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Unread 05-22-2010, 05:41 PM   #1
sracherla
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Help with my Grand Cherokee

Guys,

I recently purchased a used 2001 Grand Cherokee RWD and have a bad problem with it. It throws engine misfire codes 0300 0303 0304. It is my first jeep and it is great but for this one big problem.

I got the de-carb process done and it ran fine for a couple of months. The codes are back again and the mechanic is talking about replacing coils - each at about $400 bucks a pop.

The jeep has 70K miles.

I don't know if I should get this repaired or just get rid of it. Feels like I am throwing good money after bad.

Any thoughts, ideas or suggestions.

- Clueless Jeeper

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Unread 05-22-2010, 05:49 PM   #2
spawnofsatan
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maybe a faulty injector
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Unread 05-22-2010, 05:55 PM   #3
Wheelin98TJ
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Its real easy to rule out a coil pack.

They are all interchangable.

You can swap them out and see if the misfire code follows the coil pack.

The coil packs are $30-40 each from the dealer and are extremely easy to swap out.

I would think about finding a new mechanic.
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Unread 05-22-2010, 07:12 PM   #4
sracherla
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More info...

What is the DIY procedure to replace the coils for the codes 0303/0304. I am guessing these two cylinders fire off of one coil?

Can anyone help me with the part # and the DIY process?

I am googling to find this info as I wait for a reply.

Thanks.
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Unread 05-22-2010, 07:28 PM   #5
ezflip
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I6 or V8?

Either way, get a new mechanic. At $400, he is raping you for at least $300 of that.
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Unread 06-02-2010, 12:39 PM   #6
sracherla
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I6 ---

Is this an easy DIY job?
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Unread 06-02-2010, 12:46 PM   #7
ezflip
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To swap the coils? Yes it is very simple. It is 6 or so 10mm bolts along the pack, then unplug it from the back. The coils on an I6 are all part of one pack that runs across the passenger side of the engine. The PO of my I6 some how broke the pack and hot glued it back together. Wasnt throwing any codes or running rough when I bought it, but about 4 days later it was...I found that. New coil pack was about $80 IIRC.
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Unread 06-02-2010, 01:05 PM   #8
Wheelin98TJ
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When you previously said the mechanic was going to replace coils, that led me to incorrectly assume you had the 4.7 V8.

My prior advice about swapping coils does not apply to the I6. It only applies to the V8.

The coil rail for the I6 is part # 56041476AA and the list price is $242.00. You can get the part for as cheap as around $160 if you qualify for a discount.

I'm not sure if this part is available at the parts stores or not. It might be a dealer only item.
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Unread 06-02-2010, 01:08 PM   #9
ezflip
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I got mine at autozone. They actually had it in stock too.
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2002 Overland - 4.7 HO, "Select-Drive", 4" RC long arms, TAG front winch bumper, 32" BFG KM's, Kolak 3" exhaust, Flowmaster 50 series


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Unread 06-02-2010, 02:32 PM   #10
sracherla
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Thanks, guys. I will get the part and try to swap it out this weekend.
Will let you guys know how it goes....

Update:

I found the part at the local autozone...

Next step: I will try to find a repair manual so that I can get this taken care of...

Last edited by sracherla; 06-02-2010 at 03:22 PM.. Reason: Updated
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