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Unread 02-27-2009, 12:19 PM   #1
gsr181
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Platinum Plugs were the problem 5.7L Hemi Stall.

I have a 07 Commander Limited with the 5.7L Hemi. I installed the Champion 3570 Platinum Plugs(that i bought at PEP Boys)and the car started to stall. I took the Jeep the the dealership explained to them what I had done and 30 days later and 3 different modules(PCM,FCM,WIN) replaced they blamed it on the spark plugs. They explained to me that the Hemi engine will not run properly with the Platinum Spark plugs only the original copper plugs. I am a ASE certified mechanic of 10 years and I have never heard of anything like this. All the mechanics at the dealership also have never heard of anything like this. It took an engineer form Detroit that they flew out to figure it out. Do any of you guys run Platinum Plugs? Have any of you heard of something like this.
Thanks for your guys Help

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Unread 02-27-2009, 02:22 PM   #2
Acidcold
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That is the most ridiculous think i have heard, car related! I don't understand how a "Platinum" plug would stall the engine... i know a coil will but not a plug. good luck.
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Unread 02-27-2009, 02:44 PM   #3
LTrainGC
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Sounds a bit far fetched, but I used the coppers when I did mine....
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Unread 02-27-2009, 03:39 PM   #4
DarrylFlynn
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Quote:
Originally Posted by gsr181 View Post
They explained to me that the Hemi engine will not run properly with the Platinum Spark plugs only the original copper plugs.

SO Did putting Standard Original Copper Plugs back in sort this out, You didn't tell us?




Regards Darryl
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Unread 02-27-2009, 03:59 PM   #5
Texas WJ
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I've actually heard this before, that the Hemi sometimes doesn't like the platinum plugs. Can't tell you why, but if it came from the factory with copper then that's what I'm sticking with.
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Unread 02-27-2009, 04:18 PM   #6
robpp
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Quote:
Originally Posted by Acidcold View Post
That is the most ridiculous think i have heard, car related!
so is having a vehicle where you cant check trans fluids...
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Unread 02-27-2009, 04:19 PM   #7
robpp
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PLUGS from WKJEEPS- what a mess

3.7 V8
Mopar (NGK) p/n SPZFR6F11G
(0.042 gap, 8 plugs, tighten to 20 ft. lbs.)


4.7 V8 (2005-2007)
Mopar (Champion) p/n SPRC12MCC4
(0.40 gap, 8 plugs, tighten to 20 ft. lbs.)

(NOTE: The 4.7L V8 engine is equipped with copper core ground electrode spark plugs. They must be replaced with the same type/number spark plug as the original. If another spark plug is substituted, preignition will result.)



4.7 V8 (2008-2010)
Mopar (Bosch Nickel Yttrium) p/n 5149050AB (intake side)
(0.40 gap, 8 plugs, tighten to 20 ft. lbs.)

Mopar (Bosch Iridium) p/n 5149888AA (exhaust side)
(0.50 gap, 8 plugs, tighten to 20 ft. lbs.)

CAUTION: This engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs is used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Bosch Nickel Yttrium plugs. The lower row uses Bosch Iridium plugs. DO NOT INTERCHANGE THESE PLUGS.



5.7 V8 Hemi (2005-2008)
Mopar (Champion) p/n SPRE14MCC4
(0.045 gap, 16 plugs, tighten to 13 ft. lbs.*)

(*NOTE: The 5.7L V-8 is equipped with torque critical tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)



5.7 V8 Hemi (2009-2010)
Mopar (Champion ?) p/n SLZFR5C11G
(0.043 gap, 16 plugs, tighten to 13 ft. lbs.*)

(*NOTE: The 5.7L V-8 is equipped with torque critical tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)



6.1 V8 Hemi
Mopar (NGK) p/n SPLZTR5A13
(0.50 gap, 16 plugs, tighten to 13 ft. lbs.*)

(*NOTE: The 6.1L V-8 is equipped with torque critical tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)
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Unread 02-27-2009, 05:50 PM   #8
gsr181
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Yea after installing the original copper plugs it fixed the problem but they stated tha the vehicle still might have issues with the WIN and PCM module.
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Unread 02-27-2009, 06:04 PM   #9
jeepsterjc
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Engineered obsolescence. Only original copper plugs? Well I get those'll soon cost as must as platinum/iridium/gold/jems/tritium and uranium now.

I have a 94 ZJ, 318 and I changed my platinums after almost 60000 miles... Yeah, yeah... but I did get my money's worth out of it!!

Did the cap rotor and wires at the same same. Runs like new.
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Unread 02-27-2009, 06:43 PM   #10
Bavaqua
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I used champion plats in my 03 hemi and never had issues
That sure is weird though...
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Unread 02-27-2009, 07:33 PM   #11
Acidcold
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Quote:
Originally Posted by robpp View Post
so is having a vehicle where you cant check trans fluids...
What vehicle is that? my 4.7 has it.
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Unread 02-27-2009, 10:14 PM   #12
icecreamman
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I have experience with this on another vehicle. On bimmerforums.com the concensus (which I have personally tested) is that my e36 bmw m3 only runs it's best with copper plugs. People that own them for a while end up back at copper plugs eventually.

It's possible. I will be putting factory material plugs in when I replace them in my 05 HEMI.
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Unread 02-28-2009, 07:34 PM   #13
danniboi
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Quote:
Originally Posted by robpp View Post
PLUGS from WKJEEPS- what a mess

3.7 V8
Mopar (NGK) p/n SPZFR6F11G
(0.042 gap, 8 plugs, tighten to 20 ft. lbs.)
....
...
..
.
Aren't the 3.7's a V6 not a V8 and require 6 not 8 plugs?
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Unread 03-01-2009, 05:56 AM   #14
kentman
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I don't buy it. Until someone explains to me based upon chemistry or some other sort of deterministic basis, I cannot buy that a different metal does not work. It is just electricity jumping the gap from a metal substance.

I will be installing platinum plugs in the Hemi very soon, and we will see if I have a spark issue or not. I have never had a problem with platinum plugs on anything else in the past. If I do have an issue, I will surely try to swap back to copper. I just do not believe that I will have an issue.

There must be something else happening in your situation. I would be worried about the gap size, the carbon build up in the chamber, and fuel injector spray pattern more so than copper versus platinum.
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Last edited by kentman; 03-01-2009 at 06:07 AM..
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Unread 03-01-2009, 10:42 AM   #15
Bavaqua
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Kent, I went to plat. Champions in my 03 Ram with around
60 thousand miles on the stock copper Champs. I checked the
Gaps on the originals and they were all around .058-.064.
The plats worked great in my truck. Only thing I ever heard
People having issues with in the Hemis is using exotic multi-prong
Plugs.
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