What brand Ignition Coils for a 2003 Jeep Liberty 3.7

[GitEmSteveDave]

So I got a P0300 code, and after clearing it+adding fuel system cleaner, it's been popping up as "pending" less and less frequently(I use TorquePro and a bluetooth ODB reader to give me live readouts of certain things, like exact coolant temp, but it also will also check every few minutes while connected if there is a pending code, even if it never results in a Check Engine Light and naturally clears). That said, I'd like to at least change the plugs to make sure they are NGK's, but since she's almost 130k, I'd like to think about changing the ignition coils as well. But what brand?! I tried searching the forum, but only saw two recommendations in threads, Mopar and Standard.

I checked RockAuto, and they have MOPAR 56028138AF for $35. But they also have NGK 48651 (#U5053) for $18.

I understand the appeal of going with Mopar, but if I am using NGK plugs, wouldn't using NGK coils be the best option? I would imagine their coils are optimized to go with their plugs and vice-versa. Besides, if I'm not sure that the coils are bad, I would hate to spend $200+ to replace something that is probably working perfectly, but spending ~$100 for NGK Coils and plugs doesn't seem to have the same sting. I only have two days off a week(Mon+Tues) to do things like car repairs, so I'd like to make an order this week so that I can change them next week on my days off.

 

[Billwill]

I am not an expert on these coils as I drive a CRD but from what I have read on all the forums is that NGK plugs properly gapped are a must.

Also the coils need to match the PCM more importantly than matching the plugs.

Coils either work or fail completely....nothing in between. So I would suggest getting the correct NGK plugs first and see how the Jeep performs.:icon_razz:

 

[GitEmSteveDave]

I am not an expert on these coils as I drive a CRD but from what I have read on all the forums is that NGK plugs properly gapped are a must.

Also the coils need to match the PCM more importantly than matching the plugs.

Coils either work or fail completely....nothing in between. So I would suggest getting the correct NGK plugs first and see how the Jeep performs.:icon_razz:

So if the coils either "work or fail", a set of NGK new coils should not hurt her, and if they are shit, it should be obvious on start up.

 

[JasonJ]

So if the coils either "work or fail", a set of NGK new coils should not hurt her, and if they are shit, it should be obvious on start up.

Probably, yes.. or they just won't last as long. Truth be told, I'd be willing to bet a very small sum of money that the OE coils are in fact made by Denso/NGK, albeit probably to different specifications.

That being said, I'd use them. I snagged all 8 coils from my uncles Durango with a 4.7l after he siezed the engine up a few years back. Came off the truck working, so I figure if I ever needed one or a few of them, my chances are good that at least half of those 4.7 coils will work fine, even after sitting in low moisture, low heat storage.

 

[GitEmSteveDave]

Probably, yes.. or they just won't last as long. Truth be told, I'd be willing to bet a very small sum of money that the OE coils are in fact made by Denso/NGK, albeit probably to different specifications.

That being said, I'd use them. I snagged all 8 coils from my uncles Durango with a 4.7l after he siezed the engine up a few years back. Came off the truck working, so I figure if I ever needed one or a few of them, my chances are good that at least half of those 4.7 coils will work fine, even after sitting in low moisture, low heat storage.

I was hoping users here could recommend a coil brand. But, I talked to a friend who works in Toyota Service and he told me Denso=Toyota. So if Jeep is using NGK for it's plugs and sensors, why wouldn't it use them for it's coils? Worse comes to worse, I'll keep the originals and I'll have back ups.

 

[LibertyTC]

I still would have preferred Mopar coils, but here in Canada they were huge$$ for 6.
I did go with Standard coils, and it seemed a bit more peppy with new coil packs.
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I think you would be fine with the Ngk too, more reasonable $.
Have you tired Chevron Techron concentrate-2 bottles in a tank with a good solid hwy drive?

 

[Aceofspades]

First set sucked right out of the boxes. They are house brand. Second set was BWD. Working good so far

 

[JasonJ]

I was hoping users here could recommend a coil brand. But, I talked to a friend who works in Toyota Service and he told me Denso=Toyota. So if Jeep is using NGK for it's plugs and sensors, why wouldn't it use them for it's coils? Worse comes to worse, I'll keep the originals and I'll have back ups.

Nippondenso makes parts for nearly every Japanese brand manufacturer there is, and has since WWII. I think you'll be fine.

 

[J33Pfan]

Change you gas station! It really matters where you get your fuel! 3/4 fill ups at a trusted gas station!

IMO: I would just go with (gapped) NGK copper plugs & Chevr fuel inj cleaner. No coils yet!

 

[GitEmSteveDave]

Change you gas station! It really matters where you get your fuel! 3/4 fill ups at a trusted gas station!

IMO: I would just go with (gapped) NGK copper plugs & Chevr fuel inj cleaner. No coils yet!

This was right after NJ experienced 1-2 months of rain in one day, so I theorize water swamped the lids to the the USTs. Since the initial code, the only other time it came up was a few minutes after a fill up at another station. I have since added in tech-ron and at the last fill up, a bottle of Seafoam. Not even a pending code since then.

 

[GitEmSteveDave]

I still would have preferred Mopar coils, but here in Canada they were huge$$ for 6.
I did go with Standard coils, and it seemed a bit more peppy with new coil packs.
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I think you would be fine with the Ngk too, more reasonable $.
Have you tired Chevron Techron concentrate-2 bottles in a tank with a good solid hwy drive?

I replied to your last post asking which Standard coils those are. I found two listed on RockAuto: Standard UF270($15) and UF270T($10). T's are cheaper and they are described as "a fit whenever a commercially acceptable product is called for." The term "acceptable" worries me. I added a bottle of Techron right after a fill up, and on the next fillup, I threw in a bottle of SeaFoam. I have another bottle of Techron(2 for 1 at Advanced Auto Sale) for when I fill up again.

 

[LibertyTC]

Mine are UF270 and after 2 years so far so good.
I like to use 2 bottles of chevron concentrate into one full tank, and let er rip for a few hours of highway driving, overdrive off up some hills & to the floor..
I saw a small black cloud out of rear view mirror for a second then..
Last post? If you hit the like button that draws my attention, & I will review & reply to the posts better then.

 

[GitEmSteveDave]

Mine are UF270 and after 2 years so far so good.
I like to use 2 bottles of chevron concentrate into one full tank, and let er rip for a few hours of highway driving, overdrive off up some hills & to the floor..
I saw a small black cloud out of rear view mirror for a second then..
Last post? If you hit the like button that draws my attention, & I will review & reply to the posts better then.

Yeah, I think that is part of my problem, on my way back and forth to work, I'm lucky if I hit 60mph for a few solid minutes a day, especially since I'd rather drive windows down vs. AC. I did use two bottles and hit the highway on Easter, but a trip like that won't happen again until Christmas for me. Yeah, it was the post about P0300 code.

The Standards are at the top of my list now. I'm almost tempted to order 3 Standards and 3 NGK's and report back which go bad first, but I'll probably order the NGK plugs and Standard Coils along with some Anti-Sieze and Dielextric grease when my pay check clears tomorrow.

 

[GitEmSteveDave]

Apparently RockAuto doesn't sell anti-seize.

 

[tjkj2002]

Apparently RockAuto doesn't sell anti-seize.

Don't use any,messes with the spark plugs ground.

Don't need and dielectric grease either,okay to put on the sealing o-rings on the coils but that is it.

Can't tell you how many vehicles with misfires where due to over-use of both those products and throw in people using the wrong plugs.

 

[tommudd]

Don't use any,messes with the spark plugs ground.

Don't need and dielectric grease either,okay to put on the sealing o-rings on the coils but that is it.

Can't tell you how many vehicles with misfires where due to over-use of both those products and throw in people using the wrong plugs.

Be surprised how many people argue that you MUST use anti-seize and dialectric grease
Been told many times I'm a stupid F'er for not using it
I'll ruin my vehicle, never be able to remove the plugs ever again:happy175::happy175:

Lets see , 10 times on the 04, on the 03 , its been 4 times, and 05 2 times so far . SO, 16 times at least just on three 3.7s KJs .................none of that stuff

 

[tjkj2002]

Be surprised how many people argue that you MUST use anti-seize and dialectric grease
Been told many times I'm a stupid F'er for not using it
I'll ruin my vehicle, never be able to remove the plugs ever again:happy175::happy175:

Lets see , 10 times on the 04, on the 03 , its been 4 times, and 05 2 times so far . SO, 16 times at least just on three 3.7s KJs .................none of that stuff

Yep.................

Now a GENII 4.7 V8 you need that dielectric grease on the plug boots but that is the only engine I have ever run into that needs either of that crap.

Anti-seize = suspension components

 

[JasonJ]

Be surprised how many people argue that you MUST use anti-seize and dialectric grease
Been told many times I'm a stupid F'er for not using it
I'll ruin my vehicle, never be able to remove the plugs ever again:happy175::happy175:

Lets see , 10 times on the 04, on the 03 , its been 4 times, and 05 2 times so far . SO, 16 times at least just on three 3.7s KJs .................none of that stuff

Also to say that if you changed them at the intervals you're supposed to, they never stay in long enough to seize up to begin with. That's why I hate and never recommend following the 100,000 mile maint. for plugs that GM so often prescribes. Good luck getting those plugs out of those aluminum heads after 8-10 years and 100,000 miles.

Yep.................

Now a GENII 4.7 V8 you need that dielectric grease on the plug boots but that is the only engine I have ever run into that needs either of that crap.

Anti-seize = suspension components

It did help on my Ford 1.9/2.0SEFI engines... moisture would build up sometimes and cause surface corrosion on the contacts in the wires, particularly at the ignition coil. At the spark plug not so much, because they were about 2" away from the exhaust header/turbo manifold (yes, I had <more than one> turbocharged Ford Escort, it's a thing, look it up lol).

 

[GitEmSteveDave]

OK, gonna go with NGK plugs and the Standard UF270 coils, as per LibertyTC's recommendation and they are a "favorite" item on RockAuto. No Anti-sieze, but I will be die-electric greasing them. Also gonna gap them with a wire gapping tool, not the slidey coin one.

 

[tommudd]

OK, gonna go with NGK plugs and the Standard UF270 coils, as per LibertyTC's recommendation and they are a "favorite" item on RockAuto. No Anti-sieze, but I will be die-electric greasing them. Also gonna gap them with a wire gapping tool, not the slidey coin one.

Should come gapped right, mine always do
Rock Auto,..............:emotions34:
Just put a very small amount on the " collar " rubber O ring looking thing, again small amount