I was actually getting a few misfires while I was completely stock (just barely enough to notice, but it was there). So these plugs need gapped not matter what...

 

Doing plugs without taking the bumper off?? I call BS!!

I'd like to see a video of that. It's like changing a flat wihout raising a car...good luck

 

+1 lol

If it could be done, and I am not saying it can, you would probably want to commit suicide afterward!

 

why so many have misfire after changing the sparkplugs? Is that wy this job is done correct?

 

There were 2 reasons for the misfires.

1. I gapped the spark plugs wrong since I thought they came pregapped.

2. Two of the ignition coils I got were faulty.

 

I agree with you that this could be to possilbe reasons for misfire but it can be much more.

The more often reason for misfire after sparkplug change is a hair-crack in the porcelain of the spark..

Symtoms: under boost you get misfire, without boost engine runs....if you have a broken porcelain you will get more constant misfire

If you hurry at this job, it could be possible you bent the spark plug with the tools.

This is wy I say dont`t hurry at this job, take your time. Make space around the sparkplug area. (Bumper, IC) This takes only a little time.

I tested many brands of sparks and I never had a misfire with a beru,bosch,ngk,denso. Of corse it have different designs of electrode,material(platin,iridium,copper,silver) and one of these could work a little better...but it works without misfire.

I only like to give a possible failure not more......and if you have misfire before you change your plugs ....you have to check more and have more possible failures to check

 

I don't think rushing the job was the problem... First time took forever and was bad plugs / incorrect gap, etc.

I had it down to 2.5 hours and that was not rushing, it was just being prepared and knowing every bolt that needed to be removed and how everything was put together, etc... Plus that round fixed the problems...

I know what you are saying, but that is totally not the case... I was very careful and meticulous about everything I did. I just assumed the plugs were made for this car since they listed it as a fit... But I guess they may work if they are gapped differently then they came...

 

i understand.....do you have a special tool used to adjust the gap? if you don`t have it avialable you can produce a failure on the electrode side (porcelain ...on electrode side)

if the coils have rust on the ironcore.... it could be a failure source....

again i dont like to give you a advice i only like to help so i can....

 

I don't have anywhere near the experience of JustinN but I do have enough to know that NGK is the best and most affordable brand hands down. From the $2 copper plugs ran in my old Honda to the same ones in my Supra that made way more power. NGK has never let me down.

After playing with my AEM on my Supra and running great around 850whp it was having some kind of electrical issue which we traced back to running NGK plugs of the NON-RESISTOR type which was causing too much electrical interference. I switched to NGK IRIDIUM plugs out of neccessity as they were the only resistor style plug that was in a 9 heat range (colder plug). Those dam things lasted forever on pump gas and race gas.

So when I did the plugs on my Porsche, I used the NGK iridiums in the stock heat range and I think the stock gap was .3 or .32 so I didn't bother gapping them but it certainly is possible just be careful. I'm using the same K16 EPL flash with no issues or misfires. I'm going to some GT28's soon and I'll probably end of swapping the plugs for one heat range colder of the same NGK Iridiums just to be on the safe side.

 

Denso's are a very good plug and have shown to give a hp increase over standard copper. The one problem with the plug is they are fragile. The tip won't take any detonation, it will shatter. A lot of Ford Lightning guys run this plug and experience the same problem. A couple ticks of detonation and you're replacing plugs.

 

Both my car and Powell's car are running NGK Iridium one heat range colder than stock. I have at least 6k miles on my plugs without so much as one plug misfire.

Tony at EPL had no problems tuning Powell's car initially on the NGK 7s, and I haven't had a problem on his, or mine with the VPRO installed. Same plugs

Justin

 

I prefer the flux capacitor deluxes for my pre-igniter,the double back whoosh bite is incredible.

 

Justin are you guys running the BKR7EIX straight out of the box (.032" gap)? (after checking them of course)

 

Must be a Texas only part...

 

I pinch mine down to .025.