paker Posted November 17, 2019 Report Share Posted November 17, 2019 (edited) Odometer read 94k miles. According to this forum, time to replace spark plugs. Bought spark plugs, PCV valve, and plenum gasket set as recommended here. Watched a few youtube videos. Front 3 were easy. Now rear 3. The coils wouldn't come out. Did twisting and pulling alternatingly. No use. Yanked really hard and they came out. Dropped 5/8" socket into the well to remove the plug. No engagement. What the heck is going on? Pulled out a mirror and looked into the well. There is rubber at the bottom! Apparently, the rubber boot was welded to the spark plug ceramic (due to heat and age I suppose). When the coil was pulled up, the bottom portion got torn up and remained in the well. What a mess! Beer time. I need to calm down. I remembered a dental pick set. Relying on the feel, I slowly detached the rubber from the plug post. After 30 miinutes all rubber pieces came out. Old spark plug gaps were between 70 and 80 mils, really worn down from 54. I thank the forum for recommending plug change at 90K miles. Could have been earlier like 70 or 80k miles. My next plug change will be after 70k miles. Lessons learned: 1) Be prepared for boot damage. Apply silicone dielectric grease to the boot to prevent boot-to-spark plug welding. 2) This video was most helpful except for a bolt in the far back (2:45) and an electrical plug (8:00). Both are missing in 2010. The electrical plug is apparently for heated PCV valve. 2010 has a non-heated version. Edited November 17, 2019 by paker 2 1 Quote Link to comment Share on other sites More sharing options...
erikrichard Posted November 18, 2019 Report Share Posted November 18, 2019 (edited) This exact thing happened to me with 2 of the 3 rear plugs, after googling wth was going on I learned this is a very common thing to happen. Shit design, don't blaim yourself. Edited November 18, 2019 by erikrichard Quote Link to comment Share on other sites More sharing options...
Special_K Posted January 14, 2020 Report Share Posted January 14, 2020 On 11/18/2019 at 1:06 PM, erikrichard said: This exact thing happened to me with 2 of the 3 rear plugs, after googling wth was going on I learned this is a very common thing to happen. Shit design, don't blaim yourself. Not a shit design, happens with literally every kind of plug boot out there if not properly maintained (dielectric grease and regular maintenance). This has never happened to any of my cars or the hundreds that I work on solely because we change plugs every 50K and clean everything and lubricate. Maintenace is key to easy work, even on something that isnt an optimal design. Quote Link to comment Share on other sites More sharing options...
PaulSchott Posted January 14, 2020 Report Share Posted January 14, 2020 My 2007 has the extra connector on the intake. Big pain to connect and disconnect blind. Mine is due again soon. Done at 90,000 first time and we are at 145,000 now. I did replace a coil 6 months ago because I couldn't get just the boot and it's been fine since. Next time I'll replace all the boots while the intake is off. Luckily the bad coil was in the front. It takes 20 minutes to change all 6 plugs in my wife's 4.0 Grand Cherokee. 1 Quote Link to comment Share on other sites More sharing options...
14AWD3.5 Posted June 2, 2020 Report Share Posted June 2, 2020 Hmm, I have 64ish K now on my 14’, guess i’d better get it done. About how many hours did it take? Quote Link to comment Share on other sites More sharing options...
14AWD3.5 Posted January 2, 2021 Report Share Posted January 2, 2021 Got the dealer to do it, $230 total. Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted January 3, 2021 Report Share Posted January 3, 2021 I also had the dealer do mine at 90k maintenance interval. Won't tell you what I paid (heh, heh, heh). Quote Link to comment Share on other sites More sharing options...
The Blue Wedge Posted January 7, 2021 Report Share Posted January 7, 2021 My dealer quoted me almost $400.00 for this. 2014, 3.5L Quote Link to comment Share on other sites More sharing options...
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