Question about 2003 Jeep Grand Cherokee

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WILL THE IGNITION COIL STRIP OR PACK CAUSE A 2003 GRAND CHEROKEE 4.0 NOT TO START AFTER THE ENGINE GET WARM.I CAN GO TO THE VEHICLE AND START IT ABOUT TWO HOURS LATER. I WILL LEAVE IT RUNNING ABOUT TEN MINUTES AND IT WILL GO DEAD

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Hi!!

When a faulty coil gets hot, it quits working, you have a 3 pack and they hardly ever go out in packs, usually one at the time and it will be misfiring and loss of power before the engine dies and the check engine light will come on. If check engine light is on, have the codes scanned to find out which coil is defective.

Otherwise, I would go for the ignition module, it is the flat part in wich the coils sit on. Check connector and wiring.

Check for spark in all 3 colis when no start condition occurrs, if no spark in nither one, replace ignition module.

Don't forget to rate this post!! Good Luck!!

Posted on Jul 12, 2010

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Having same problem. Its not the coil. We are losing power to the cool between the asd relay and coil when engine gets hot. Any ideas?

Posted on Oct 22, 2011

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2003 pontiac won't start after warming up.,but will crank ,not the stater any ideas?


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My 2002 jeep grand cherokee will not start


if not just a fuse the best thing to do is hook it up to a scanner.There are a number of things it could be...coil pack,ignition switch,relays ect... Process of elimination can get very expensive.you can rent a scanner from autozone for around $100 that you get back when u return it so it is free and will tell you what the problem is for sure.

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Dec 22, 2011 | 2003 Pontiac Grand Am

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My jeep will stall when I start it up then once it warms up it will go away. After the truck is driven a while the shaking and stalling continues. What can it be? I have replace the spark plugs 3 weeks...


You will need a multipoint check on the engine.
start with the fuel, fuel filter, fuel pump, fuel injectors and the fuel lines. Fuel problems are heat dependant and wil show up in cold or warm condition. check calibration of pump.
Now check the ignition circuit of the engine. start with the plugs- now being new- check the HT wires, the HT coils, the triggers to the coils- the ignition system.
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Jun 17, 2011 | 2003 Jeep Grand Cherokee

1 Answer

Ok I have 2002 Jeep Grand Cherokee, I have replaced the spark plugs and the coil rail but still getting the code P0351 and I was wondering if this could be caused by some kind of sensor?


The code indicates the coil pack or spark plug is malfunctioning. You can test this using an additional person. by removing the coil pack and spark plug, place the spark plug into the coil pack and ground the tang on the spark plug to the engine. Have someone start the engine and watch for a blue spark. if there is no spark, then the coil pack is malfunctioning. There is also ways to check the coil packs using a multimeter.

also, bee sure you didnt crack the ceramic part of the plug during initial installation.

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1 Answer

88 grand am


If you have a volt/ohm meter, you may want to first ohm check the resistance between the two spark plug towers on each ignition coil pack. Simply remove the spark plug wires from each coil pack and test. Both (if good) should test about the same resistance, (about 5-7 kOhms, but I don't have the exact specs handy on this particular vehicle. The reading may be higher, maybe around 7-12kOhms) but nonetheless, the reading of the 1-4 coil pack should closely match the 2-3 coil pack. If not, the new coil pack may be faulty and should be returned for a replacement.

Also, when you remove the 1-4 coil pack, take a look at the primary spade connectors (2 lugs) coming out of the ignition module. Make certain these are clean and free of rust or corrosion. If so, simply (and gently) use a finger nail file or 400 (or equivilent) sandpaper to file the corrosion off and re-attach the coil pack.

If one or both of these don't fix the problem, you may have to look at replacing the ignition module. But only do that after exhausting the other simpler and less expensive tests! :)

I hope these tips help you out or at least point you in the right direction! :)

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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

2 Answers

2000 jeep cherokee sport 4.0


I believe that year had distributorless ignition, instead it uses a form of coil on plug ignition system.

If you open the hood, stand at the front of the vehicle. Look to the left side of the engine, around the bottom of the valve cover (The valve cover is where the oil fill cap is. The oil fill cap is on top of the valve cover), at the bottom of the valve cover on the left side you will see a series of humps. Those series of humps is the coil packs, the coil packs are all in one long piece held down by three or four bolts.

Take out those bolts, gently pry up at the ends of the coil pack and it will eventually come out. You'll see on the bottom side the spark plug boots are attached to the coil pack. After you get the ignition coil pack off, you will see the spark plugs under where the coil pack came from, the boots on the coil pack sit directly on the spark plugs.

Jan 01, 2009 | 2000 Jeep Grand Cherokee

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