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No. 4 misfires after a new plug and ignition coil

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Could be an injector, power or ground to the injector, and anything mechanical to that cylinder.

Posted on Nov 13, 2010

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Posted on Jan 02, 2017

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2006 grand prix gxp 5.3. When you are driving normally it will miss from 50mph and up. When you punch it it doesn't miss a beat. I cleaned the maf sensor and air filter, Plugs were replaced.


It's probably a coil breaking down , have a scan tool hooked up an have misfires checked to see which cylinder is missing .
Ignition Coils
Each ignition coil has an ignition 1 voltage feed and a ground. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency.
Drive it long enough like that (with it misfiring ) the check engine light will flash . This is to warn that a catalytic converter damaging event is taking place . This would also set a DTC - diagnostic trouble code
DTC Descriptors ?€¢
DTC P0300 Engine Misfire Detected


?€¢
DTC P0301 Cylinder 1 Misfire Detected


?€¢
DTC P0302 Cylinder 2 Misfire Detected


?€¢
DTC P0303 Cylinder 3 Misfire Detected


?€¢
DTC P0304 Cylinder 4 Misfire Detected


?€¢
DTC P0305 Cylinder 5 Misfire Detected


?€¢
DTC P0306 Cylinder 6 Misfire Detected


?€¢
DTC P0307 Cylinder 7 Misfire Detected


?€¢
DTC P0308 Cylinder 8 Misfire Detected

Apr 26, 2016 | Cars & Trucks

1 Answer

Honda odessey engine code p3100


There is no p3100 code!!

I think you copied this wrong. the code is p0301, which is a common one.

The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 1. If the problem persist more tests needs to be done to diagnose problem.

Possible causes
- Faulty spark plug 1
- Clogged or faulty fuel injector 1
- Faulty ignition coil 1
- Fuel injector 1 harness is open or shorted
- Fuel injector 1 circuit poor electrical connection
- Ignition coil 1 harness is open or shorted
- Ignition coil 1 circuit poor electrical connection
- Insufficient cylinder 1 compression
- Incorrect fuel pressure
- Intake air leak

Most likely cause:
Faulty spark plug 1 or Faulty ignition coil 1 (Ignitor coil)

Either are easy fixes. Start with a new spark plug. If the problem continues replace the coil. Pic below. new about $30-$40.





25668053-d0khtfozkoi42lnxngz2bi0n-3-0.jpg

Apr 27, 2015 | 2005 Honda Odyssey

1 Answer

Misfire on Cylinder 3 swapped plugs between 3 and 4 on Pontiak Aztek 2003. Misfire remained on cylinder 3. Swapped ignition coil 3 and 6 with ignition coil 1 and 4 misfire still on cylinder 3


Try a new plug wire on cyl 3 if that doesn't fix it you could have a bad valve or compression problem on cyl 3 Try doing a compression test also If it has injectors for each cylinder you could have a bad injector for cylinder number 3

Dec 04, 2014 | 2001 Pontiac Aztek

1 Answer

Misfiring on cylinder #3


Misfiring can be cause by ignition coil,spark plugs,wires,engine valve,cylinder compression,
if it's a quad four then crack around the ignition coil. there is 2 coils like 1-4 coil and 2-3 coil
first check spark plug color or foul of gaz
hope it help

Oct 18, 2014 | 2002 Pontiac Grand Am SE

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

2 Answers

99 cougar v6 P0352 misfire cylinder 3 and 4 replaced igntn coil..


Had the same problem, car was misfiring on cylinder 3 and 4. replaced wires, plugs, and ignition coil. still misfired on the same cynlinders. turned out the main engine wiring harness plug in was coming loose. spent well over $150 on the unneccesary repairs and ultimately fixed the problem wit a $3 bag of wire ties to hold the plug in...

May 04, 2009 | 1999 Mercury Cougar

1 Answer

98 vw beetle misfiring after rain. New plugs, coil cas cracks????


Hi, Yes it certainly could be especially if water gets in. You should also check the distributor cap. The misfire sounds like an arcing problem so it would have to be one of those two things since you changed the rest. Good Luck!

Feb 25, 2009 | 2001 Volkswagen Beetle

7 Answers

Random Cylinder Misfire


The problem is the ignition control module such is under the coil packs. It seems to be an internal problem in the design. I have seen it many times and if you don't belive as many will not. So disconnect the modules electrical connector and just let it sit for two to three days. After that clean ir replace your sparkplugs, they will be fails up dew to it running lean and rich. Plug it in. Plug it in and wala its fixed $ but only for a week or two then back to the same thing so in short change the ignition module and save time and money, and don't forget to thank your friendly neighbor hood mexican mechanic.

Jul 09, 2008 | 2000 Buick LeSabre

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