Question about 2004 Buick LeSabre

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How do I change the spark plugs on a 2004 Buick Lasabre?

My ignition coils on cylinder 1 and 6 are not firing and I removed and properly replaced the old ignition coils now they are not sparking I was thinking maybe there was a problem with the spark plugs.

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Did you checked the wires?
Make sure you engine is cool! You might need someone to help you on this test since you need to see if any sparks are coming out while you crank your engine.

Inspect the area where the spark plugs are located to see if you need to remove any parts that might be in the way. Take the wires out of the spark plugs using long pliers, like this ones:
http://www.garrettwade.com/images/330/05R0210.jpg

pulling them above the heat shield on the thick area of the rubber. There's a tool to inspect the spark that uses a grounded wire like this one on the link:
http://toolmonger.com/wp-content/uploads/2009/09/modern-spark-plug-tester.jpg
or you can just use a clamp with a wire to ground it, like this one on the link:
http://ww2.justanswer.com/uploads/heavychevy396/2011-05-15_213405_test_plug.jpg

Use a spark plug that you know is working fine, or a new one to do this test. The spark should be blueish in color. If it looks yellow or red, replace your wires (assuming your coil is in good condition). You can also use a screwdriver inserted in the wire connector and get it very close, but NOT TOUCHING a ground source to make a spark. This is a "last resource" method and could result in electric shock, so use it at your own risk. If you have a peacemaker have a professional do this for you to prevent any potential problems.

If the wires are working fine, then inspect the spark plugs. To remove the spark plugs you'll need the spark plug socket and a ratchet to remove them. The spark plug sockets come in 2 sizes and always have a rubber gasket inside to grab the spark plug once is loose.

Posted on Dec 02, 2014

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Posted on Jan 02, 2017

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What is the Wire Order with distributor?


theres no distributor and the firing order for your 3.8 is 1-6-5-4-3-2-the following link shows the coil pack
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Cylinder misfire coil


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My 2004 Kia Rio w/161,000 miles is missing on the #1 and 4 cylinders. I've had the ignition coil, spark plugs, spark plug wires replaced, yet the problem persists. Sometimes, the car runs good for a f


The car computer does the firing of the spark plugs based on info provided to it by various sensors in car. Your mechanic is spot on. Ouch!

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Enging code came up on my 2004 dodge ram 1500 5.7 Hemi. Said ignition coil E was bad and that I had a misfire in cylinder 3. Replaced coil at cylinder 3 but it's still running rough. Is coil E somewhere...


Have you checked the spark plug itself? --- 5.7L Engine To Remove:
NOTE: Note spark plug cable original positions before removing.
dod_ram15_57_ign_coil.gif

dod_ram15_57_ign_coil_loc.gif

  1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
  2. Clean the area around the coil with compressed air.
  3. Remove or disconnect the following:
    • Battery negative cable
    • Throttle body air intake tube and intake box (if necessary)
    • Coil electrical connector by moving slide lock and pressing on release lock
    • Secondary high-voltage cable from coil
    • Mounting bolts
    • Coil from cylinder head opening by twisting
To Install:
  1. Clean area around spark plugs with compressed air.
  2. Apply dielectric grease to inside of boots.
  3. Install or connect the following:
    • Ignition coil to cylinder head opening
    • 2 mounting bolts
      1. Torque to: 106 inch lbs. (12 Nm)
    • Coil electrical connector
    • Cable to coil
    • Throttle body air tube and intake box (if necessary)
    • Battery negative cable
---
Distributorless Ignition System General Information This vehicle uses two different types of ignition systems. The 3.7L, 4.7L, and 5.7L engines do not use a conventional distributor. The 5.9L engine uses a conventional distributor. The ignition system is controlled by the Powertrain Control Module (PCM) on all engines. Procedures in this section are for the 3.7L, 4.7L, and 5.7L engines; please see the section on Distributor Ignition Systems for procedures for the 5.9L engine.
Distributorless ignition systems (EI) are used on many current engines. This system uses the waste spark method for distributing secondary voltage. In a waste spark system, an individual coil is used to fire one pair of engine cylinders simultaneously. These cylinders are known as companions, since each of their pistons is at TDC at the same time. On a typical V6 engine for example, cylinder 1 is at TDC compression while cylinder 4 is at TDC exhaust. This is also true of cylinders 2 and 5 as well as cylinder 3 and 6.
The cylinder on the compression stroke is known as the event cylinder, while the cylinder on the exhaust stroke is called the waste cylinder. Since secondary resistance is very low in the cylinder on the exhaust stroke, little voltage is required to fire the plug. For this reason, the majority of available voltage is consumed by the cylinder on the compression stroke.
One spark plug is attached to each end of the secondary coil winding via the spark plug wires. This series circuit arrangement causes one of the plugs to fire in a forward direction (center electrode to outer electrode), and the other spark plug to fire in a reverse direction (outer electrode to center electrode). The firing voltage requirements on the waste spark ignition are significantly greater than a traditional ignition system primarily because it takes 30% more energy to fire a plug reverse polarity. When a spark plug is fired backwards, it fires from the outer electrode to the center electrode. This is a high resistance path since the electrons do not flow as easily from a cold, dull surface such as the outer electrode to a hot, sharp surface like the center electrode.
Since the coil and plugs are arranged in a series circuit, a typical plug gap of .050" results in a total gap of .100" for the whole circuit that includes two spark plugs for the companion cylinders. The waste spark can overcome this added resistance by producing high secondary output voltages due to low resistance in the primary winding. Another reason higher secondary ignition voltage is required is cylinder pressure; specifically, the lack of it. Generally, event cylinders require 10 to 12-kV to initiate current flow across the spark plug gap, while only 2 - 3-kV is needed to fire the waste cylinder. Therefore, the air gap in the waste cylinder creates no more resistance than the rotor gap does in a conventional ignition system.
There are two different methods used for coil trigger. One method sends the crankshaft sensor signal directly to the ignition module to activate the coils, while the other sends the crankshaft sensor signal to the PCM and the PCM controls ignition operation either directly or through a separate ignition module.
Waste spark ignition advantages
  • It has fewer components than conventional distributor-type ignition systems.
  • No mechanical adjustments to set ignition timing.
  • No mechanical load (turning the distributor shaft).
  • No unwanted timing variations caused by gear lash or other worn distributor components.
Another advantage of waste spark is longer coil life. To illustrate this point, consider a six-cylinder engine with conventional ignition. At 3000 RPM, the coil must fire 9000 times per minute. This is calculated by dividing the engine speed by 2, since the cam turns at half crank speed, and then multiplying the distributor RPM by the total number of engine cylinders.
In contrast, the coils on a six-cylinder engine with waste spark only work a third as hard. This is because there's a coil for every two cylinders and each coil fires every crankshaft revolution. This means that at 3000 RPM, the coils only fire 3000 times per minute. This allows each coil to operate with less dwell (time that the coil is energized), resulting in less heat buildup and longer life.
Coil Over Plug System The coil over plug system was developed so that spark and spark timing could be better controlled on an individual cylinder basis. Each cylinder has an ignition coil mounted directly above the spark plug on the cylinder head cover. A short suppresser/connector replaces the spark plug wire and links the coil to the plug. There are different methods used for primary triggering. Some manufacturers use a combination coil/module, which means each coil has its own control circuit that is activated by the PCM. Others use remote mounted modules to trigger the coils.
Each individual coil is allowed to saturate while all other cylinders fire. For a V-8 engine, this allows a period of seven firing events for coil saturation, compared to three events for the same V-8 engine with a waste spark system. The coil over plug system also benefits from a minimum amount of energy lost, due to the resistance of spark plug wires.
Coil Near Plug System The coil near plug system also features multiple ignition coils. An ignition coil/module is mounted in proximity of each cylinder. There is a short length of spark plug wire between the coil and the spark plug.
Each ignition coil/module has its own control circuit and is activated sequentially by the PCM. All timing decisions are made by the PCM. This includes both ignition timing and duration of the spark.

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1 Answer

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The ignition coil may be what is killing the plug. Since yo have replaced plug and wire and it seemed to do good, the only other option is the coil for that cylinder is defective and causing the plug to foul. This engine if not mistaken has the COP coil over plug on each cylinder.

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1 Answer

Firing Order diagram for 2006 Ford Explorer


Hope this helps. The ignition coil:
  • changes low-voltage pulses from the PCM to high-voltage pulses.
  • fires 2 spark plugs simultaneously.
  • has 3 transformers.
    • One transformer fires the spark plugs for cylinders 1 and 5
    • One transformer fires the spark plugs for cylinders 2 and 6
    • One transformer fires the spark plugs for cylinders 3 and 4
Spark plug wires:
  • carry high-voltage pulses from the ignition coil to the spark plugs.
The spark plugs:
  • change high-voltage pulses to spark at the gap, which ignites the fuel and air mixture.
The firing order is 1-4-2-5-3-6.

69efa96.jpg

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Engine light keeps comeing on mecanic change o2 senser worked for half hour came back on cods keep saying its miss fireing have had this problem for a month know


Start Small work to Big = Saved Money!
The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
The following should isolate the problem(s).
1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.

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1 Answer

Misfire of cylinder 2 & 5 on 04 Buick LaSabre Custom


Ok this may be something smal that may be simple to fixs; your plugs are in the wrong cylinder?

Check Your gap size .060 (In thousandths of an inch)

Im not sure of the size of engine please look below for your make?

82c1f61.jpg

Fig. 3.8L VIN 1 Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system


756ae24.jpg
Fig. 3.8L VIN K Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system


21520e9.jpg
Fig. 3.8L (VIN 1 and L) Engines Firing order: 1-6-5-4-3-2 Distributorless ignition system
321b2dc.jpg
Fig. 3.8L (VIN K) Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system
I hope that this help!

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Daewoo lanos 2000 car is misfiring and wont run properly firing on cylinders 1 and 4 misfiring


have you changed the ignition wires? perhaps firing order crossed? if not coil pack or ignition wires faulty how do you know it is not "FIREING" on 1 & 4 have you tested it with a spark tester tool???

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