Spark plugs from Amazon

[TGGT]

Anyone else running spark plugs purchased from Amazon? I’m on my second set, and while my car runs relatively good, I’ve been chasing a intermittent misfire above 7k for some time. I went out last weekend to do some freeway pulls and In 5th and 6th gear above 7k I’m getting a flashing cel and my logs are showing 3-10 positive knock. I’ve been going over everything trying to figure this out. I’ve even had the plugs out a couple of different times to check gap ( .020 ) and to make sure they weren’t cracked. Then for some reason there was a voice in my head that said: maybe the plugs are counterfeits. Anyway, I’ve been doing some research and seems like some of the ngk plugs purchased from Amazon are indeed counterfeit. I can’t say for certain mine are or that they are for sure the cause of my misfire/knock problems, but I think I will be replacing them just the same. Anyone else have any experience with potentially counterfeit plugs?

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[3beeps]

My NGK 6510 plugs were purchased Oct 17 2020 on Amazon. No missing issues, gapped to .024.

 

[TGGT]

Good to know. Thanks for the feedback

 

[TGGT]

On a side note. The ones I purchased were sold by another vendor, but fulfilled through Amazon. The reviews for the particular plugs I purchased allege that they are counterfeit and one reviewer sited that the box said assembled in Thailand. But it does appear that genuine ngk’s are available on Amazon as well

 

[Jackson1320]

I have had problems with Amazon plugs being damaged but not counterfeit. At least not that I know of.

 

[TGGT]

I just went and bought replacement plugs from o’reiley and they are identical to what I have in the car. The boxes also say assembled in Thailand. I don’t know at this point. Perhaps I got some legit ngk’s from Amazon. If that’s the case it leaves me still chasing a misfire above 7k and only in gears 5&6

 

[Jackson1320]

I just went and bought replacement plugs from o’reiley and they are identical to what I have in the car. The boxes also say assembled in Thailand. I don’t know at this point. Perhaps I got some legit ngk’s from Amazon. If that’s the case it leaves me still chasing a misfire above 7k and only in gears 5&6

Increase the dwell time 5% and see if it goes away. Maybe one of the coils can’t keep up

 

[Jackson1320]

I just went and bought replacement plugs from o’reiley and they are identical to what I have in the car. The boxes also say assembled in Thailand. I don’t know at this point. Perhaps I got some legit ngk’s from Amazon. If that’s the case it leaves me still chasing a misfire above 7k and only in gears 5&6

Auto or stick?

 

[TGGT]

Auto or stick?

Auto. Good tip on the dwell time. I hadn’t even considered it

 

[TGGT]

Haven’t had a chance to play with the coil dwell time yet, but I have created a tune where I added %5. I do wonder if it will actually do anything. I think that the coils will only saturate so much, but it’s worth a shot. I was comparing various tunes from gen2 cars and I noticed that the dwell time is much longer on those cars. Perhaps those coils are much different. I was tempted to just use the data from the gen2 coils ,but I’m also concerned that it could shorten the life of the coil or have other negative effects. I think the next chance I have I’ll log a couple of pulls with the %5 increase in dwell time. I also installed new plugs gapped at .028

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