Question about 1999 Jeep Cherokee

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1999 jeep grand cherokee keeps missing and smells like gas from the exhaust....have changed spark plugs and wires, boots, ignition coil pack, fuel pump, filter, air charge sensor, map sensor, fan relay............still says running lean and having same problems....help please

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Try changing the O2 sensor before the catalytic converter... mainly if you have seen a change in the gas mileage.

Posted on Oct 17, 2010

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Why is my 1999 jeep grand Cherokee Laredo 6 cylinder still sutton up afterr changing spark plugs and coil pack alone with fuel filter and pump I also changed ignition coil.


sounds like the carb may be at fault. the mixture is incorrect. maybe a stuck choke. try spraying some cleaner down it and running to see if it clears up.

Mar 09, 2015 | Jeep Cars & Trucks

2 Answers

My 1999 jeep grand cherokee skips after changing the coil and spark plug,what could be the problem


get plug wire tester at parts store and test plug and coil wires if there bad change them to also did you check plug gap?

Nov 21, 2014 | 1999 Jeep Grand Cherokee

1 Answer

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

2005 Grand Cherokee 4.7L. When started multiple misfires cyl 1,3,5,7. After running about 1 minute, misfires disappear. Code p0300, sometime accompanied by p0303


P0300 is Multiple Misfire and P0303 is one specific misfire in the cyl #3.

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.

Mar 07, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Cylinder 2 miss fires


A code P0302 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.


Keep us updated.

Feb 07, 2011 | 1999 Mercury Cougar

2 Answers

How to replace spark plugs on 2000 jeep cherokee classic 6 cyl.? Also does 2000 cherokee have inline fuel filter?


TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

Jul 20, 2010 | 2000 Jeep Grand 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

Changing spark plug wires on 2001 Jeep Grand cherokee


yah direct ignition coil pack does away for the need a a distributer cap and rotor.much higher energy ignition system where the computer tell when to fire.if that helps.not hard to change.as long as you change them one at a time so you don't screw up the order.

Nov 27, 2009 | 2001 Jeep Grand Cherokee

1 Answer

Location of the sparkplug wires in a 2000 jeep grand cherokee


If you have the distributorless ignition, you wont have any spark plug wires. This is because the ignition coil packs sit directly on top of the spark plugs. The spark plug boots are connected directly to the ignition coil pack.

If you stand in front of your vehicle open the hood and look to the left side of the motor, just around at the bottom of the valve cover, you'll see a series of three humps. Those are the coil packs and they are held in by four bolts I believe and if you take those out and pry up on the long coil pack, it will come loose from the plugs and then you can change them out.


Jan 03, 2009 | 2000 Jeep Grand Cherokee

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