Coil pack misfire number six

Hi,

Since it is related to cylinder 6, reconfirm that the coil connector is tight and clean and that the connector isn't damaged. Also, check wiring to it.

If that is good, it could be an issue related to the fuel injector or even engine compression. However, compression usually isn't good for a while and then fail again. I would try switching the injector between cylinder 6 and another cylinder to see if the misfire changes cylinders.

Now, do you have a live data scanner? If you do, can you provide me with the short term fuel trims?

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Now, here are the directions for replacing a fuel injector. The attached pics correlate with the directions.

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2005 Dodge or Ram Truck Grand Caravan V6-3.3L VIN R
Procedures
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Injector Service and Repair Procedures
PROCEDURES
REMOVAL
1. Disconnect the negative battery cable.
2. Remove the Intake Manifold.
3. Disconnect injector wiring connector from injector.

Fuel Injector And Rail Typical

Pic 1

4. Position fuel rail assembly so that the fuel injectors are easily accessible.
5. Rotate injector and pull injector out of fuel rail. The clip will stay on the injector.
6. Check injector O-ring for damage. If O-ring is damaged, it must be replaced. If injector is reused, a protective cap must be installed on the injector tip to prevent damage. Replace the injector clip if it is damaged.
7. Repeat for remaining injectors.

INSTALLATION
1. Before installing an injector the rubber O-ring must be lubricated with a drop of clean engine oil to aid in installation.
2. Install injector clip by sliding open end into the top slot of the injector. The edge of the receiver cup will slide into the side slots of clip.
3. Install injector top end into fuel rail receiver cap. Be careful not to damage O-ring during installation.
4. Repeat steps for remaining injectors.
5. Install fuel rail, refer to Fuel Rail in the Fuel Delivery section.
6. Connect fuel injector wiring.
7. Install the Intake Manifold.
8. Connect the negative battery cable.

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Let me know.

Joe

Hi,

Is there any ticking coming from the engine near cylinder 6? Also, don't worry about the injector. They aren't expensive.

Joe

Hi,

It's hard to tell if that will fix it. It could be a wire, but you switched them and it didn't change which cylinder was misfiring. Try the coil, but honestly, I have a feeling it is something different. There could be an injector issue or it could even be related to compression. It has a lot of miles. Here is what I suggest. If you are going to replace all the plugs, this is the perfect time to check engine compression. You need to remove the plugs to check it. Here is a link showing how it is done in general. You will need a compression gauge, but if you don't have one, most parts stores will lend you one. Take a look through these links:

https://www.2carpros.com/articles/symptoms-of-low-compression

https://www.2carpros.com/articles/symptoms-of-low-compression

https://www.2carpros.com/articles/how-to-test-engine-compression

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Here are the directions specific to your vehicle:

2005 Dodge or Ram Truck Grand Caravan V6-3.3L VIN R
Cylinder Compression Pressure Test
Vehicle Engine, Cooling and Exhaust Engine Testing and Inspection Symptom Related Diagnostic Procedures Non-Trouble Code Procedures Cylinder Compression Pressure Test
CYLINDER COMPRESSION PRESSURE TEST
CYLINDER COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions.

Ensure the battery is completely charged and the engine starter motor is in good operating condition. Otherwise the indicated compression pressures may not be valid for diagnosis purposes.

1. Check engine oil level and add oil if necessary.
2. Drive the vehicle until engine reaches normal operating temperature. Select a route free from traffic and other forms of congestion, observe all traffic laws, and accelerate through the gears several times briskly.
3. Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnormal firing indicators fouled, hot, oily, etc. Record cylinder number of spark plug for future reference.
4. Remove the Auto Shutdown (ASD) relay from the PDC.
5. Be sure throttle blade is fully open during the compression check.
6. Insert compression gauge adaptor Special Tool 8116 or the equivalent, into the # 1 spark plug hole in cylinder head. Connect the 0-500 psi (Blue) pressure transducer (Special Tool CH7059) with cable adaptors to the DRBIII.
7. Crank engine until maximum pressure is reached on gauge. Record this pressure as # 1 cylinder pressure.
8. Repeat the previous step for all remaining cylinders.
9. Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder to cylinder.
10. If one or more cylinders have abnormally low compression pressures, repeat the compression test.
11. If the same cylinder or cylinders repeat an abnormally low reading on the second compression test, it could indicate the existence of a problem in the cylinder in question. The recommended compression pressures are to be used only as a guide to diagnosing engine problems. An engine should not be disassembled to determine the cause of low compression unless some malfunction is present.

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Let me know what you find.

Joe