release2063

i put the ngk iridium lasar spark plugs in my car and its missing a little but the timing sounds wrong because i put a mmw header hks titanium axle back and an injen cai just wondering if i need to go get that reset and what could make my car respond beter to throttle response

engifineer

First, I would upgrade back to the original plugs. I wouldnt trade the denso iridiums for anything. There is no reason to change the plugs on this car unless you are going a step colder for forced induction.

If it missing after changing the plugs, you probably need to take them out and gap them according to spec. You may not have them gapped correctly.

nodsetse

Agree 100%, FWIW.

MJVsTC

"Upgrading to OEM".

That sounds funny.

engifineer

Not when OEM is Denso Iridium plugs..

MJVsTC

I realize that.

It's just a welcome change that OEM is better than A/M for once. That's all.

engifineer

No kidding, I totally agree. It is nice to see manufacturers using top of the line parts once in a while!

toyota_scion_tc

I put ngk iridium's in mine and have no problems. I have had bad experiences with denso plugs b/c I drive my car really hard I believe they fouled out too early. I am not talking about the ones in the tc but it was another car I had heavily modded. Once I found out the tc's have denso I had to get rid of them. I am not saying everyone will have bad experience but I have with denso. I have never had one issue with ngk plugs.

engifineer

ngk's are good plugs.. but still well beneath denso in my opinion. If yours fouled out, it was due to a poor setup or the wrong type of plug most likely. On a heavilly modded car the most common issue would be an overly rich mixture or an ignition under voltage issue, not poor quality plugs. I have never heard of an issue with denso plugs other than people not liking to have to pay the price to replace them. You had one bad experience with a set which was most likely not related to the quality of the plug. Were they oil fouled or carbon fouled?

In either case, I would not replace denso plugs with ngk, even though I think ngk are a good quality plug.

tcengel

The problem with Iridium plugs is that they "blow out" from high boost pressure. On a naturally aspirated car, they are fine.

Also, you should not gap Iridium plugs, you need to buy them with the correct gap. Again, only if you are boosting and you need to close the gap to keep them from blowing out.

xXitsmechrisXx

I have some knowledge about spark plugs. But I was wondering which NGK spark plug is better?

1. Iridium spark plugs
2. IX iridium spark plugs

Scotty

i kno that if ur FI u should get a step colder plug but wat would be a good plug for to go with i was thinkin about changing them today while i had some time....

jen23tc

what is the proper gap for the NGK iridiums with FI?

release2063

just run the nology silver plugs they work a hell of alot better and if you have to you can gap them, gap is .041

falkor

Iridium is better than the IX series . As for NGK vs Denso . Ouch ! Both are good but , opinions aside , the NGK will work longer , on average , due to a 0.7 gap . Denso have a 0.4 , making them more prone to fouling . Both are quality . NGK should last longer . Outside of that , they are the same . Only run cold plugs on heavily modded cars . For everyday driving , hotter is better .

Scotty

so does anyone kno wat a stage colder from stock plug would be if i were goin with NGK brand plugs...im not very knoledgeable with spark plugs i kno wat they do but i dont kno what kind is better then which...i went to my local store to pick up new ones and i told the guy i needed a step colder then wat i already had (stock)...and he diddnt understand wat that meant so i just ended up leaving and now im tring to fig out which plug i exactly need to ask for.