[winjury]

So sense I have had all the mods done below, and been tuned multiple times over by Ken at Wedge Performance, we cant seem to get the plugs right! I have replaced them about every 300 miles due to misfires created by the plugs gap changing. It gets really annoying. I keep bringing this up to Ken and Steve (the NGK 97506 was their recommendation for my mods) and they dont seem to have an answer. They are also gapped to .20.
The misfire is always felt then the plugs are on their way out at higher rpms. I need another tried and true solution to what plug and gap I should be running. It is worth noting that I run 100% e85 (which is colder) then 93 octane fuel. Maybe I should try 95770? And also I am well over 400whp maybe i need a better solution then OEM coils?
I have checked the other threads and I havent quite found what I am looking for. Any help would be great.
thanks.

[dpaul]

Originally Posted by winjury

So sense I have had all the mods done below, and been tuned multiple times over by Ken at Wedge Performance, we cant seem to get the plugs right! I have replaced them about every 300 miles due to misfires created by the plugs gap changing. It gets really annoying. I keep bringing this up to Ken and Steve (the NGK 97506 was their recommendation for my mods) and they dont seem to have an answer. They are also gapped to .20.
The misfire is always felt then the plugs are on their way out at higher rpms. I need another tried and true solution to what plug and gap I should be running. It is worth noting that I run 100% e85 (which is colder) then 93 octane fuel. Maybe I should try 95770? And also I am well over 400whp maybe i need a better solution then OEM coils?
I have checked the other threads and I havent quite found what I am looking for. Any help would be great.
thanks.

Where did you buy the plugs? If you're not aware, they are being counterfeited.
https://f80.bimmerpost.com/forums/sh....php?t=1468550

[mweisdorfer]

Get Eldor Coils & maybe NKG 95770 happen at .018.

I thought NGK 97506 was supposed to be gapped at .022 ????

[TunafishE93]

How much of a gap are they changing in the 300 miles? I have seen the 97506 recommended from .025 to .018.

[winjury]

Originally Posted by dpaul

Where did you buy the plugs? If you're not aware, they are being counterfeited.
https://f80.bimmerpost.com/forums/sh....php?t=1468550

Wow that's crazy! No I have been buying them from fcp euro

[winjury]

Originally Posted by TunafishE93

How much of a gap are they changing in the 300 miles? I have seen the 97506 recommended from .025 to .018.

Some literally sitting on the ground strap. Others around .005-.010

[winjury]

Originally Posted by mweisdorfer

Get Eldor Coils & maybe NKG 95770 happen at .018.

I thought NGK 97506 was supposed to be gapped at .022 ????

So are these aftermarket coils any good? I have been told stick to stock... but I could be wrong

[dpaul]

Originally Posted by winjury

Some literally sitting on the ground strap. Others around .005-.010

Coils, or choosing a suboptimal initial gap, cannot possible be the cause of this problem. I do not recall hearing about anything resembling this on an N54. There are just not many ways for a spark plug gap to close up as you describe. I think you have bigger problems than the plugs themselves.

Detonation, water or too much fuel in cylinder, foreign object in cylinder, carbon build up on piston top, that sort of thing. All pretty bad and most would be expected to result in driveability issues and/or error codes of one sort or another, which you don't report.

It sounds like you've replaced these plugs more than one time. Is that the case? If so, are all the plugs affected or just particular cylinders? Have you tried running with the stock plugs?

[winjury]

Originally Posted by dpaul

Coils, or choosing a suboptimal initial gap, cannot possible be the cause of this problem. I do not recall hearing about anything resembling this on an N54. There are just not many ways for a spark plug gap to close up as you describe. I think you have bigger problems than the plugs themselves.

Detonation, water or too much fuel in cylinder, foreign object in cylinder, carbon build up on piston top, that sort of thing. All pretty bad and most would be expected to result in driveability issues and/or error codes of one sort or another, which you don't report.

It sounds like you've replaced these plugs more than one time. Is that the case? If so, are all the plugs affected or just particular cylinders? Have you tried running with the stock plugs?

No error codes, had the walnut blast 2 months ago, leak down and compression test has been done. No other issues found thus far

[mweisdorfer]

Originally Posted by winjury

So are these aftermarket coils any good? I have been told stick to stock... but I could be wrong

Eldor Coils are the best money can buy unless you go with a higher voltage type coil.

Get them from FCP & replace them for free every 50,000 miles or so.

[TunafishE93]

Yeah plugs gap closing is not good. Has the block been rebuilt, maybe deck/head has been planned? Did you get any debris in cylinders when walnut blasting? Do you have major pre-ignition? Running meth (water logging)? You see any damage to the ground straps? I read that the plugs center pin can come loose causing it to closing the but wouldn't see that happening very often...

[dpaul]

Originally Posted by winjury

No error codes, had the walnut blast 2 months ago, leak down and compression test has been done. No other issues found thus far

OK, are all cylinders are affected? If it was a subset, was it the same subset with the second and subsequent sets of plugs (your first post implies multiple changes)?

[ricx]

Simply put in another’ brand gapped the same. If the same thing happens you know it’s not the plugs but the engine.

[winjury]

Originally Posted by dpaul

OK, are all cylinders are affected? If it was a subset, was it the same subset with the second and subsequent sets of plugs (your first post implies multiple changes)?

It was only once we found 2 plugs with zero gap . They have been changed a total of 3 times.
We may have figured out the problem- I will fill your in once we give it a run for a few days then I'll let the community know.

[feuer]

Originally Posted by winjury

It was only once we found 2 plugs with zero gap . They have been changed a total of 3 times.
We may have figured out the problem- I will fill your in once we give it a run for a few days then I'll let the community know.

How are you installing these? Just dropping them in? Is possible gap closed during installation.

[winjury]

Ok, as i said i would update everyone I just needed a descent amount of time to test and make sure the issue is in fact resolved.

The problem was...... Traction Control, 100%. lol

So it turns out my vehicle , which has nearly new tires (8/32 all the way around), was loosing traction and it was cutting back so bad it was eventually causing a miss. No idea how the ground was on the electrode, but the misfire and plug issue has not happened sense and its been about 10,000 miles along with showing a Hellcat I can walk away from him. lol
So i guess what everyone else can take from this is if you follow my mod list, if you accelerate turn off the traction control completely.