1990 Dodge Dynasty not firing on #6 cylinder at all. Plug, wire and coil testing good. Suggestions as to next step please?

Here is the firing order and spark plug wire routing diagram for a 2006 Chevy Impala LT 3.9 V6:
Firing order: 1-2-3-4-5-6
Spark plug wire routing (starting from the driver's side):

• Cylinder 1: connect to the coil tower closest to the driver's side headlight
• Cylinder 3: connect to the coil tower next to cylinder 1
• Cylinder 5: connect to the coil tower next to cylinder 3
• Cylinder 2: connect to the coil tower closest to the passenger side headlight
• Cylinder 4: connect to the coil tower next to cylinder 2
• Cylinder 6: connect to the coil tower next to cylinder 4

Note: Make sure to route the wires properly to avoid cross-firing.

Not to be simplistic, but I had a situation where a coil was suspected of being problem, and it turned out to be spark plug, so if you haven't already, swap a plug with one that is firing is good step to take next.

Hello, check the compression on all cylinders, check the injector on #6 cylinder and let me know.
Thanks.

The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persist more tests needs to be done. PO307 is the same thing except number 7 cylinder. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation

first do a cylinder compression test on engine to verify good engine compression this should be around 110psi to 175 psi check for vacuum leak, intake port for #6 cylindermay be leaking air, or also check coil for that cylinder, if wire and spark plug have already been changed, last replace fuel injector for that cylinder.

It is worth checking if you are having an ignition problem. First check whether you have spark. Remove one of the spark plug wires and look to see if it is sparking when you turn the starter. Check the distributor wiring and harness. Check the distributor rotor. Also you should check the ignition coil.

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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.

dude, i think you have two spark plug cables cross over. go to your local autozone and find a "firing order" if it was a blown head gasket it would show on the compression test but i'm pretty sure its a spark plug cable cross over.

No spark, ck the crank position sensor. bolted on engine at the front crank pully. Good luck. unplug and plug it back in to clean the wire connection/

Could you clarify your engine size?

4 Cylinders K 2.5L TBI SOHC 6 Cylinders 3 3.0L FI (found in 36% of 1990 Dodge Dynasty) 6 Cylinders R 3.3L FI (found in 64% of 1990 Dodge Dynasty)


If you have the 3.3L the voltage regulators are located in the Powertrain Control Module (PCM) or Single Board Engine Controller (SBEC), depending on the model. If, after diagnosis, the regulator is deemed faulty, the PCM/SBEC must be replaced with a new one.

Hope this helps for now