Question about 2002 Jeep Liberty

2 Answers

My engine is misfiring

I have changed spark plugs, ignition coils, and fuel filter. The fuel filter was filthy. after all this, the problem went away temporairly

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  • Randy Aikman Jul 19, 2010

    i have a 2002 jeep liberty limited. 3.7. the engine is misfiring
    I have changed spark plugs, ignition coils, and fuel filter. The fuel filter was filthy. after all this, the problem went away temporairly

  • Randy Aikman Jul 20, 2010

    I tried the solutions that were provided. as I suspected, the new ignition coils that I purchased were the problem

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  • Jeep Master
  • 2,050 Answers

I would again check the fuel filter, you might have some stuff in your tank, and this can also affect injectors. Hopefully it hasn't damaged the fuel pump. Start with the filter and see how it is.

Posted on Jul 19, 2010

  • 1 more comment 
  • Randy Aikman Jul 19, 2010

    the problem appears to be with the ignition coils that I purchased. Out of six, three of them failed eithin a few days. Any ideas?

  • Randy Aikman Jul 20, 2010

    the problem appears to be with the ignition coils that I purchased. Out of six, three of them failed eithin a few days. Any ideas?

  • Douglas Hansen
    Douglas Hansen Jul 20, 2010

    You need to be sure that the spark is missing and on what cylinders. Then if you think you have an issue with the new coil packs, swap them around to see if the condition follows. Then you will know if they are the problem, or your computer is missing a cam or crank input.

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  • Master
  • 3,917 Answers

Hi

Please check the link bellow to diagnose your problem when engine misfires …
Please go through the article to have a detailed idea regarding your query...

http://kick-fix.com/misfiring.html

http://www.aa1car.com/library/misfire.htm

Let us know if you have something more to know else accept the suggestion.
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Posted on Jul 18, 2010

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1 Answer

How do I fix cod po301


Hello Carlos,
It is a common problem with '99 Cady (Random Misfire Detected)
  • Start the car and carefully pull the plugs boot out one by one, and put it right back (a few seconds is enough).
  • Take Notice of of which one is affecting the RPM of the engine ( slowing down and and shaking erratically).
  • With the engine Off.
  • Use the appropriate socket and again one by one take out the spark plugs and check them for oil and heavy residue build up.
  • If there is Oil in anyone of plugs, take the car to mechanic and let him or her do an evaluation or diagnostic.
  • You probably need new coil packs and spark plugs.
  • Change the oil and the air filter too, if they are dirty.
  • Check also the fuel filter.
  • If the code does not go away by itself, have it reset by a mechanic.
Best of Luck,
JP

Jun 28, 2015 | 1999 Cadillac Catera

3 Answers

My 1996 Taurus when I press the gas pedal when cold it sputters and lacks power. When it warms up it runs great.


Possible causes - Faulty spark plug 5
- Clogged or faulty fuel injector 5
- Faulty ignition coil 5
- Fuel injector 5 harness is open or shorted
- Fuel injector 5 circuit poor electrical connection
- Ignition coil 5 harness is open or shorted
- Ignition coil 5 circuit poor electrical connection
- Insufficient cylinder 5 compression
- Incorrect fuel pressure
- Intake air leak

The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes



When is the code detected? Engine Cylinder 5 is Misfiring.


When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.



Oct 21, 2014 | 1996 Ford Taurus

1 Answer

Misfire & black soot on ignition coil


Blinking check engine light means major misfire on one or more cylinders. You may get spark on a test but under load it may be getting blown out ..id replace the coils and bring in your spark gap 4000th of what its set.also an extremely clogged cat can cause backfires too.also it wouldnt hurt to pull your injectors and clean them and check the injection seals and the fuel filter low fuel pressure or junky injection can cause this too.

Jun 09, 2013 | Honda Accord Cars & Trucks

1 Answer

Misfiring.


need do a tune up change spark plugs and wires.clean fuel injectors and change fuel filter.if engine equiped with distributor replace distributor cap and rotor.if vechicle still misses.could have bad ignition coil or cylinders have low compression.

Jan 13, 2013 | 1994 Toyota Corolla

1 Answer

Engine light came on and said 8th cylinder misfire i changed spark plugs and ignition coil but still showing same problem


Could be a clogged fuel injector. Check all ignition connections to make sure they are clean and secure as well as the one for the associated fuel injector.

Jun 11, 2012 | 2003 Ford Crown Victoria

2 Answers

Random misfire 1997 bmw 528i


remove and clean the injectors
misfires are more injector problems than wires and plugs

Oct 13, 2017 | 1997 BMW 5 Series

1 Answer

My '01 impala 3.4 v-6 flat spots when COLD, at around 20mph. the idle is ruff with random misfires. acceleration is overall poor. when HOT, most symptoms go away leaving only some slight acceleration...


depending on mileage, but possible tune-up could fix it. if already done then check ignition coil pack and ignition wires also spark plugs, check vacuum hoses for leaks or porous, last injectors clogged - use some techron fuel injector cleaner (wal-mart has them). Also get the throttle body and iac valve cleaned by throttle cleaner . Also this other possibilities are to be checked and confirmed.:---- Engine running rough or misfiring can be cause by the following:

1.Defective spark plugs
2.Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4.False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

--------- This should help.Keep updated.Thanks.Helpmech.

Mar 27, 2011 | 2001 Chevrolet Impala

3 Answers

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

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

P0303 - Cylinder 3 Misfire Detected.
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
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

3 Answers

I have a 2003 Escape XLT that is misfiring with a code of p0316 and p 0306. What do i need to check or repair?


P0306 is cylinder 6 misfire..P0316 is misfire in the first 1000 revolutions. A proper tune up will probably take care of the code. This includes spark plugs. I have the Mercury Mariner equivelent engine and you will need to remove the upper intake plenum to replace the plugs. It is plastic so take extra care when removing and re installing. I did not have to use new gaskets. There is a "coil pack" on each spark plug so no wires to change. I would change the air and fuel filter also.

Jan 05, 2011 | Ford Escape Cars & Trucks

1 Answer

1996 Honda Accord Rough Idle Even After tune up performed Changed spark plugs, distributor cap and rotor wheel along with all spark plug wires, changed fuel filter, air filter, spent $150 on fuel injector...


Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

Mar 02, 2010 | 1996 Honda Accord

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