coil section melts, bad news

as you can see, it's just 1 screw at id 2.
and one plug at id 3... super simple, to remove
twist CCW, CW, CCW ,say 2 or three time,
the pull out while TWISTING.. to avoid damage.
the put back with dielectric silicon grease on tip
and where body fits tight to head well bore


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03jeep lbertyrandom missfire cyl 2 4 6check engine light flashing

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1 Answer

2011 jeep liberty spark plug wire diagram

old post
no engine stated
one is 4 term coil pack
other is V6 with 3 coil packs. 3.7L
on my 3.7L it has 6 coil packs but some liberty have 3.

do tell or someone piggy back on this and we can do either
most jeeps have 2 to 4 engine options
so never post lacking engine there. tell it.

Jul 02, 2015 | Jeep Cars & Trucks

1 Answer

What causes missfiers on 2003 jeep liberty 3.7

Bad Plugs, Blocked Fuel Injectors, Bad Coil Pack

Apr 12, 2013 | 2003 Jeep Liberty

1 Answer

2005 Jeep Liberty tail lights & brake lights burn out.

Burnt out socket then you have a bad ground,

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I have a 2003 with 140,000 with the same problem and cannot find a solution. I have to idle the engine high to get the heat to blow hot air as well.

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03 Jeep Liberty random misfire

try checking your ignition coils and also the power wires to them!!Hopefully this helps....

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What do you mean you "went through a car"??? Did you crash???
Generally one speed being "out" is caused by a burned out relay or resistor pack. Check those!!!

Jan 11, 2009 | 2004 Jeep Liberty

1 Answer

Distributor cap

follow sparkplug wires back to distributor cap. all wires will lead either to a distributor cap or a coil pack in the case of a coil pack its a closed system which is non servicable. hope this helps.

Nov 02, 2008 | 2005 Jeep Liberty

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