Question about 1996 Jeep Grand Cherokee

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I have a random mis fire code and a mis fire code for all six cylinders what could this be?

I ran out of gas twice the second time my car begain to run horrable. i have all new plugs and wires distributor cap roter button coil pact filter and sending unit. took cat off it was pluged up running straight pipe to my muffler any help?

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Since you have replaced all of the usual tune-up parts, it could be a fuel problem, or something going on with the distributor.
Also could be a vac leak but I doubt that would cause a problem on all 6 cylinders.
I would check fuel pressure next.

Posted on Dec 12, 2012

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SOURCE: Jeep GCL Backfires Stalls

Aaron, I had the same problem. It is the most expensive part of course the computer. I replaced everything as well till I replaced it. They are remanufactured and have had problems with them as well. I am on my third one now at 200k miles. Oh and by the way it does not show up on the diagnostic check. Good luck

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Posted on Dec 01, 2008

stevehinrich
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SOURCE: 1995 Jeep Wrangler 2.5 4cyl spits and sputters while driving

have you considered checking alternator and battery? just a thought

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SOURCE: 1995 JEEP GRAND CHEROKEE RAN AND DIED WILL NOT START

IS IT THE 4.0L?IF SO U MAY HAVE A BAD CRANKSHAFT POSITION SENSOR.

Posted on Apr 28, 2009

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SOURCE: no spark, just put in

I had the same problem with my 85 cj7 this week, I relpaced the ignition control module, plugs, wires, cap, rotor and the the coil; still had no fire to plugs. the problem turned out to be my distributor, replaced it today and she fired right up. Most likely it was the pick up module in the distributor that went bad.

Posted on May 06, 2009

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My 2001 Dodge Statues Coupe RT.has random mis fires. I have replaced bank 1 o2 sensors but it still mis fires as I give it gas to accelerate. Your thoughts? Steve


O2 sensors won't make misfires they only monitor air in the emissions if you have a random misfire it's most likely gonna be your coil pack or a cam pos sensor the cam sensor detects the location of the cam and tell the pcm and it tells the coil to fire your are getting O2 codes cause it detects unburned fuel it the exhaust

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How do I know the numbers for the spark plugs to a 2000 nissan exterra 6 cylinder suv?


the misfire could also be the coil that is what send's the spark to the distributor, if it is weak it will cause a random mis fire code for any cylinder, the plug wire's on my 2000 xterra are numbered it will be the second plug on the driver's side of the engine, the cam sensor will also give a mis fire code if it is malfunctioning, I have a 2000 xterra that is a night mare when it come's to code's and repair's it is not alway's the first thing you think with these vehicle's, try to change all the plug's and dis connect the battery for 20 minutes then hook it back up and run down to your local autozone or pep boy's and have them hook up an OBD to see if it is fixed or if another code appear's

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Have code p300 for 98 gmc jimmy


A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Aug 28, 2014 | Cars & Trucks

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Code p0300 " multiple cylnder mis fire'


Hi there:

DTC P0300 - Random Misfire / Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.



A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.


Symptoms may include:

- the engine may be harder to start
- the engine may stumble / stumble, and/or hesitate
- other symptoms may also be present


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 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.

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Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A misfire diagnostic code P0300 indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a random misfire code doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include the engine may be harder to start, the engine may stumble / stumble, and/or hesitate and other symptoms may also be present.

If you need this or additional details about DTC Fault Codes, feel free to contact us clicking the links.

Hope this helps and have a nice day.

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You still have random misfires (PO300)
You most likely replaced those coils that set a code, and those were not the one bad offender,spiking the computer module.
Take a new coil and put in a cylinder,no change, replace old coil and move new one to next cylinder. You can do that once or twice a day, if you have nothing else to do. You need a 90 degree day, to really get that solved,unless you have an ignition oscilloscope.
Never had a bad spark plug in 45 years.

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