Question about 2005 Dodge Neon

2 Answers

P0456 and p0301

Cylinder one spark plug went out... replaced all four with wires: runs rough and is misfiring, engine bogs down when accelerating... help

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  • Dodge Master
  • 3,640 Answers

P0456 is--

  • A small leak in any of the EVAP hoses or fuel tank hoses
  • A small leak in the purge valve or vent valve
  • The EVAP Canister may be leaking also check the gas cap! remove the cap and replace it tight. then see if the check engine code goes out. because there could be a leak in cap check this first! .as for p0301 it is number one cylinder misfire, please go to this site it will explain it in better detail, repairpal.com/OBD-II-code-po301. good-day !

Posted on Feb 11, 2012

  • yadayada
    yadayada Feb 12, 2012

    This doesn't explain the misfire code

  • carl Feb 13, 2012

    SORRY! I forgot to mention po301, there are a few things that could be wrong. Faulty spark plug or wire
    Faulty coil (pack)
    Faulty fuel injector or wiring, check the coil and wiring and plugs on number one cylinder. run some good injection cleaner in tank. if injector pattern is way off it will cause a misfire also. good-luck!

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  • Dodge Master
  • 74,945 Answers

The 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


Article Source: http://EzineArticles.com/1982987

Posted on Feb 11, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Bat1956
  • 585 Answers

SOURCE: cylinder 1 misfire

If it smooths out at wide open throttle it's probably not the injector but rather a substantial vacuum leak at that cylinder.

Posted on May 06, 2009

Mustgo
  • 2359 Answers

SOURCE: MIL indicates cylinder misfire on 1, 3, and 5

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

  • 14585 Answers

SOURCE: auto question,I have an 96 Dodge Ram w/ 5.2L V8

I would check the injector. Pull the plug and check for corrosion. Use on ohm meter to check the injector. The resistance should be 11 to 15 ohms. Check it against another injector. they should be close. You can also check the injector plug. best to use is a noid light, but you can use the meter. set it to dc volts to check. the numbers should jump everytime it fires. since you got a 300 and 301 misfire it tells me that you have an intermitant misfire in cylinder 1. The other sensors are still good don't replace them. The coil is still good, because when it starts to go, it will have misfires on all cylinders or will not work at all. The crank sensor is the one that detects the misfire, again don't replace it because it's not bad, it's just doing it's job. If the injector and harness check out good then I would start check the cylinder for compression and mechanical problems

Posted on Nov 24, 2010

  • 3640 Answers

SOURCE: 2005 3.8 dodge grand caravan

did you check the coil it may be bad. for # 1 cylinder. if you can, just replace them all. then you will know everything is ok! but change #1 coil first to find out. try putting some injector cleaner in the tank, or swapping the injector from the #1 cylinder to the #2 and see if the code follows it and let us know.

Posted on Aug 26, 2011

yegarboy
  • 286 Answers

SOURCE: Misfire problems on my 2006 Dodge Stratus SXT 2.4l DOHC

Thats exactly what it sounds like.

Posted on Dec 13, 2011

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P0301-

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Engine runtime 3 seconds, engine speed change under 1200 rpm, and the PCM detected a misfire condition present in one cylinder during the 200 (Catalyst) or 1000 revolution (Emission) test range.Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

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CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M


P0301 - Cylinder 1 Misfire Detected.

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

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- Perform Injector Service
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- Replaced Injector #1
- Replaced Ignition Coil #1

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Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
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Solutions:
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