Question about 2003 Dodge Neon

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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?

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Yeah it could a defective computer. or it could be the catalytic converter, a bad oxygen sensor, or a burned exhaust valve. oxygen sensors can be really screwy though. ive had 2 cars get check engine lights because of the oxygen sensor. so i would definitely check that. if you already have though i would be leaning towards a faulty computer.

Posted on Jan 07, 2011

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Oct 29, 2015 | 1995 Dodge Neon

1 Answer

It has a misfire ,we changed the plugs and the coil pack and wires still has a misfire what else could it be


Gas or compression. Check the injector circuit on 1 and 3. Are they pulsing, to put gas in the cylinders? Do a compression test to rule out loss of compression as cause for the misfire.
Kind of odd it would be 1 and 3, but that is one right after the other in the firing order of 1-3-4-2...so, you have a single coil? So you have a distributor-examine closely the distributor cap and rotor if those were not changed too, with the plugs and wires. Look for damage, little black tracks that indicate shorting of the spark, maybe damage at the electrode tips on the inside of cap on 1 and 3 plug wire towers. Most people change the cap and rotor when doing the plugs and plug wires.
Just a possibility also, that the injector ground wires for 1 and 3 might share the same ground. That is to say, they might splice together before going to the computer where the computer internally grounds injector circuits to cause pulsing. Well, those are my thoughts, good luck. And let me know what you find, always interested.

Dec 13, 2013 | 1998 Dodge Neon

1 Answer

I have a 2008 dodge avenger se and my engine light is on and was flashing before. when it is in drive or park it turns off when i stop. i took it to auto zone and the told me that cylinder 3 and 4 misfire...


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.

Sep 18, 2017 | 2008 Dodge Avenger

1 Answer

My 1998 plymouth neon has a number 4 cylinder misfire. changed plugs, wires, coil pack. still misfires. does it at slow speeds and really bad when trying to get up to speed when entering the highway....


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.

Apr 12, 2011 | 1998 Dodge Neon

1 Answer

I just purchased an 2003 neon se its idling rough and in gear at a stop. As well as sometimes it hesitates and no acceleration. we've changes the motor mount, new spark plugs and wires, 02 censors and have...


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.

Feb 05, 2011 | 2003 Dodge Neon

1 Answer

2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


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.

Jan 17, 2011 | Hyundai Sonata Cars & Trucks

1 Answer

PO301 code on Hyundai Sonata. Replaced wires, plugs, coil packs, and mass air flow sensor.


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

Jan 17, 2011 | Hyundai Motor 2003 Sonata

1 Answer

Hi i have dodge neon 2004 the problem is apear check engie on and receive code p003 . tugging the car at any speed, i already replace spark plug but after 2 week start whit the same problem,


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

Dec 18, 2010 | 2003 Dodge Neon

2 Answers

Have a misfire on cylinder 3


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

Jul 14, 2010 | 1998 Dodge Durango

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