Hemi spark plugs...why not use platinum? - Page 2 - JeepForum.com
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post #16 of 27 Old 08-21-2013, 03:51 PM
10Xk
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What is the average price everyone is paying for the OEM NGK plugs?

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post #17 of 27 Old 08-21-2013, 05:57 PM
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X2....................

GM V6's are the worst,more so those back 3 wires.[/QUOTE]

Back in the day I had a 92 Lumina with the 3.1 v6. A back plug blew out, what a terrible job! It's good to know about the 30k, mines got 23k
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post #18 of 27 Old 08-21-2013, 06:05 PM
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Quote:
Originally Posted by 10Xk View Post
What is the average price everyone is paying for the OEM NGK plugs?
Between $60 and $70 a set at discount outlets, at dealers parts counters about $80.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #19 of 27 Old 08-21-2013, 06:33 PM
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I was quoted 65.44+ tax for 16 through dealer after haggling and $320 if they do it. It has OEM NGK but OEM champions which were used before 09 are $1.65, can they be used in place of NGK? Any issues with doing it, anything to watch out for?
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post #20 of 27 Old 08-21-2013, 08:56 PM
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Just that many say Champions seem to have a higher failure rate than NKG. At $1.65 they could be seconds... but I dunno. Could just be a great deal.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #21 of 27 Old 08-21-2013, 09:46 PM
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Quote:
Originally Posted by 10Xk View Post
I was quoted 65.44+ tax for 16 through dealer after haggling and $320 if they do it. It has OEM NGK but OEM champions which were used before 09 are $1.65, can they be used in place of NGK? Any issues with doing it, anything to watch out for?
In a Jeep the Champion plugs are a much better plug then the NGK's.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #22 of 27 Old 08-22-2013, 06:42 AM
ColdCase
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In a Jeep the Champion plugs are a much better plug then the NGK's.
That's not right, most here have had better luck with NKGs on 2011+ motors. NKGs are a better made plug. There is certainly no significant difference between them. Some swear by champions in earlier year and classic hemis, however.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #23 of 27 Old 08-22-2013, 07:56 AM
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That's not right, most here have had better luck with NKGs on 2011+ motors. NKGs are a better made plug. There is certainly no significant difference between them. Some swear by champions in earlier year and classic hemis, however.
I hate both brands but run Champions in my Jeep but they dicontinued the correct plugs.Never liked NGK,besides there O2 sensors(NTK).


On a side not NGK used to sponser my buddy's drag car,made custom plugs for it and sent him a 10 sets,turned out all 10 sets were flawed.He found out the hard way when one came apart at 8500rpm's with the full 500hp NOS shot going destroying at $60k engine and most of the car.NGK x-rayed the other plugs and found all had micro cracks and most likely would have failed also.The only good thing is they bought him a new engine and new car then he told them to pound sand.He now uses Champion plugs with better luck.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #24 of 27 Old 08-24-2013, 08:23 PM
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$84 for 16 OEM NKG plugs and two quarts or Mopar NV245 transfer case fluid. Pretty happy compared to the $7 per plug and $21 per quart originally ask by dealer.

The plugs removed had gaps varying between .043 and .045, is this normal for 30k miles?
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post #25 of 27 Old 08-28-2017, 09:44 AM
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Just a quick comment:

I had issues with my 2002 Grand Cherokee with a 4.7 engine when I tried to be nice and put expensive plugs in it. I don't remember the brand but immediately after the change it missed like crazy. I reinstalled the originals and it ran fine. Went back to the parts store and purchase the OEM Champions problem solved. I used to drag race Mopars and I tell you they like Champion plugs!

Forward to my 2007 Grand Cherokee with 5.7 Hemi. I had problems that I thought was transmission. (So did dealer tech) Following many attempts at resolution I finally persuaded the dealer to call the Chrysler Tech Department. While talking as conference call with the Chrysler engineer the real issue was revealed, (I am an electrical engineer and immediately recognized what the Chrysler engineer was talking about). The reason for the plug changes early (30000 miles) in the Hemi is that there is feed - back to the PCM during the spark event. The current is monitored by the PCM to help with engine tuning. (Resistance, it is true that if you were to measure the resistance of a plug with an ohm meter on the bench it would read infinity, not so during the duration to the arc / spark.) I had neglected to change the plugs at the 30000 mile interval and was well into 100000 miles on the plugs. Because the gap had eroded the secondary voltage to create the spark went very high causing a dirty power feed back to the PCM resulting in the PCM rebooting, (same as your home computer being affected by unclean power). This in turn resulted in the transmission briefly losing control of selected gear set which gave a jolt to the power train which at times was severe, other time just a shudder.

Lesson learned after several trips to the dealership, change the plugs as specified by the manufacture with OEM spec parts, don't hesitate to contact Chrysler tech support. They know what they are talking about, they designed and built the dam thing.

Respectfully:

Tom Clement, very satisfied Jeep owner
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post #26 of 27 Old 08-28-2017, 10:02 AM
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And thank goodness that from 2014 on the replacement interval was increased to 100K!

2014 Deep Cherry Red GC 4X4 V8 QDII
2012 Crystal Red Cadillac CTS-V Coupe
2011 Crystal Red Chevy Corvette Z06/Z07
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post #27 of 27 Old 08-30-2017, 05:44 AM
danelo
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I have always stayed with OE spark plugs. Like a previous poster mentioned the ignition system was designed to work with them.
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