I have a 2003 dodge neon sxt auto that has a misfire in the second cylinder and changed spark plugs,coil,wire,and fuel injectors. did a compression test and checked the ohms just about everywhere but still misfires. can it b the computer?

If you're still experiencing a cylinder 2 misfire in your 2013 Dodge Avenger 3.6L V6 after replacing the coils, spark plugs, and wires, there are a few potential causes to consider: 1. Fuel Injector Issue: A malfunctioning or clogged fuel injector can cause a misfire in a specific cylinder. Check the fuel injector for cylinder 2 and ensure it is functioning properly. It may require cleaning or replacement. 2. Compression Problem: Low compression in cylinder 2 can lead to a misfire. Perform a compression test to check the compression levels in all cylinders. If cylinder 2 shows significantly lower compression, it may indicate issues with the valves, piston rings, or cylinder head gasket. 3. Ignition Timing: Incorrect ignition timing can cause misfires. Ensure the ignition timing is set correctly according to the manufacturer's specifications. 4. Vacuum Leak: A vacuum leak near cylinder 2 can disrupt the air-fuel mixture and lead to a misfire. Inspect the vacuum lines and intake manifold for any leaks or loose connections. 5.Engine Control Module (ECM) Issue: A faulty ECM can incorrectly trigger a misfire code. Consider having the ECM scanned for any error codes or anomalies related to cylinder 2.

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BAD COMPRESSION CHECK COMPRESSION ON ALL CYLINDERS

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

The P0304 code means that the cylinder 4 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 4.

CHECK FUEL INJECTOR WIRING TO NUMBER 4 INJECTOR,HOOK A TEST LIGHT TO MAKE SURE IT BLINKS WHILE ENGINE RUNNING.THAT WAY YOU WILL KNOW IF PCM FIRING THE FUEL INJECTOR OR FAULT AT THE INJECTOR WIRING OR YOU HAVE INTAKE LEAK LOW COMPRESSION TO THAT CYLINDER BECAUSE OF BAD BURNED OUT VALVE.COMPRESSION TEST TO THAT CYLINDER CAN ALSO HELP.LOOK FOR LOOSE OR WORN DAMAGE ROCKER ARMS IF YOU HAVE A SOHC SINGLE OVER HEAD CAM ENGINE.

I would recommend a compression test on all cylinders, compression should be near 150 psi. What you want to look for is one or more cylinders with compression that is slightly lower than the rest. I have seen literally dozens of these vehicles with burnt valves causing misfire codes to set. If no problem is found with the compression test, test the spark output from the coil.

P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

P0301 - Cylinder 1 Misfire Detected.


Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder


Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0300 Random/Multiple Cylinder Misfire Detected this is the code your refering to what it means is it means your haveing a misfire in your fireing system it dosent mean that it has to be a plug could be a plug wire or a coil pack on the plug is causeing this or a faulty fuel injector replace your plug wires if it goes off if not test your injectors its in one of theses good luck

Hello
Here is what to check let me know if you need help checking this out
most common misfire causes on the cars I've worked on have been:

1. Spark plugs
2. Spark plug wires
3. Ignition coil
4. Fuel injector
5. Wiring to fuel injector
6. Timing Belt
7. Vacuum leak or stuck open EGR
8. Contaminated fuel or bad fuel pump
9. Weak compression
10. Blown head gasket