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mwilk012

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To remove and replace plugs on the 3.6L, just remove the plug wires and pull the plugs. They're in the center of the cam covers like an old hemi.

To get to the oil filter housing/precooler, these have to come off.
upper intake manifold.jpg
lower intake manifold.jpg
There are no plug wires, and one bank of plugs is under the intake plenum.
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DanW

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There are no plug wires, and one bank of plugs is under the intake plenum.
Yeah, I just watched a YouTube video and talked to a buddy who just changed his and it confirms what I thought. You've got to take the intake off. But it isn't too hard.

Btw, my buddy's 3.6 in his JK had 165k miles on it on the original plugs! He said it was starting to misfire but ran perfectly right up to 163k or so. It's back to perfect after the plug swap. That's pretty impressive!
I helped him last spring change his diff, transmission, and t-case lube. I think he had about 155k on them at the time. All of those were original, too. They looked like crude oil coming out. Somehow, he's never had any problems. Yikes! We put Valvoline synthetic gear lube and ATF+4 and Pennzoil Synchromesh in it, so he's good to go.
 

roaniecowpony

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There are no plug wires, and one bank of plugs is under the intake plenum.
I missed that, you're right. Wow. The upper intake manifold indeed does have to be removed....seems like they could have done better. Thankfully we have 100,000 mile plugs.

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roaniecowpony

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Yeah, I just watched a YouTube video and talked to a buddy who just changed his and it confirms what I thought. You've got to take the intake off. But it isn't too hard.

Btw, my buddy's 3.6 in his JK had 165k miles on it on the original plugs! He said it was starting to misfire but ran perfectly right up to 163k or so. It's back to perfect after the plug swap. That's pretty impressive!
I helped him last spring change his diff, transmission, and t-case lube. I think he had about 155k on them at the time. All of those were original, too. They looked like crude oil coming out. Somehow, he's never had any problems. Yikes! We put Valvoline synthetic gear lube and ATF+4 and Pennzoil Synchromesh in it, so he's good to go.
I found that step (hyperlink) to remove the upper intake manifold buried in the coil removal steps.

Looks like about 20 steps in the removal, mostly disconnecting hoses and wires, etc..
 
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mwilk012

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I missed that, you're right. Wow. The upper intake manifold indeed does have to be removed....seems like they could have done better. Thankfully we have 100,000 mile plugs.

spark plugs L bank.jpg
How many decades has it been since you changed spark plugs?
 

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I found that step (hyperlink) to remove the upper intake manifold buried in the coil removal steps.

Looks like about 20 steps in the removal, mostly disconnecting hoses and wires, etc..
And don't forget to stuff rags in those intake holes. My big fear would be dropping something down in there! Lol!
 

roaniecowpony

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How many decades has it been since you changed spark plugs?
Well, thinking about it, the last few vehicles I've had, I got rid of before they hit 100k. My current GMC pickup is approaching 100k. Probably time to trade it in. LOL. Those LS engines do actually have spark plug wires. ? I've seen em.
 

mwilk012

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Well, thinking about it, the last few vehicles I've had, I got rid of before they hit 100k. My current GMC pickup is approaching 100k. Probably time to trade it in. LOL. Those LS engines do actually have spark plug wires. ? I've seen em.
Yep, and pushrods. Ford’s 6.2 has both coil on plug and plug wires. Some version of the 5.7 does as well.
 

roaniecowpony

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Yep, and pushrods. Ford’s 6.2 has both coil on plug and plug wires. Some version of the 5.7 does as well.
I've had 4 LS powered trucks/car in a row and all have given great service. I like the engine, but recognize it's probably in its twilight years. The SFC on a 2 valve N/A V8 is just not going to cut it in the very near future, with CAFE climbing steeply.
 

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My JK's 3.8 is supposed to go 100k, and I'd bet it could. BUT, it starts pinging at about 60k. I've noticed the plug gaps widen a bit by 50k, so I have settled in on changing them at 40k. I'm going to probably change the JL at 75k as a preventative item, unless it gives me a reason to do it sooner. I'm at 55k now and it runs perfectly.
 

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Well, thinking about it, the last few vehicles I've had, I got rid of before they hit 100k. My current GMC pickup is approaching 100k. Probably time to trade it in. LOL. Those LS engines do actually have spark plug wires. ? I've seen em.
Gosh. I'm odd man out. I have never traded in a vehicle other than my XR600 back in the 90's. I run almost everyone of my rigs into the ground. 20 years and 300,000 miles is typical. I look at all my vehicles as a tool.
 

mwilk012

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Gosh. I'm odd man out. I have never traded in a vehicle other than my XR600 back in the 90's. I run almost everyone of my rigs into the ground. 20 years and 300,000 miles is typical. I look at all my vehicles as a tool.
Judging by the number of threads about warranty, I would bet that most of this forum does not keep vehicles up to even 200k. I’ve seen people refer to 100k as a high mileage vehicle.

City dwellers I’m sure.
 

roaniecowpony

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Gosh. I'm odd man out. I have never traded in a vehicle other than my XR600 back in the 90's. I run almost everyone of my rigs into the ground. 20 years and 300,000 miles is typical. I look at all my vehicles as a tool.
I had one vehicle, a 79 El Camino, that I put over half a million miles on. That's saying something when you consider the low build quality of the day. I went thru 3 engines, 2 transmissions, A/C compressors and stuff, heater cores, a handful of plastic covered dashboards, headliners, full interiors, 3 paint jobs, suspensions, and I can't recall all what. So, I'm familiar with the concept. I did all the work myself except the first two paint jobs. The last paint job, I mechanically removed all the paint, re-did the body work, took every removable part off (fenders, hood, doors, interior, etc.,) to color change it in poly. That will be my last paint job.


Judging by the number of threads about warranty, I would bet that most of this forum does not keep vehicles up to even 200k. I’ve seen people refer to 100k as a high mileage vehicle.

City dwellers I’m sure.
In my later half of my carreer, my income was such that it allowed me to get new vehicles often enough that I didn't have to spend my evenings and weekends working on them. I was spending more time at work and really had less time to work on vehicles. There's more to life than leaning under a hood or rebuilding the suspension over the weekend so you can drive to work Monday. In my early twenties I also bought my first airplane. That plane was an aerobatic plane that required a lot of maintenance. By my late twenties, I had two airplanes. Working on cars lost it's entertainment value.
 

The Last Cowboy

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Judging by the number of threads about warranty, I would bet that most of this forum does not keep vehicles up to even 200k. I’ve seen people refer to 100k as a high mileage vehicle.

City dwellers I’m sure.
Too many want the latest and greatest. This site/forum has to be the worst I've ever been on with people constantly trading over and over. Then they build it completely on day one. If it wasn't for the supply issues, we'd be seeing a lot more of those threads.
 

roaniecowpony

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Too many want the latest and greatest. This site/forum has to be the worst I've ever been on with people constantly trading over and over. Then they build it completely on day one. If it wasn't for the supply issues, we'd be seeing a lot more of those threads.
Why is wanting the latest and greatest a negative? ...and why is it "too many"? I think it's "the American way". That is: I think it's capitalism working its majic. People wanted clean water and steady sources of food, so the made reservoirs, piping systems, gardens, chicken coops and ranches. People want reliable, comfortable transportation, and some want recreational capabilities in their vehicles too. Need is the mother of invention and want is the mother of capitolism. You have to admit, "want" is a lot more fun than "need".
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