Wow! Thanks for the education. I have a question... How do iridium plugs work? I'll be sure if I choose platinums next time to go with double plats.The wasted spark system, where 2 plugs share one coil, one of the plugs have a reverse current flow, that reverses anode/cathode, and in a case of a single platinum plug, half of them will transfer the softer steel to the platinum with the current, eating away the plug faster than if it was just plain steel on both sides.
You need to use double platinum, where there is platinum on both sides of the spark, with these kinds of ignition systems. BUT, like people have been posting, for the Commander and other Chrysler vehicles, with this kind of ignition, some have found that other than the specific OEM plug can NOT be as reliable or cause problems.
I'm no mechanic, and certainly not any kind of authority in all things automotive, but my approach has always been that regular maintenance per the owner's manual is "cheap" insurance that you will avoid potential problems or premature wear of your vehicle. I try to do as much of the work myself to keep costs down.I just bought a 2007 Commander Hemi Limited, it has 51k on it, I was told that I needed to change the spark plugs at 60k??? currently I'm getting 18.5pmg on the highway AND 14-15MPG around town... in atlanta!!!! I'm very happy with the milage.... do I really need to change the plugs at 60k??
... does anyone make anything bigger thana 2 inch?? I was wanting to get atleast 4 to 6 inch.. I'm even willing to do a solid axle converion if needed... " I have to apoligise, i know very little about this jeep thus far... I need all the help that I can get with this one...
See this thread---> http://www.jeepcommander.com/forums/showthread.php?t=8393I do plan on eventually putting a lift on it.... does anyone make anything bigger thana 2 inch?? I was wanting to get atleast 4 to 6 inch
Is there a write up for changing the plugs in a 5.7L Hemi? I used the search but only found write-ups for the non Hemi's.
Is it very difficult, and are there 2 sets of plugs on the Hemi? Sorry I am a rookie with Mopar.
...............................06-19-2008, 05:17 PM
Join Date: Apr 2007
Location: Surprise, Arizona
Changing the HEMI's plugs is not "Hard", just time consuming. My service tech at Jeep (Barry Barret @ Moore in Peoria is just great) told me most of the cost is labor. I was quoted around $300 also.
Have someone help you out. One person can start taking the boots off, and the other can follow around and swap and gap the plugs. Removing and replacing the boots is kind of a pain, but getting the correct angle to wrench the plugs out on the driver rear cylinder is the trick. My neighbor loaned me a tool that is just for this task, and it worked great, although not 100% necessary:
I believe this was about $5 at Checker.
The #1 fact is:
Unless you are a complete idiot and don't know what a gapper or a boot is, you can't mess this up. Took me about 2 hours with a friends help. Good Luck!
...................08-31-2009, 08:33 PM
Join Date: Jun 2009
Location: Long Island, New York
I changed my plugs in about 2 1/2 hours. The first 20 minutes was to get familiar with how to do it and carefully remove the first ignition box (the hardest one, near the battery). The next hurdle was figuring out the correct socket extensions, since the wells are deep. My new favorite tool is a 3/8 inch heater hose I replaced on my chevy malibu. I used the 8" long rubber hose to insert over the spark plugs to remove them from the wells. I also used this hose to protect the porcelin on the new plugs while easing them into the wells and turning them hand tight. The best combination of socket extensions I found to be two, 2" extensions. On the cylinders that are obstructed by the fuse block, or other hoses, I was able to hold the plug socket in place, slip a 2" extension, slide it down (don't drop it, it will go below the well), and add another 2" extension. I then used a ratchet to remove & replace the plugs. On the cylincers with no obstructions, a 6" extension is ok. I avoided using swivel sockets, since i read that they actually put a lateral force on the plug and could sheer the plug if a lot of pressure is used. I used anti-sieze compound on the threads and permatex dielectric grease on the plugs. I found a 3 ounce pressurized can of grease at Advance Auto for $10 (better than the $3.79 price of 0.33 oz). I used the champion 570 plugs, since they are the OEM plugs and don't plan on going more than 30,000 miles until the next change. I also read a lot of bad things on other dodge/jeep/chrysler forums when people used other than resistor plugs on their HEMI's. Another tip, is ensure you back the bolts all the way out on the ignition boxes. Once you start to pry them off, don't force them, some threads may still be caught on the block, you may need to turn them again once the ignition box moves a little bit. You should also use a torque wrench 18NM or 12-15 ft-pounds is not too tight, it would be very easy to damage the plugs or threads if you go too tight.
Some prices: Auto zone has the champion 570 plugs for $1.59. Advance Auto has them for $1.99. If you print out the internet price from Autozone, you can take it to advance auto and they will match the prices. As an added bonus, Advance Auto has a $5.99 coupon you can use (if the manager is nice and lets you do the price match and coupon at the same time). 16 plugs for $22 (with tax). Sweet!!!!
I learned a lot from this forum in such a short time, I hope this helps.