Iridium spark plugs are the absolute best and longest lasting spark plugs you can buy if you find them for your application.
Better than Platinum.
Downside; they are not cheap!
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| Which spark plugd do people recommend http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=3&t=86438 |
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| Author: | musky123 [ Wed Apr 12, 2017 5:05 pm ] |
| Post subject: | Which spark plugd do people recommend |
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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| Author: | tjkj2002 [ Wed Apr 12, 2017 9:34 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
The ones listed on the emission sticker on the top radiator support(NGK part#). |
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| Author: | WWDiesel [ Wed Apr 12, 2017 9:43 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
Iridium spark plugs are the absolute best and longest lasting spark plugs you can buy if you find them for your application. Better than Platinum. Downside; they are not cheap!
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| Author: | tjkj2002 [ Wed Apr 12, 2017 10:22 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
WWDiesel wrote: Iridium spark plugs are the absolute best and longest lasting spark plugs you can buy if you find them for your application. Better than Platinum. Downside; they are not cheap! 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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| Author: | GordnadoCRD [ Wed Apr 12, 2017 10:30 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
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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| Author: | tjkj2002 [ Wed Apr 12, 2017 11:31 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
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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| Author: | GordnadoCRD [ Wed Apr 12, 2017 11:34 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
That make sense. Thank You. |
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| Author: | WWDiesel [ Thu Apr 13, 2017 10:29 am ] |
| Post subject: | Re: Which spark plugd do people recommend |
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. 
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| Author: | musky123 [ Thu Apr 13, 2017 2:18 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
i hear ngk v power are the best to run is that true. |
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| Author: | tjkj2002 [ Thu Apr 13, 2017 4:08 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
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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| Author: | tommudd [ Sat Apr 15, 2017 6:00 pm ] |
| Post subject: | Re: Which spark plugd do people recommend |
No one ever opens their hood and actually looks what there |
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