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  #85  
Old 09-19-2014, 12:05 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by srockrae View Post
I have a 2011 5.7 Hemi Limited Grand Cherokee. I asked my dealer if they would put the NGK IR plugs in instead of the copper ones. They insisted that they had changed the head design in the newer Hemis and if you put the IR plugs in them it will burn up the cylinder heads. Said the IR gets way hotter. Sounds like bull but I did not want to risk it so I had them put the copper ones in.

What yall think?
I think you have a service advisor at yet another Jeep Dealership that truly has no idea what he is talking about!! IR plugs will burn up the cylinder heads?? How? Why? Maybe he's stuck in a time warp and is referring to pre 2009 Hemi's.... but I'm pretty sure none of those old hemi's made it into 2011+ WK2's.

These IR plugs have only one listed application from NGK........ that is a Chrysler 5.7L hemi. They are OEM Mopar parts with the correct heat range as spec'ed by Chrysler to NGK for 5.7 L hemi V8's.

Changed the head design in the new Hemi's??
When did that happen.... from 2013 to 2014 models when Chrysler started installing them as OEM parts?? Really?

The IR plugs were first installed in Chrysler police package vehicles for 100K miles maintenance intervals. Chrysler made them OEM parts for all 2014 5.7L V8's to keep up with other manufacturers 100K miles maintenance schedule's.
These IR plugs are just a better quality longer life OEM NGK 100K mi plug vs. the OEM NGK 30K mi copper plugs.

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  #86  
Old 09-23-2014, 11:31 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by srockrae View Post
I have a 2011 5.7 Hemi Limited Grand Cherokee. I asked my dealer if they would put the NGK IR plugs in instead of the copper ones. They insisted that they had changed the head design in the newer Hemis and if you put the IR plugs in them it will burn up the cylinder heads. Said the IR gets way hotter. Sounds like bull but I did not want to risk it so I had them put the copper ones in.

What yall think?

Mine have not burned up yet... 5K miles... My cool dealer service dept gave me the part # in person.

Other option is to run the coppers longer, as most report they look fine at 30K miles as mine did.
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  #87  
Old 11-13-2014, 07:56 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by srockrae View Post
I have a 2011 5.7 Hemi Limited Grand Cherokee. I asked my dealer if they would put the NGK IR plugs in instead of the copper ones. They insisted that they had changed the head design in the newer Hemis and if you put the IR plugs in them it will burn up the cylinder heads. Said the IR gets way hotter. Sounds like bull but I did not want to risk it so I had them put the copper ones in.

What yall think?
Anyone care to comment?
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  #88  
Old 11-15-2014, 01:22 AM
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Originally Posted by steveo View Post

Anyone care to comment?
I switched mine out from the copper core plugs to the iridium ones at approximately 68k miles and haven't had any issues approaching 72k miles right now. The notion that Chrysler switched head design with the 2014s is completely false. The two engines are identical and the sheet metal is the only difference between 2011-2013 and the newer Jeeps. Rest assured you can put the iridium plugs in without worry. Hope this helps.
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  #89  
Old 12-03-2014, 07:18 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

Just ordered my plugs from JustForJeeps. I'm at 41500 miles, just haven't had the time to get to this. I'm hoping my mgp improves, as I'm getting below 19 on the highway now. Thanks for the great write-up!
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  #90  
Old 12-22-2014, 03:11 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Changing 16 spark plugs makes me miss my WRX. Just a little.
Took me about an hour and a half, not bad.
In other news: Maybe I should have changed my spark plugs a while ago. Eww (42,500 miles).
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  #91  
Old 12-23-2014, 11:37 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by phisch View Post
Changing 16 spark plugs makes me miss my WRX. Just a little.
Took me about an hour and a half, not bad.
In other news: Maybe I should have changed my spark plugs a while ago. Eww (42,500 miles).

That looks pretty good..

I traded my WRX for my jeep.. Never looked back. Of course when I get a snow-jones I take my wifes' 328Xi out.
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  #92  
Old 12-24-2014, 12:19 AM
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Quote:
Originally Posted by phisch View Post
Changing 16 spark plugs makes me miss my WRX. Just a little.
Took me about an hour and a half, not bad.
In other news: Maybe I should have changed my spark plugs a while ago. Eww (42,500 miles).
Not that bad at all. Mine had no tips when i changed them. Still fired and was getting about 16 on the highway. Ops wrong picture.. that was my change after i replaced them again. Had a leak in my valve cover.
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  #93  
Old 12-28-2014, 12:59 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

Update: back to 20.9 on my highway trip back home for Christmas. And that's with the heavy Goodyear A/T Adventure tires, first I've hit that high in a year. And fuel is $1.79/gal in Indiana! It's a Christmas miracle!
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  #94  
Old 12-29-2014, 06:37 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Well coming up on my 3rd Plug change, The past 2 changes i dont think that they were ready to be changed. but the Warranty says Every 30000mi and dont want any issues with the $2300 Mixi Care extended warranty
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  #95  
Old 03-08-2015, 11:33 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

Thanks for an informative post. No time to read all 8 pages. Doing my plugs today and just going with stock Champion 446 plugs. Should be fine. Bought my 09 Commander Overland with 5.7 Hemi in Dec last year. 127K miles, no service history. Got a code for misfire in #3 cylinder and figured it could use some new plugs anyway.
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Old 03-08-2015, 01:17 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by Otto in C-Ville View Post
Thanks for an informative post. No time to read all 8 pages. Doing my plugs today and just going with stock Champion 446 plugs. Should be fine. Bought my 09 Commander Overland with 5.7 Hemi in Dec last year. 127K miles, no service history. Got a code for misfire in #3 cylinder and figured it could use some new plugs anyway.
Your in the wrong forum for an '09 Commander w/a 5.7 Hemi engine!
A lot of the plug discussion in this thread doesn't apply to you......

Jeep went to OEM copper plugs for all 2011 and up WK2 Hemi's manufactured by NGK and NGK platinum plugs are OEM for all 2014 and up Hemi equipped WK2's.
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