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Unread 01-24-2009, 05:52 PM   #1
KDOG2008
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Absolute best spark plugs for '04 Grand Cherokee Laredo....

Hi there, I've been out of here for awhile so I apologize if this is a redundant post....


Well its about that time I'm almost at 60K, so I'm gonna go ahead and do this before I go on vacation in April. I recently purchased a camper so I want to squeeze every little bit of power and efficiency out of my beast. I've heard positive things about Bosch Platinum +4s' - like they put out the best "bang" - to negative like they're junk and the tips break off into the cylinder. I've heard of Iridiums, but don't know much about them.


So I'll ask all you car peeps, what would be your choice for spark plugs? Cost isn't an issue since its only done once every great while. As far as the other stuff I use, I use Mobil 1 full synthetic oil and K&N air and oil filters.

Also do changing to high end spark-plug wires make any difference? Thanks for any help you can give me...

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Unread 01-24-2009, 05:54 PM   #2
gatorayde
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search, this has been asked and discussed many times.
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Unread 01-24-2009, 06:04 PM   #3
melloyello
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Best plugs I have ever seen for any internal combustion engines are NGK
But, IMHO, just stay clear of Autolite (aka. JUNK)
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Unread 01-24-2009, 06:12 PM   #4
dmolaver15
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i tried the bosch +4 thingys, they made my jeep run like a 3 legged dog on acid..

brand new set of champion copper cores are the best from what i've heard, BUT i've also been hearing about NGK plugs lately and that they're supposed to be very nice to jeep engines as well. i bought a set of NGK's from autozone about a week ago but i'm still waiting for the damn heep to come back from the dealer (grenaded rear end) to give them a try.
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Unread 01-24-2009, 06:59 PM   #5
Eroc147
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copper, must have copper, jeeps dont like that expensive crap, so be happy save a few bucks and your jeep will run better too!
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Unread 01-24-2009, 08:08 PM   #6
Turbonut
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You ain't gonna see any difference with spark plugs, regardless of cost, so stick with the stock plugs, and good luck with plug wires!!!!!!!
http://www.wjjeeps.com/service/sparkplugs.htm

Q: How much of a performance improvement can I expect from changing plugs?

A: A common misconception is that changing spark plugs will result in a large power increase. In most cases, removing even seriously worn out spark plugs will only result in very modest power gains, typically about 1-2% of total engine output. This could be even less for computer-controlled vehicles, primarily because most newer vehicles have more powerful ignition systems and the vehicle's computer can make adjustments so that vehicle operation seems smoother and more seamless.

Many people think that simply supplying more spark to the firing tip can and will combust more fuel. What they don't understand is that most newer cars' engines are so efficient that they are already burning all of the available fuel. Simply adding more spark voltage can't burn more fuel because there is no more fuel to burn.

When a stock or near-stock engine is given a fresh set of spark plugs, peak efficiency is restored. The power gains that come from this restored state of tune are usually minimal. Any company that tells you that their spark plug will provide significant gains in power in a stock or near-stock engine is making blanket statements that may not be supportable.
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Unread 01-24-2009, 08:12 PM   #7
melloyello
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I was recommending NGK's for their durability and long life, not as a power increase but just a form of preventitive maintenance and a better piece of mind.
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Unread 01-24-2009, 08:14 PM   #8
gatorayde
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Spark plugs are cheap (at least for the 4.0's and going with the tried and true copper cores), swapping them out every 50-60k doesn't cost much so why waste it on NGk's...
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Unread 01-24-2009, 08:24 PM   #9
melloyello
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I don't like to break down, so I run NGK's. Personal preference. Never had one quit b/4 it was scheduled to be replaced.
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Unread 01-24-2009, 08:53 PM   #10
Turbonut
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Quote:
Originally Posted by melloyello View Post
I don't like to break down, so I run NGK's. Personal preference. Never had one quit b/4 it was scheduled to be replaced.
Put a set of NGK Iridiums in or modified RX7 Turbo, but in 670 miles one trailing plug stopped firing. Went back to the factory NGK's and no problems before or after.
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Unread 01-24-2009, 08:55 PM   #11
StrokedWJ
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As others have said, the best and recommended plug for the 4.0 is the cheap base model copper cores. The 4.0L does not benefit from the high end "fancy" plugs. And in some cases the more expensive plugs make 4.0s run like crap.

BTW, your WJ does not use plug wires. They use a distributor less system with a coil pack rail over the plugs.
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Unread 01-24-2009, 09:08 PM   #12
melloyello
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To each his own.
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Unread 01-24-2009, 09:11 PM   #13
gatorayde
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Originally Posted by melloyello View Post
To each his own.
So true about the spark plug topic.
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Unread 01-24-2009, 10:02 PM   #14
comptiger5000
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I've heard many stories about plugs for 4.0s. It seems that some Jeeps like certain plugs better than others.
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Unread 01-25-2009, 08:08 AM   #15
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There are absolutely no absolutes.
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