2000 Jeep Grand Cherokee spark plug replacement
はじめに
手順 1 に進むThis is a great vehicle. Even so it is a high mileage SUV (235,000 miles), junior still uses it as a daily driver. The interval for changing the spark plugs is listed as every 30,000 miles. It is a relatively straight forward task and does only require basic metric hand tools. The spark plugs used for this model are Autolite XP985, pre-gapped at 0.89 mm (.035 in.).
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The 4.0L 6–cylinder engine uses a one-piece coil rail containing three independent coils. Located on the right hand side (passenger side) of the engine.
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The one-piece coil bolts directly to the cylinder head with 4 13mm hex bolt (M8X50). 3 of the bolts are immediately visible.
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The fourth one is somewhat hidden in the back, under the coolant lines for the heater. The hoses can easily be moved out of the way.
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With all 4 bolts removed, the rail should easily pull off the spark plugs. One electrical connector (located at the rear end of the coil rail) is used for all three coils. It is not necessary to totally remove the rail for a spark plug change.
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Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs.
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Use a 5/8inch spark plug socket and extension to remove the spark plug. Again, the ignition rail can be easily moved out of the way.
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To reassemble your device, follow these instructions in reverse order. Always use a spark plug socket that has a rubber insert to hold the spark plug into the socket. Use the socket and a extension without a ratchet to hand tighten the spark plugs. Ensure that they can be easily screwed into the spark plug hole. There is always a risk of cross threading when using the ratchet. Position ignition coil rubber boots to all spark plugs. Push down on coil assembly until bolt bases have contacted the cylinder head. Install 4 coil mounting bolts. Loosely tighten 4 bolts just enough to allow bolt bases to contact cylinder head. Do a final tightening of each bolt in steps down to 29 N·m (250 in. lbs.) torque. Do not apply full torque to any bolt first.
To reassemble your device, follow these instructions in reverse order. Always use a spark plug socket that has a rubber insert to hold the spark plug into the socket. Use the socket and a extension without a ratchet to hand tighten the spark plugs. Ensure that they can be easily screwed into the spark plug hole. There is always a risk of cross threading when using the ratchet. Position ignition coil rubber boots to all spark plugs. Push down on coil assembly until bolt bases have contacted the cylinder head. Install 4 coil mounting bolts. Loosely tighten 4 bolts just enough to allow bolt bases to contact cylinder head. Do a final tightening of each bolt in steps down to 29 N·m (250 in. lbs.) torque. Do not apply full torque to any bolt first.
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18 件のコメント
This is great, my jeep has a misfire on cylinder 4 and this helped me locate and get to the coil and spark plug, straight forward easy to follow, thank you, I will update once i'm done.
Finished replacing the plugs, my check engine light went away, misfire is gone, thank you!
well done, great post
thank you..
Very nice detailed instructions. The illustrations make it very simple to follow. The list of tools is exactly whats required. Thank you for putting the time in for such detailed instructions for a task that is very important to fuel economy as well as power/torque.
Even the plug gap and type are supplied. Thanks again.
Wow. that was easy. Thanks for the pics and step by step instructions.
Great instructions! Only thing missing was torque on plugs. I put anti seize on the spark plug threads to make it easier to get them out next time.
After looking around for a few days, this is ABSOLUTELY THE BEST explanation I’ve seen, thus far!!!!!
THANK YOU…THANK YOU…THANK YOU!!!!!!
Thanks for the instructions. It always helps to ask someone who has done it before hand. makes the job so much easier.
Your the best straight an clear
I was told you have to replace the ignition coil with everything spark plug change BC it has a seal on it and BC its all one strip once the seal has been broken aka the coil taken off it needs replaced
jennifer Mooney that is not necessary. I have replaced the spark plugs on “the Beast” numerous times and still have the original coil packs (240,000 miles and no issue;)
Can anybody tell me about the cover that’s over that last bolt on the coil rail that has a ground strap cover bolted down on the engine. Firewall to rear engine ground. Information on that cover like the name for it and where I could find one would be much appreciated.
Thank you for tutorial. I changed the plugs and it runs with a miss now.
Did it have the miss before? What else did you check? Could be an issue with individual coil as well as many of the sensor. Even if the Service Engine Soon light has not come on, I’d get the OBD scanned. You’ll be amazed by how many codes are generated but do not trip that light. Let us know what you find out.
@sbd74 you already have :-) You came back and said thank you. that is all it takes. Pay it forward, help others and always remember:
Repair is War on Entropy!
