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 Post subject: Which spark plugd do people recommend
PostPosted: Wed Apr 12, 2017 5:05 pm 
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im about to change the plugs in my 2004 3.7 liberty and im woundering which spark plugs are the best for these engines,and what most liberty owners like to use.


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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Wed Apr 12, 2017 9:34 pm 
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The ones listed on the emission sticker on the top radiator support(NGK part#).


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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Wed Apr 12, 2017 9:43 pm 
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Iridium spark plugs are the absolute best and longest lasting spark plugs you can buy if you find them for your application. :wink:
Better than Platinum.
Downside; they are not cheap! :roll:

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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Wed Apr 12, 2017 10:22 pm 
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WWDiesel wrote:
Iridium spark plugs are the absolute best and longest lasting spark plugs you can buy if you find them for your application. :wink:
Better than Platinum.
Downside; they are not cheap! :roll:

Do not use platinum or iridium plugs in the 3.7 in a KJ,not designed for said plugs and can and will damage the coils without increasing the change interval.

I see 2-3 vehicles a week that have issues(misfires) after doing a spark plug change using the incorrect plugs for said vehicle.Then the customer get's to pay twice for the same job.


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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Wed Apr 12, 2017 10:30 pm 
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I've heard this before from a handful of experienced mechanics I trust. It seems to have something to do with systems using individual coils per cylinder, but I don't know what the mechanism is causing the damage. Could you expound on that?

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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Wed Apr 12, 2017 11:31 pm 
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GordnadoCRD wrote:
I've heard this before from a handful of experienced mechanics I trust. It seems to have something to do with systems using individual coils per cylinder, but I don't know what the mechanism is causing the damage. Could you expound on that?

The ignition system is designed with a built in resistance factor for proper function.Changing that resistance via spark plugs will burn out the coils.Plus one has to consider heat ranges,the OE spec plug has the correct heat range but that fancy $15 iridium plug that autozone tries to force you to buy will not have the correct heat range,may fit and work but not correctly.

Besides heat range you would need to re-gap the platinum/iridium plugs to get close to the correct copper/nickle plugs that are the correct plugs for the 3.7.

OE copper/nickle - 0.040"
Platinum would need a gap increase to about 0.065"
Iridium would need a gap increase to about 0.085"

But doing that with the incorrect heat range will cause misfire and possible piston damage.


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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Wed Apr 12, 2017 11:34 pm 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
That make sense.
Thank You.

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Sasquatch
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CAT-elimntr
Weeks Stg1&2 EGRfix
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BLING
vent gauges

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head
cams
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Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770


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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Thu Apr 13, 2017 10:29 am 
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tjkj2002 wrote:
Do not use platinum or iridium plugs in the 3.7 in a KJ,not designed for said plugs and can and will damage the coils without increasing the change interval.
I see 2-3 vehicles a week that have issues(misfires) after doing a spark plug change using the incorrect plugs for said vehicle.Then the customer get's to pay twice for the same job.

Did not know this, thanks for the clarification tj. :shock:

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GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount

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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Thu Apr 13, 2017 2:18 pm 
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i hear ngk v power are the best to run is that true.


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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Thu Apr 13, 2017 4:08 pm 
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musky123 wrote:
i hear ngk v power are the best to run is that true.

The part# for those very same plugs is located on the emission sticker on the top radiator support.


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 Post subject: Re: Which spark plugd do people recommend
PostPosted: Sat Apr 15, 2017 6:00 pm 
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