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Old 01-28-2016, 06:17 PM   #1
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Best spark plug ?

Sup guys just changed the cracked manifold and got 8 new MSD coils but the car is still misfiring. In planning on replacing all plugs. What's the best bang for buck for spark plugs? Does the price difference really matter? Just looking to get rid of the misfires . Thanks in advance!


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Old 01-28-2016, 06:38 PM   #2
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Uh-oh, I bet somebody says something about those MSD COP's
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Old 01-28-2016, 06:46 PM   #3
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Old 01-28-2016, 06:48 PM   #4
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I kept my stock coils. Just need some suggestions for plugs


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Old 01-28-2016, 07:24 PM   #5
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I would go with iridium plugs. Last longer and better spark


04 GT
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Old 01-28-2016, 08:36 PM   #6
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Just go with OEM plugs and maybe you misfire might be those msd coils

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Old 01-28-2016, 08:52 PM   #7
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Old 01-28-2016, 09:10 PM   #8
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Quote:
Originally Posted by Bgrimes1 View Post
I would go with iridium plugs. Last longer and better spark


04 GT
Last longer yes, better spark no.

Copper will give you the best spark.


Alecas, just get some copper autolite 104s from Rockauto for $1 each. Change every 30k miles and you can also read coppers when you pull them. Plugs take like an hour max to change anyway on a 2V.
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Old 01-28-2016, 09:34 PM   #9
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Best spark plug ?

Quote:
Originally Posted by scottydsntknow View Post
Last longer yes, better spark no.



Copper will give you the best spark.





Alecas, just get some copper autolite 104s from Rockauto for $1 each. Change every 30k miles and you can also read coppers when you pull them. Plugs take like an hour max to change anyway on a 2V.

Read coppers? I'm good on time just want to do it right. I'm hearing mixed on the whole iridium vs copper vs platinum


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---------- Post added at 11:34 PM ---------- Previous post was at 11:33 PM ----------

Quote:
Originally Posted by jeno View Post
Just go with OEM plugs and maybe you misfire might be those msd coils

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Good one but the misfires were there before I put the new coils in


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Old 01-28-2016, 10:42 PM   #10
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When you put the coils in did you change the coil boots and springs

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Old 01-28-2016, 10:52 PM   #11
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Yea everything new except plugs


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Old 01-28-2016, 11:18 PM   #12
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Go with Autolite 103s 👍

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Old 01-28-2016, 11:20 PM   #13
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103s are one range cooler than stock just FYI.
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Old 01-28-2016, 11:27 PM   #14
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Quote:
Originally Posted by scottydsntknow View Post
103s are one range cooler than stock just FYI.

Copper or platinum?


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Old 01-28-2016, 11:28 PM   #15
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Both. Stock is 104.
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Old 01-28-2016, 11:35 PM   #16
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Also the car hasn't thrown any misfire codes which is why I don't think it's the spark plugs


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Old 01-29-2016, 12:21 AM   #17
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There's a reason they use copper in electrical wires. After it gets out of the smelters and is made into ingots, it is 99.99% pure. This is the same copper that's made into literally everything and virually all alloys use. It's also inexpensive.

The different types of plugs are mostly marketing. Save your money.
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Old 01-29-2016, 12:23 AM   #18
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I use NGK V power, the $20 for 8 ones. I killed 3 Autolite Platinums before changing to the NGK and have not had a single issue since.
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Old 01-29-2016, 12:27 AM   #19
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Best spark plug ?

Is it possible for bad plugs to misfire without throwing any check engine lighter codes ?


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Old 01-29-2016, 01:20 AM   #20
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Yes same for coil packs can have a misfire without codes

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Old 01-29-2016, 01:21 AM   #21
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Had a misfire for a while on mine
without any codes ended up being a bad coilboot

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Old 01-29-2016, 05:55 AM   #22
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i also have the v powers in my car. no complaints. very inexpensive. that would be your bang for your buck. i havent tried the irridiums myself. didnt want to invest higher than 5 bucks a plug for 8 cylinders just to find out if theres a difference. from my understanding of them, the metal just erodes less and lasts longer.
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Old 01-29-2016, 08:22 AM   #23
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Quote:
Originally Posted by scottydsntknow View Post
103s are one range cooler than stock just FYI.
Correct. Doesn't the engine run better with a cooler range?

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Old 01-29-2016, 08:43 AM   #24
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It runs better at what it is spec'd for. It's when you mod it or add boost that you change the heat range usually

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Old 01-29-2016, 09:05 AM   #25
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Right now I'm down to 103s vs ngk v power


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Old 01-29-2016, 09:25 AM   #26
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Just had to replace my intake manifold as well, They used the 104's and my car runs so much smoother and pulls a lot harder now.. All misfires are gone now and just seems to run a lot better..


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Old 01-29-2016, 09:39 AM   #27
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Quote:
Originally Posted by Soccerluvr4 View Post
I use NGK V power, the $20 for 8 ones. I killed 3 Autolite Platinums before changing to the NGK and have not had a single issue since.

Copper?


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Old 01-29-2016, 11:09 AM   #28
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No 103s or ngk v at my local auto parts. I went with 104s


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Old 01-29-2016, 12:19 PM   #29
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Quote:
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No 103s or ngk v at my local auto parts. I went with 104s


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I don't think you'll be disappointed


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Old 01-29-2016, 12:38 PM   #30
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Quote:
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I don't think you'll be disappointed


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Does the fuel rail have to be removed ? Becuase one plug is giving me headache to remove


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Old 01-29-2016, 12:39 PM   #31
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I've been using autolite for literally 15 years in everything I own. Zero issues ever and the price is right, not changing unless they give me a good reason. Going with the $1 per plug coppers for the Steeda as well. All the plat/iridium stuff is gimmicky. It does last longer than copper but you can read copper plugs and plugs on a 2V take an hour to do max. 1 hour and $8 every 30k miles is not an issue. If it is... Lease.

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Old 01-29-2016, 12:45 PM   #32
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Old 01-29-2016, 12:58 PM   #33
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Motorcraft for me. Never had an issue with them. Run Motorcraft in my old 50 pan also. I had a set in the pan for 15 years. That's right, I said 15 yrs, cause every-time I pulled them to check or replace they looked new. So I decided to see how long they would go. Finally changed em just cause. I still carry those in my saddle bags for spares. I know they are gonna work if I have trouble.
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Old 01-29-2016, 01:32 PM   #34
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Always been a motorcraft person. 40k on them still running well. Probably will change them before my smog check

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Old 01-29-2016, 02:16 PM   #35
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Auto lite 104s for $17. Just finished no misfires... For now


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