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Old 10-02-2010, 11:28 PM
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Getting to spark plugs in hemi

The manual says that on the V8, you need to replace the spark plugs every two years. Anyone take a peak yet to see how difficult that is to do yourself? How much disassembly is required?
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Old 10-03-2010, 10:53 AM
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Re: Getting to spark plugs in hemi

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Originally Posted by rdalcanto View Post
The manual says that on the V8, you need to replace the spark plugs every two years. Anyone take a peak yet to see how difficult that is to do yourself? How much disassembly is required?
Every 2 years. I'm used to my tahoes and 100k. Is thus vehicle going to cost more for maintenance? 2 years without support of mileage doesn't seem right.
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Old 10-03-2010, 11:17 AM
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Re: Getting to spark plugs in hemi

$40 every two years! OH NO!!

seriously though i'm sure i'd be fine up to 40,000miles.
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Old 10-03-2010, 11:31 AM
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Re: Getting to spark plugs in hemi

I just replaced my spark plugs on my 05' WK 5.7L in April and I definitely know that they haven't been replaced.
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Old 10-03-2010, 11:33 AM
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Re: Getting to spark plugs in hemi

that is what the manual says. I am wondering if this is because of the switch from 8 to 4 cylinders that occurs in eco mode.
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Old 10-03-2010, 01:02 PM
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Re: Getting to spark plugs in hemi

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Originally Posted by wk2silverbullet View Post
that is what the manual says. I am wondering if this is because of the switch from 8 to 4 cylinders that occurs in eco mode.
I'm thinking that must be it, because on the 6 cyclinder the manual recommends replacement at 6 years I think (can't remember the mileage)
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Old 10-03-2010, 01:18 PM
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Re: Getting to spark plugs in hemi

If you are talking about the engines with copper plugs then yeah they recommend a replacement every 30k miles because they are regular champion or bosch copper plugs. However, at the 33k mile mark or so I ended up getting the champion platinum power plugs number 3340 that are virtually identical to the oem copper ones, but platinum, and this way I wont think about replacing them until i have 130k on the clock. I will also say my performance and gas mileage did not improve nor did it decline with these plugs. They just work with zero issues. I now have almost 55k on the jeep. There are however some peeps that are very particular about using oem plugs even if it is copper. Either way I feel you cant go wrong. I have a 4.7L but if you hemi people want to get platinum replacements just make sure you get the same brand and same spec plug in a platinum variant.
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Old 10-03-2010, 03:08 PM
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Usually the rational behind having a time limit of 2 years is not that they wear out but that it's a good idea to remove them thY often because with all he heat/cold cycles they can end up seizing up in there and you might not get them out without screwing up the threads and dropping some serious change to have that fixed. If you really want you can just remove and replace to prevent problems. But if you are going through the effort to get at them you might As well replace them.
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Old 10-03-2010, 06:04 PM
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Re: Getting to spark plugs in hemi

The Champion Double Platinum plugs have a 5 year unlimited mileage warranty. The OE plugs are Copper Core to keep the price down. Unfortunately, they require replacing before 36,000 miles.
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Old 10-03-2010, 06:33 PM
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Re: Getting to spark plugs in hemi

The OEM copper ones need replacing every 30K miles regardless of what engine they are in. I have a 3.7 Laredo and a 5.7 Hemi and both manuals state every 30K.
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Old 10-03-2010, 07:52 PM
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Re: Getting to spark plugs in hemi

The 3.6L comes with 100k plugs, but the 5.7 comes with 30k plugs. I haven't changed them, but my dad said having the work done on his '05 Ram was no picnic. It didn't have MDS, but he chose not to do the work himself to save a bit of headache. He said you can't get at the plugs for the back 4 cylinders easily - maybe he said the manifold had to be removed? I can't remember exactly. But I'm not looking forward to it. Changing them on the 3.7L in my KJ took about 45 minutes.
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Old 10-03-2010, 07:59 PM
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Re: Getting to spark plugs in hemi

I did my spark plugs by myself. It took me about 1 hour with the right set of tools. It's a pain to get the Spark Plugs in the back. Just take your time. I'm going to try and replace them every 20k-30k. I might try the NGK Plugs next time.
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