Question about 2006 Jeep Liberty

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Jeep 3.7 cylenders 2 & 4 not firing

Overheated removed coils on cyls 2, 4, 6, to run gasket repair process, no leaking coolant, but the 2 & 4 cyl has no spark

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1. harness
2. coil
3. ECU

But before try 1,2 and 3..
You can check your spark plugs and coils from others (1,3,5,6) at 2,4.

If the spark plugs and coils work on 1,2,5,6 but 2,4 with change trying..
You have to check the 1,2 and 3.
(I hope you understand with my poor English explain)

Posted on Mar 31, 2014

  • 11 more comments 
  • _-__-___-_
    _-__-___-_ Mar 31, 2014

    if the others are good, then its this, (wasted spark requires a path to 2 spark plugs, or both fail) so its not just 3 things, its this, (dead sparkplug(open) open HV wire to either spark plug, then your 3 (coil,wires,connectors,ECU driver dead) see? in wasted spark the HV side must have a good loop path to 2 coils. (study how wasted spark coils work)

  • _-__-___-_
    _-__-___-_ Mar 31, 2014

    take 2 new spark plugs, ground them and wire them to the coil with 2 new HV wires. WORK now? good, i saved you lots of money on Coil or ECU, huh>?

  • _-__-___-_
    _-__-___-_ Mar 31, 2014

    wasted spark IS a loop. 1 coil feeds 2 spark plugs in a series, LOOP.

  • jin kim
    jin kim Mar 31, 2014

    Fossil I said.. :"But before try 1,2 and 3.. You can check your 'spark plugs' and coils from others (1,3,5,6) at 2,4. If the spark plugs and coils work on 1,2,5,6 but 2,4 with change trying.."

  • jin kim
    jin kim Mar 31, 2014


  • jin kim
    jin kim Mar 31, 2014

    That means if 2,4 spark plugs work at 1,3,5 and 6, you don't have to buy spark plug. Then I save your money. huh?

  • _-__-___-_
    _-__-___-_ Mar 31, 2014

    you can waste time with old plugs,time is money.. I have fresh spark plugs (test) at all times. what if the plug was fouled, causing you to spend 100 on coil or $500 on ECU. what then? never do tests with unknow tools or old spark plugs. or look like dog chasing tail.. silly.

  • jin kim
    jin kim Mar 31, 2014

    I didn'

  • jin kim
    jin kim Mar 31, 2014

    I changed ECU with $169 with this car. Anytime tell me. You right ECU problem is very unusual. But Spark plug, coil, harness and then you can check ECU.

  • jin kim
    jin kim Mar 31, 2014

    You are better say, before check ECU. Some sensors. But your attitude is totally wrong. I just got e-mail question and just answer it. What's that much problem? Anyway when you need $169 ECU tell me.

  • James Daly
    James Daly Apr 02, 2014

    Fellas, no reason to argue, tried all that already, all new plugs, tested cyl 1, it fired moved to 2, no sparkie sparkie, checked wires, good, so only one thing left ECU for 159. In tomorrow and we shall see! Concerned that I ran the motor with the coils unplugged, possibly screwed something up. Even disconnected both cables from battery, and discharged the system, left unhooked over night, and NG.

  • jin kim
    jin kim Apr 02, 2014

    James. What about harness? I just complain with Fossil's attitude, but ECU problem is very very unusual. I took off ECU and opened and saw some problem. But you don't have to open ECU, before you sure. If you want to open ECU, needed careful. Do not bent it. I wonder how did you test the harness. Can you tell me?

  • jin kim
    jin kim Apr 02, 2014

    And one more.. Never do Engine clean with water spray for this car.


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  • Jeep Master
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3.7 V6, mileage?

most likely the HV wires bad.

then bad coil pack.

did you check spark directly at the coil pack?

i use 2 known good HV wires to do that and 2 good test spark plugs.

both plugs grounded to engine (shell)

that is how you test any wasted spark coil pack. 3 coil pack.

if that fails the FSM shows, unplugging it and check the coil resistances. if wrong the pack is bad,

keep in mind the res. can read ok and coil be bad ,due to internal insulation break down (internal shorts)

if thats ok. the resistance , make sure the wires are not (primary)

to the coil (the low voltage connnector)

if that is ok, its mostly likely a bad coil, (pray not bad PCM)

if tool-less? start with cheap parts , work to expensive. (guessing)

now wasted spark 101.

if one line opens , both spark plugs die. no spark

the wasted spark is wired in SERIES. ( like Christmas lights)

the magic cuts cost of 6 coil\'s.

so if the HV wires are say, cheap , carbon wire and open

you lose, both spark plugs. use MAG wire and end this issues.

get some nice NGK mag wire or Bosch Mag wires.

you can see i hate carbon wire. for good causes.

(carbon string wire)

mag wires is real wire that is coil spun and is inductive. it

has the correct impedance but is not a resistor its and inductor.

and lasts the longest , and worth every penny.

Posted on Mar 30, 2014


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