Should I attempt to replace the spark plugs on my 4.0L or let the dealer try?

[Worktofish]

Just hit 99,000 miles on my 2006 XLT 4.0L 4x4 and was about to do the 100k maintenance. However, I noted that there are all sorts of warnings about spark plug breakage.

I called the dealer, and they said it's really a V8 issue.

Should I attempt?

 

[Machine090767]

There has been no issues for spark plug breakage on the 4.0. Like the dealer said, it was a problem for the 4.6's.
So, it's your choice if you want to do it yourself or have the dealer do it.

 

[Tech By Trade]

Not sure why you would waste money going to the dealer. Its about a 10 minute job on the 4.0l.

 

[beauboy]

If you're really worried about possible breakage, it won't hurt to squirt some PB Blaster into each hole and allow it to sit for about 30 minutes. I did that on my V8 and replacing my plugs was a breeze (literally)!

 

[Turdle]

even if you have to buy a few tools for this, you'll save a lot of $$. I have so much confidence in you I suggest buying a six pack of real good beer, so you can pop one when done and savor the flavor of a job done yourself.

 

[Worktofish]

OK, point taken

I just saw the 4.0L listed on various websites, such as http://repairpal.com/spark-plugs-may-be-difficult-to-remove-293

 

[edwx]

Yeah, it's doable. If I can do it, anybody...........

 

[Explorer_PL]

Those instructions are for 4.6 v8, different animal.

 

[SoCal2V]

Stupid easy to replace on the 4.0 in these trucks. Cylinders 2 and 3 (especially #3) are a little awkward to get to but that's it.

 

[Worktofish]

Thanks guys. While I would not call it "easy" or a "10 minute job", they came out in one piece after soaking in PB Blaster, working them in an out, and stopping and starting to resoak some of them. I definitely should have replaced them sooner as the factory recommendation is too long. Lesson learned there.

I also swapped out all 4 brakes. Amazing that after 11 years there was still a lot of pad left. However, I think they petrified, so it was good to replace and bleed the brakes too.