Colder Spark Plug - JeepForum.com
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post #1 of 16 Old 10-08-2017, 08:14 PM Thread Starter
DannyC1
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Question Colder Spark Plug

Guys I need a colder spark plug than stock. It has the Champion but it cross references to an autolite 925. I don't see any 924 or 923 autolite available. What do you suggest?

Reason being I'm running a cat with a 2.5 outlet and strait pipe all the way back.

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post #2 of 16 Old 10-09-2017, 06:50 AM
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I don't understand why you're doing it, but why not switch to NGKs and use their heat range chart?

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post #3 of 16 Old 10-10-2017, 06:03 PM Thread Starter
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I thought the exhaust description would explain why I'm doing it. With strait exhaust, no muffler, the plugs are looking way to hot. If I had a way to add more fuel that would help but since I don't I need colder plugs.
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post #4 of 16 Old 10-10-2017, 08:15 PM
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NGK ZFR6F-11, stock #4291 for the V-Power copper plug. Those plugs are one heat range cooler than the stock plugs.

Not sure why you need it with a stock motor, I run the normal heat range with a stroker.


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post #5 of 16 Old 10-11-2017, 06:12 AM
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I'm successfully running Autolite 3924's in my '06. Tips look better. I'm about to take a 3000 mile trip and will check them when I get back. I may go another heat range colder to 3923's if it looks like I need to.
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post #6 of 16 Old 10-11-2017, 06:53 AM
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This is a fuel injected motor.
The only time you need a colder plug is when you're running sustained high RPMs like in a sports car on the track.

NGK ZFR5Ns are projected tip and work like a hot plug at low engine speeds and a cooler plug at higher engine speeds.

I use them with excellent results in all our 4.0s,

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post #7 of 16 Old 10-12-2017, 04:52 PM Thread Starter
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Ok here is what I went with. Not sure how they are going to work but we'll see. You can see the original Champion is running way to lean/hot. The 2288 should be one step colder. I'm running a strait pipe, no muffler just the cat. Strait pipes run leaner.
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post #8 of 16 Old 10-13-2017, 06:48 AM
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Straight pipes don't run leaner on a fuel injected vehicle. The oxygen sensor reads the exhaust and the computer adapts.

So, you think some double tipped gimmicky plugs are gonna help?
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post #9 of 16 Old 10-13-2017, 07:16 AM
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I agree with cruiser54.

What are your fuel trims?
what is the o2 sensor voltages?
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post #10 of 16 Old 10-13-2017, 07:19 AM
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Quote:
Originally Posted by jtec View Post
I agree with cruiser54.

What are your fuel trims?
what is the o2 sensor voltages?

He is applying old school thinking to a fuel injection system. Apples to oranges.

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post #11 of 16 Old 10-14-2017, 05:57 AM
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Just curious as to how that conclusion is reached. Regardless of fuel delivery method and such, how would you determine spark plug heat range needs? Most people have asserted that I need to run the factory heat range in my Jeep. Now, oddly, many of those same people also have strong opinions on which brand and style to run based on slight heat range differences within that recommendation.
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post #12 of 16 Old 10-14-2017, 06:18 AM
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I'm hoping the picture comes through. You should be able to see two of the iridium tips burnt off of the ground electrode. What is harder to see is the erosion of the porcelain and the ground electrode. These plugs and a set of factory NGK'S had all the signs of being too hot. A one-heat-range shift down and the truck is smoother and fuel mileage is up.
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post #13 of 16 Old 10-14-2017, 06:27 AM
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This is a comparison of the XP985's to the 3924's. The heat range is one step colder, the new plugs are copper/nickel compared to iridium, and the new ones don't have the projected tip.
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post #14 of 16 Old 10-14-2017, 07:50 AM
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Key word is NEW. The others are old and worn out as hell.

Not a good scientific comparison.

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post #15 of 16 Old 10-14-2017, 08:03 AM
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lots of apples and oranges.

on radiator support is the spark plug needed, only when a issue arises would i use something else.

do you have an issue with that recommended plug?

waste spark plugs will have opposite wear -and+. TMI
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