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P030 code on a 1997 jeep Cherokee. I have replaced the spark plugs and wires. The distributor cap and rotor. Changed out catalytic converter too. Code still pops up. Any Ideas out there?

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  • Jeep Master
  • 786 Answers

You need a Chilton or Haynes manual for a list of the codes.

Posted on May 16, 2017

  • 5 more comments 
  • Joe Stanton May 16, 2017

    Autozone can give you a print out and delete the stored codes Then any pop ups will be current. The code you posted could be a year old

  • Jeff Armer May 17, 2017

    The code you posted could be a year old , How do you figure that ????? If the problem isn't current after three key cycles the computer clear's it it's self .

  • Jeff Armer May 17, 2017

    Here read thishttp://www.brakeandfrontend.com/diagnosi...

    has misfire codes , rough running , an broken valve springs

  • Joe Stanton May 17, 2017

    sorry, it has to be done manually with a CRT

  • Joe Stanton May 17, 2017

    You can use the off key on key method if you want too. I like The Snap-On 3000 method myself

  • Joe Stanton May 17, 2017

    I went to the website One in a million springs do fail.

  • Joe Stanton May 17, 2017

    How about that .090 spark plug gap, wow

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  • Jeep Master
  • 11,762 Answers

P030 ???? You mean P0300 random miss fire ? Vacuum leak ? Intake manifold gaskets !

Posted on May 16, 2017

Testimonial: "I guess it could be that code but the P030 is the one they all give me. Autozone and random other places."

  • 4 more comments 
  • Mark Sims
    Mark Sims May 16, 2017

    I found this here P0300 Multiple Cylinder Mis-fire on this site so I think you are correct.https://www.quadratec.com/jeep_knowledge...
    The last time I went to auto zone they saved it was the valve springs?

  • Jeff Armer May 16, 2017

    There is away to check codes on chrysler , dodge an jeep vehicles without going to autozone ! Turn the key on , off , on , off then on an leave it on and look in the Odometer !https://www.youtube.com/watch?v=m5s6zPkZ...

  • Jeff Armer May 16, 2017

    Weak valve springs ? I would have it check by a qualified repair shop before having any work done . It is possibly , weak or broke valve springs .

  • Mark Sims
    Mark Sims May 17, 2017

    Ok will do. Thank you for your help!

  • Joe Stanton May 17, 2017

    Mark, That code has nothing to do with valve springs. Jeep valve springs are good for over 300,000 miles. I have never seen one fail. Save your money. The print out from Autozone should have translated that code. The Chilton manual is a cheap reference. You wont have to throw money at what people tell you.

  • Jeff Armer May 17, 2017

    You must not do a lot of vehicle repair , chrysler has cheap valve spring's , have seen a bunch of broken one's cause lean misfires. An chilton manuals are junk . Pay for a identfix or motologic subscription , Around $20 buck's an it's just like factory service repair info . Show's thing's a chilton manual will never have .
    So mind your own business . Stop tell people stuff you have no clue about . I work for a chrysler dealer , have for twenty years . Chrysler engines are junk !

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1 Answer

Code p0304 misfire e 320 mercdes 1997 when you start car vibrates and when you are at stop sign. solution please


A code P0304 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 symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs/wires). 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 equipped). Otherwise, check the coil packs. Sometimes the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your catalytic converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Oct 21, 2013 | 1997 Mercury Grand Marquis

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No coil spark 6 cylinder? 97 4wd jeep grand cherokee


Hi there:

Are you trying to change coil position? This could mean that one or more of the following has happened:
- Faulty spark plug or wire
- Faulty coil (pack)
- Faulty fuel injector

- 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, have a nice day

Jun 24, 2012 | 1997 Jeep Grand Cherokee

1 Answer

Piston 3 and 6 are misfiring the jeep shakes and doesnt accelerate well


Code P0303 and P0306...

A code P0303 and P0306 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

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.


Hope helps.

May 03, 2011 | 2002 Jeep Grand Cherokee

1 Answer

Stalls and backfires 1997 jeep grand cherokee limited replaced the map sensor, coil rotor. distributer, spark plugs, spark plugs wires. throttle body pressure sensor ,ingnition coil IAT sensor. amd still...


you need to check the fuel pressure,and did you mean you replaced the distributor or just the rotor because inside the distributor is a pickup plate that some times causes this also 02 sensor can cause this.is your check engine light on if so go to chain auto parts store they usually read your codes for free.

Nov 26, 2010 | 1997 Jeep Grand Cherokee

1 Answer

Po303 code. I put new spark plugs in but still have misfire code.


A code P0303 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

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.

Hope helps (remember to rate this answer).

Nov 03, 2010 | 2001 Jeep Cherokee

1 Answer

My jeep will not start, why?


didint it start after yo replaced the parts or before.

Jul 16, 2010 | 1997 Jeep Cherokee

1 Answer

What would cause a cylinder 5 misfire in my 2002 jeep grand cherokee 4.7L


A misfire 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 you notice 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.

Mar 24, 2010 | 2002 Jeep Grand Cherokee

1 Answer

1995 jeep grand cherokee with 4.0 engine back fires through air fliter box when driving and the vehicle loses power.


Possibilities can include:

Clogged catalytic converter - needs replacement or removal.

engine timing off - adjust the camshaft position sensor.

distributor cap & rotor - replace along with new spark plugs and wires

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Vehicle is stalling and back firing


P0108 is MAP sensor
P0351 is ignition coil A cicuit malfunction

Mar 03, 2009 | 1997 Jeep Grand Cherokee

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