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2002 PT Spark Plug Question

 
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  #1 (permalink)  
Old 15 Sep 2012, 11:28 am
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Default 2002 PT Spark Plug Question

I have a 2002 Limited with 33K miles. I want to replace the plugs and wires. The NGK part finder recommends plug 5306 but most searches on this site recommended 4306.

Dumb question but why are folks using the 4306 vs. the recommended 5306?

Thanks.

Tipsy
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Old 15 Sep 2012, 01:18 pm
Badglas's Avatar
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Default Re: 2002 PT Spark Plug Question

Quote:
Originally Posted by tipsymcstagger View Post
I have a 2002 Limited with 33K miles. I want to replace the plugs and wires. The NGK part finder recommends plug 5306 but most searches on this site recommended 4306.

Dumb question but why are folks using the 4306 vs. the recommended 5306?

Thanks.

Tipsy
Hey Tipsy. I'm guessing here, as I don't know NGK very well. The 02 had an original plug gap of .050. The revised plug gap is .040. I'm guessing that the 5306 denotes .050 gap and the 4306 denotes .040 gap.

Ron
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Old 15 Sep 2012, 01:31 pm
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Default Re: 2002 PT Spark Plug Question

4306 is the recommended plug for a turbo application. 5306 is recommended for a normally aspirated (non-turbo) 2.4L. Something a stock 02 Limited doesn't have to worry about.
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Old 15 Sep 2012, 03:29 pm
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Default Re: 2002 PT Spark Plug Question

Quote:
Originally Posted by bandaide View Post
4306 is the recommended plug for a turbo application. 5306 is recommended for a normally aspirated (non-turbo)
Okay...thanks.

Tipsy
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Old 15 Sep 2012, 05:10 pm
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Default Re: 2002 PT Spark Plug Question

It all has to do with heat range. NGK's chart agrees with the tsb (#08-008-04) that was put out by Chrysler in 2004. We often refer to it here on this site, but only to refer to the 0.040 plug gap change. If you read the ENTIRE tsb it states that they are also recommending that we replace the previously correct plugs, the RE14MC's, with the RE16MC or the LZTR4A-11 = 5306. The two new plugs are one step colder than the RE14MC's. The tsb was for the NAs only, but I have always used the colder RE16MC's for all of my Turbo PT customers. It just made sense to me to use a colder plug in an engine that was turbo charged and had the resulting higher cylinder temps. I've used two differant brand (and style) plugs in my customers PT's and everytime I have checked their plugs they are burning perfectly, so I'm happy and my customers are happy.

Jerry
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Old 15 Sep 2012, 07:26 pm
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Default Re: 2002 PT Spark Plug Question

I also just use the stock Champions (RE14MCC5) that came with the car--a 2003 Limited N/A. They work fine. However, when I replace them, I will use the new specs from Chrysler--RE16MC.

Tim
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Old 15 Sep 2012, 07:37 pm
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Default Re: 2002 PT Spark Plug Question

unless champion changed ranges 14 is colder than a 16- if they still have range charts would be good to check
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Old 15 Sep 2012, 07:38 pm
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Default Re: 2002 PT Spark Plug Question

This car lives in a parking lot, not in my home state. I use it when I'm in town and will have very few tools available...definitely no torque wrenches.

Curious if anyone has a tip for how to tighten the plugs by feel? I realize feel is subjective and will vary by each individual and the socket wrench used but I'm a bit nervous about the potential to over tighten a plug in an aluminum head.

Thanks.

Tipsy

Last edited by tipsymcstagger; 15 Sep 2012 at 08:00 pm.
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Old 15 Sep 2012, 07:52 pm
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Default Re: 2002 PT Spark Plug Question

To begin with, the five bolts on the upper manifold (which you have to remove) are only 105 INCH pounds. Not a lot. At that small range, I want the tightening perfect, so I use an inch-pound torque wrench.

As far as the spark plugs go, tighten till they stop--then a quarter turn more--and no more! Or--use a the same inch-pound torque wrench and tighten to 156 inch pounds (which is 13 foot pounds on a foot-pound torque wrench).

Put some anti-seize on the spark-plug threads, too--not a lot.

Tim
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Old 15 Sep 2012, 08:44 pm
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Default Re: 2002 PT Spark Plug Question

For customers cars I seldom stray from what is recommended. Liability thing. However in a track car, or spirited street car I will try to persuade my customers to let me do a true Spark plug test to see what will work best with there particular driving style and target usual engine speed. Doing it this way seldom results in OEM recommendations for heat range or gap.
On my 2005 GT I did a power run with engine speed to 5800 and cut the ignition. After a few runs and only having Champion plugs to play with I run a .033 gap and a Champion 443 or as most know it RE16MC5.
The gap would be recognized as a .035- .040 by the usual methods of gaping. I use a gaping pliers that can gap spark plugs accurately and consistently with each one. Like the one pictured below.

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