Question about 2002 Jeep Liberty

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02 Liberty 3.7 , recent new heads, new coil packs, plugs . Intermittent rough idle, random misfires and spark advance jumping around at idle from 0-17. I am lost as to what's next to check

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  • Rich Kirby
    Rich Kirby Jul 31, 2013

    Ok, well your only the second person to tell me that.. SO, I ust went out and bought the Crankshaft PS.. Waiting for it to cool down down then I'll change it out. Thanks for the confirmation and I'll let you know it turns out. Its really been driving me crazy. Especially when even the dealer keeps chasing parts.

  • Rich Kirby
    Rich Kirby Jul 31, 2013

    OK, Changed that out this morning, stll having the random misfires and rough idle.. BUT, I found oil leaking from the camshaft position sensor. I am waiting for the shop to open because this should be their issue and not mine. I am hoping that the oil on the sensor is causing this issue. I did find oil on the crank shaft sensor when I changed that out.

  • Rich Kirby
    Rich Kirby Jul 31, 2013

    BTW, I do have the OBDII computer, not a scanner, but the MACtasker system. So, I can see whats going on. No codes are being thrown. I can watch the soark advance swing wide from 0-12 during idle and if I gas it the spark advance runs up to 42...

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  • Jeep Master
  • 15,557 Answers

Crank shaft position sensor

Posted on Jul 31, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

tommyboinow
  • 324 Answers

SOURCE: getting misfire codes for cyl.

it is your fuel injectors, replace them, and the problem will be solved..

Posted on Nov 26, 2008

GARYca
  • 672 Answers

SOURCE: 03 Jeep Liberty random misfire

try checking your ignition coils and also the power wires to them!!Hopefully this helps....

Posted on Jul 15, 2009

BCAS1298
  • 3092 Answers

SOURCE: 2002 Jeep Liberty Sport 3.7L

We have an 02 Liberty 3.7L, here at my repair shop, after customer replaced, spark plug's and all coil pack's, brought it here to my shop, was running with two cylinder's miss, did cylinder compression test, no compression on two cylinder's, remove valve cover's, found two rocker arm's off, remove cylinder head's, and found that on those two cylinder's the valve seat's had drop, keeping the valve open, and that's why the two rocker arm's had come off, do a cylinder compression test, could be the same thing, hope this was very helpful.

Posted on Aug 30, 2010

  • 334 Answers

SOURCE: 92 wrangler 2.5l when warm only; has misfire.rough

Hello albertmiles,

Have you checked for vacuum leaks?

Regards,
netvan

Posted on Feb 21, 2011

ZJLimited
  • 17970 Answers

SOURCE: 2005 jeep liberty engine misfire cylinder 5

A code P0305 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer


If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Posted on Dec 07, 2011

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03jeep lbertyrandom missfire cyl 2 4 6check engine light flashing


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Nov 28, 2015 | Cars & Trucks

2 Answers

Spark plugs misfire and intake vavle is open


I believe you have separate coil packs for each spark plugs, so replace the coil packs on 3 and 4 and all the spark plugs. Not sure about the sticking valve, but knock out first problem, then tackle 2nd problem.

Jan 26, 2014 | 2009 Dodge Journey

1 Answer

2002 Liberty 3.7 Recent new heads, coil packs, plugs. At dealer compression OK , leak down test OK. was running perfectly then random misfires, spark advance jumping from 0-17 at idle.. At speed all is...


you must RUN the scanner/computer for better diagnostic. You can have fuel system malfunction, detonation, valve noise, valve adjustment is set too tight, , intake manifold system is leaking.Engine fuel pump is defective+pcm (ignition system).In short the electronic is complicated now in vehicles.
God bless you

Jul 31, 2013 | 2002 Jeep Liberty

2 Answers

Multiple misfire


Hi Jason:
A Random/Multiple Cylinder Misfire Detected unfortunately doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

A code Random/Multiple Cylinder Misfire Detected may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 26, 2012 | 2001 Pontiac Grand Am SE

2 Answers

My 93 olds cutlass ciera keeps misfiring and stalling, i have change the spark plugs, fuel filter, o2 sensor, maf sensor, and still stalls and misfires any ideas?


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

------------
Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

--------------
Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

----------

This will help.

Thanks.

Feb 14, 2012 | 1993 Oldsmobile Cutlass Ciera

1 Answer

2004 Jetta 1.8T started idling rough at low rpm, OBD says random misfire....


spark plugs? either current ones are bad, or maybe you replaced recently with incorrect ones (most autoparts stores don't have the right plugs for 1.8T...need to go to dealer or ecstuning.com)
-or-
coil packs?
the OBD scan should tell you what cylinder is misfiring. try swapping the coil packs around and see if the misfire moves. if it does, then replace the bad coil pack (might just want to do all 4). if not, trying swapping the plugs around...same idea.

Feb 26, 2011 | 2004 Volkswagen Jetta

2 Answers

My 2003 Pontiac Bonneville has a fault code of p0300 random cylindar misfire. How would you go about fixing it?


A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope helps (remember to rate this).

Oct 11, 2010 | Pontiac Bonneville Cars & Trucks

2 Answers

2002 Jeep Liberty Sport 3.7L V6 Replaced all six spark plugs with brand new ones and replaced coils for 4 and 6 with new ones Still reading misfire Within 10 minutes of starting enging, vehicle idles...


We have an 02 Liberty 3.7L, here at my repair shop, after customer replaced, spark plug's and all coil pack's, brought it here to my shop, was running with two cylinder's miss, did cylinder compression test, no compression on two cylinder's, remove valve cover's, found two rocker arm's off, remove cylinder head's, and found that on those two cylinder's the valve seat's had drop, keeping the valve open, and that's why the two rocker arm's had come off, do a cylinder compression test, could be the same thing, hope this was very helpful.

Aug 30, 2010 | Jeep Liberty Cars & Trucks

1 Answer

04 mazda 3s 2.3l. the emgine misfires randomly but frequently. does have power loss and poor gas mileage. there is no check engine light and had recent sparkplug change with motorcraft platnums and oil...


I have changed plugs using the platinum plugs and the problem don't go away. These plugs can make a car run worse in some cases. I have found it best to use the OEM or a step above on 4 cylin and 6 cylin engines. The Plats work fine in 8 cylin engines. You could also have a bad plug wire. The plug wire could be jumping spark. At night, open the hood, start the car with lights off. Look around the plug wires for sparks jumping. If a wire is bad, the spark is leaving the wire and grounding itself to the nearest metal causing rough engine idle and misfire.

Jun 16, 2010 | 2004 Mazda 3

1 Answer

03 Jeep Liberty random misfire


try checking your ignition coils and also the power wires to them!!Hopefully this helps....

Jul 15, 2009 | 2003 Jeep Liberty

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