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No spark at coil wire - 1998 Jeep Cherokee

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Ignition module fault

Posted on Jun 01, 2010

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1 Answer

No spark from coil to distrubuter


Disconnect the ignition coil output wire at the distributor cap.
Connect a spark plug to the end of the ignition coil output wire which you just disconnected.
Connect a ground wire to the threaded portion of the spark plug.
Disconnect the ignition coil ground wire from the negative terminal on the coil (Green Wire).
Connect one end of a ground wire to the ignition coil negative terminal.
Turn the ignition switch to the ON position.
Tap the other end of the ignition coil ground wire jumper on an good grounding point (for example the battery negative terminal) and look for sparks at the spark plug that correspond to the frequency of your tapping of the ground wire.
If you have a good spark at the spark plug, the ignition coil is good.
If you don't get a good spark, check for approximately 12 VDC from the coil positive terminal (black wire) to ground with the ignition switch in the ON position. You should also get approximately 12 VDC from the coil negative terminal (Green wire) to ground
Ignition Coil Resistance Check

In addition to the test above, you may elect to perform an ignition coil resistance check as confirmation of the coil's condition.

Check the ignition coil primary coil resistance by connecting an ohmmeter between the positive (Black wire) and negative (Green wire) terminals on the coil. The resistance should be 0.4 to 0.6 ohms.
Check the ignition coil secondary coil resistance by connecting an ohmmeter between the coil output terminal and the ignition coil negative terminal. The resistance should be 5000 to 7200 ohms.

You may have a bad coil or bad ground or wire connection

Jan 23, 2017 | Cars & Trucks

1 Answer

2004 chrysler van 3.8 motor replaced coil pack still doesnt fire number 4 cylinder


If the coil pack has a four wire connector, one wire is primary voltage, the other three wires are ground, one ground for each coil, one coil fires two spark plugs. If problem with coil or ground, you would lose spark for two spark plugs. Did you visually check for spark, everywhere? What about the spark plug wire or the spark plug, itself?

Oct 18, 2016 | 2004 Chrysler Town & Country

2 Answers

Jeep 3.7 cylenders 2 & 4 not firing


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.

Mar 29, 2014 | 2006 Jeep Liberty

1 Answer

Describe your how fix my pontiac 2000 montana Problem changing spark plugs



Inspection

Inspect for the correct routing of the spark plug wires. Improper routing may cause cross-firing. Inspect each wire for any signs of cranks or splits in the wire. Inspect each plug wire boot for tearing, piercing, arcing, carbon tracking or a corroded terminal.
If there is any corrosion, carbon tracking or arcing indicated on a plug wire boot or terminal, both the plug wire and component it was connected to should be replaced.


Removal & Installation

3.5L Engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Remove the left side spark plug wires from the spark plugs.
  3. Remove the left side plug wires from the retaining clips.
  4. Rotate the engine for access as follows:
    1. Set the parking brake.
    2. Shift the transaxle into neutral.
    3. Remove the engine mount strut bolts. Swing the engine mount struts aside.
    4. Install the Engine Tilt Strap J-41131.
    5. Pull on the engine in order to rotate the engine forward.
    6. Tighten the strap.

  5. Remove the right side spark plug wires from the spark plugs.
  6. Remove the plug wires from the retaining clip.
  7. Remove the spark wires from the ignition coils.
  8. Remove the plug wire assembly from the engine.
    NOTE If you are replacing the spark plug wires, the spark plug wire conduit and retaining clips should be transferred to the replacement wires.

To install:
  1. Install the right side plug wires to the ignition coils and then the spark plugs.
  2. Install the spark plug wires to the retaining clip.
  3. Rotate the engine back to the original position.
  4. Install the left side spark plug wires to the ignition coils and then to the spark plugs.
  5. Install the spark plug wires to the retaining clips.

3.9L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Remove the intake manifold cover.
  3. Remove the left side spark plug wires as follows:
    1. Disconnect the left side spark plug wires from the spark plugs.
    2. Disconnect the left side spark plug wires from the ignition coil.
    3. Remove the left side spark plug wire clips from the intake manifold and heater inlet and outlet pipe.
    4. Remove the left side spark plug wire assembly.

  4. If removing the right side spark plug wires, the engine must be rotated for access as follows:
    1. Set the parking brake.
    2. Shift the transaxle into neutral.
    3. Remove the engine mount strut bolts. Swing the engine mount struts aside.
    4. Install the Engine Tilt Strap J-41131.
    5. Pull on the engine in order to rotate the engine forward.
    6. Tighten the strap.

  5. After rotating the engine, remove the right side spark plug wires as follows:
    1. Disconnect the right side spark plug wires from the spark plugs and ignition coil.

  6. Remove the right side spark plug wire clip from the ignition coil bracket.
  7. Remove the right side spark plug wire assembly.

To install:
  1. Install the spark plug wire assembly.
  2. Install the right side spark plug wire clip at the ignition coil bracket.
  3. Connect the plug wires to the ignition coil and spark plugs.
  4. If the engine was rotated for access, return the engine to the original position.
  5. The remainder of the installation is the reverse order of removal.

Feb 05, 2011 | 2000 Pontiac Montana

2 Answers

How do I replace the ignition coil in my 2002 ford taurus



Removal & Installation

3.0L (VIN S) Engine

  1. Disconnect the negative battery cable.
  2. Unplug the engine control sensor wiring connectors from the ignition coil and the radio ignition interference capacitor.
  3. Tag and disconnect the spark plug wires from the coil by squeezing the locking tabs, then twist the tab and pull upwards.
  4. Unfasten the four ignition coil retainers and remove the coil and the coil ground wire the radio ignition interference capacitor. Save the capacitor and coil ground wire for re-installation of the coil assembly.
  5. Wipe the coil towers with a clean cloth dampened with soap and water. Remove any soap film and dry with compressed air. Inspect the coil for cracks, carbon tracking, dirt or damage and replace as necessary.

    0996b43f802333d8.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Ignition coil assembly mounting-3.0L DOHC engines


To install:
  1. Place the coil, capacitor and the coil ground wire onto its mounting location on the right hand valve cover.
  2. Install the coil assembly retainers and tighten to 45-61 inch lbs. (5-7 Nm)..
  3. Apply dielectric compound D7AZ-19A331-A or its equivalent to the spark plug wire boots.
  4. Attach the spark plug wires to their proper terminals on the coil and make sure the boots are firmly seated so that the locking tabs engage.
  5. Attach the engine control wiring connectors to the ignition coil and the radio ignition interference capacitor.
  6. Connect the negative battery cable, start the vehicle and check for proper operation.

Dec 19, 2010 | 2002 Ford Taurus

1 Answer

There is a misfire in my engine, changed plugs & wires. now it reads that the fuel leveling sensor is bad, will this help?


If there is a misfire, the cylinder that it is misfiring in will be recorded as a code in the computer.

Have the car scanned to determine which cylinder is bad. Then, replace the coil pack going to that cylinder.

Ignition Coil Pack Removal & Installation 2V Engine To Remove:
  1. Twist the spark plug wires off of the ignition coil towers. Mark the spark plug wire positions so they can be installed in their original positions.
  2. Disconnect the electrical connector from the ignition coil. CAUTION
    When removing the spark plug wires, a slight twisting motion will break the seal and ease removal.
    coilconn.gif

  3. Remove the mounting screws and remove the ignition coil.
To Install:
  1. Position the ignition coil pack on engine.
  2. Install mounting screws and torque to 53 in-lbs. (6 Nm). coilbolt.gif

  3. Connect ignition coil pack electrical connector.
  4. Match previously marked spark plug wires to ignition coil and install.
4V Engine To Remove:
  1. Remove the RH cowl grille cowlpic.gif
  2. Remove the screws and the water shield
  3. Mark spark plug wire positions
  4. Disconnect the spark plug wires from the ignition coil CAUTION
    When removing the spark plug wires a slight twisting motion will break the seal and ease removal.
  5. Disconnect the ignition coil electrical connector coilconn.gif

  6. Remove the mounting screws and remove the ignition coil
To Install:
  1. Position ignition coil pack. Install mounting screws and torque to 56 in-lbs. (6Nm)
    coilbolt.gif

  2. Connect ignition coil pack electrical connector
  3. Match previously marked spark plug wires to ignition coil and install
  4. Position water shield and install screws
  5. Install RH cowl panel
prev.gif next.gif

Aug 11, 2010 | 2002 Ford Taurus

1 Answer

How to replace 1997 buick inition coil


I just did one the other day. There are three coils. You can determine which one is bad by using the number one spark plug wire and an old spark plug. Put the spark plug in the wire ( while it is still in the coil) and ground the plug against the engine block. Make sure it is grounded solidly to metal or you could get a nasty shock. Have someone start the engine. Look at the spark. It should be fat and blue. Turn the engine off as soon as you have seen the quality of the spark. Pull one of the wires from each coil in sequence and move the number one wire to that coil. Proceed as above. The weak coil(s) will have intermittent spark, yellow spark or maybe none at all. Once you know which coil(s) are bad remove the two small screws at the ends of the coil. They hold the coil down. Pick the coil straight up, pulling the contacts out of the ignition module. Set the new coil in place and screw it down. Both towers spark every time the coil fires so reinstall the wires in either spot on a given coil. Good Luck

Apr 27, 2010 | 1997 Buick Park Avenue

1 Answer

Change coil, sparkplugs, spark plug wires, icm and still no spark. take off spark plug wire put a good spark plug on it and ground it no spark with everything new.


Coil is bad
inspect for cracks
u could check for spark at the coil wire going into the distributer(center wire )

Sep 24, 2009 | 1992 Honda Accord

1 Answer

Not getting spark


Testing the coil packs.

1. Get an INSULATED wire and hook it to a ground on the car.
2. Get some one to help you
3. pull a spark plug wire off the coil
4. hold grounded wire close to, but not touching, the part where the spark plug wire connects
5. keep hands away from coil and have your helper turn the engine over ( start car and turn off)
6. if there was a spark between the wire and the coil pack it is good. if not, the coil pack needs replaced
7. replace the spark plug wire
8. test the rest

Apr 22, 2009 | 2003 Mitsubishi Galant

1 Answer

Do not know where spark plugs are located in motor


the spark plugs wires are directly located on top of the engine and the spark plugs are down inside the holes in the valve cover itself. I believe there are also 2 coils on top of the engine, which hide two of the spark plug wires which are attached directly to the underside of each coil, remove the coil pull it upward carefully and you will find the spark plugs for those two in the hole underneath the coil for each one. If you decide to replace the plugs, make sure to check the spark plug gap even if they tell you they are pre-gapped as pre-gapped spark plugs are usually gapped for more than one particular car and it may be incorrectly gapped for your specific vehicle. If you decide to also replace the spark plug wires, you will have to purchase the spark plug wires for the underside of each coil seperately because most local auto parts stores only sell 2 spark plug wires in the set that go onto the non-coil attached wires and plugs, and you have to purchase the coil spark plug wires seperately. So all in all you should have 4 spark plug wires, 2 that attach directly underneath the 2 coils, then 2 regular type wires that run to the other spark plugs. If you look at the valve cover and see the wires, you will see what i am saying better. Just don't forget to ask the autoparts store the spark plug gap recommended for you car, and adjust the gap on the plugs as needed. good luck.
Bren H.

Sep 19, 2008 | 2000 Mitsubishi Mirage

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