Spark Plugs for 4G63T? [Merged 12-28-2021]

[TsiRacer93]

yea so my cars got like 100,000 miles on it, what are some good plugs to be using? i was thinkin bosh 4s but someone told me they would be bad for my car..

 

[steve]

Sounds like you told the counter guys what car you had and they gave you the BPR6EKN dual electrode plugs that were OEM in 2G's rather than the single electrode BPR6ES.

Steve

 

[AWDrift]

Last time I went to NAPA they gave me different ngk plugs for my 2g, bpr6ekn. They said that they were the ones listed for the second generation cars, and the first gens had the bpr6es plugs. The bpr6ekn ones are "multi-ground plugs" (two tips), that might be what you have.

They didn't have any of the bpr6es in stock so I'm running the multi-ground plugs on my car for now. They work fine around stock boost, not sure about beyond 15psi or so.

Check if they are bpr6es or pbr6ekn.

EDIT: ^^^^beat me to it

 

[97spyder maayng]

"A spark plug's voltage requirement is directly proportionate to the gap size. The larger the gap, the more voltage is needed to bridge the gap. Most experienced tuners know that opening gaps up to present a larger spark to the air/fuel mixture maximizes burn efficiency. It is for this reason that most racers add high power ignition systems. The added power allows them to open the gap yet still provide a strong spark."

http://www.ngksparkplugs.com/techinfo/spark_plugs/installation.asp?nav=31300&country=US#gapping

Thought this may aid the gapping part. NGK's 2cents.

 

[punishercb]

Sounds like you told the counter guys what car you had and they gave you the BPR6EKN dual electrode plugs that were OEM in 2G's rather than the single electrode BPR6ES.

Steve

Yeah....that would be it. I feel stupid. Well, since I have them, will the work fine?

 

[steve]

Yes, they will work. Just twice as much work to gap them. Check the link above to see if they tell you the correct procedure for those plugs. IIRC, Mitsubishi used those to help cure some of the random idle misses we seem to get.

Steve

 

[punishercb]

alrighty, thanks. I checked them all(all eight.) and they're fine. all within .028-.032.

 

[Defiant]

"A spark plug's voltage requirement is directly proportionate to the gap size. The larger the gap, the more voltage is needed to bridge the gap. Most experienced tuners know that opening gaps up to present a larger spark to the air/fuel mixture maximizes burn efficiency. It is for this reason that most racers add high power ignition systems. The added power allows them to open the gap yet still provide a strong spark."

http://www.ngksparkplugs.com/techinfo/spark_plugs/installation.asp?nav=31300&country=US#gapping

Thought this may aid the gapping part. NGK's 2cents.

Some of this changes with supercharging. It's referred to as spark "blowout", although it's probably the effect of more air molecules in the gap being a stronger dielectric. Lack of spark is not one of the maladies affecting DSMs.

 

[ETalon95]

I am having some hesitation when I get up to about 70-80mph, so I bought new NGK plugs and wires today, the NGK ones are supposedly the OE type, but they have 2 prongs on them (for more spark) do those seem to be the correct ones to put in? b/c the hesitation is still there and the CEL is on now. Anyone know what the problem could be?

 

[eclipseGSTud]

I am having some hesitation when I get up to about 70-80mph, so I bought new NGK plugs and wires today, the NGK ones are supposedly the OE type, but they have 2 prongs on them (for more spark) do those seem to be the correct ones to put in? b/c the hesitation is still there and the CEL is on now. Anyone know what the problem could be?

Did you gap the spark plugs before you put them in? The ngk's with the 2 prongs are the factory stock ones. Use ngk bpr6es spark plugs, or ngk bpr7es. Didn't check your profile, but if your car is mostly stock then use bpr6es. You can use the ones with the 2 prongs, but can you tell us the # that is listed on the box to make sure. Do you have anything to read what the CEL is? If not then go to an auto parts store (e.g., Kragen) to have them check for you. The CEL could be many things such as a misfire.

 

[ETalon95]

I'm going to take to the auto shop tomorrow when I get a chance as far as the model number it is BPR6EKN and what would cause the misfire?

 

[ACKERSON]

Those are multi-ground plugs and they will NOT work correctly in your engine. They were designed for rotary engine applications. Stock replacements for 4g63 turbo engines are BPR6ES, make sure you gap them correctly, .028"-.032" depending on your boost level

 

[GST_97]

Ackerson, actually, the BPR6EKN is the Mitsu factory spark plug for the 2G. They work just fine. I used them up until about a year ago when I switched to 7ES's.
Truly, I never even had problems running 22PSI on the BPR6EKN's, just kinda pricey.

Etalon... first thing, get the CEL code read. It will at least tell you the area to start looking in. You could have messed a wire up (not likely, but possible).
It is also possible you have a boost leak, a dying coil, or any of many possibilities causing a hesitation. Is the hesitation totally speed related or is it RPM or throttle position or boost related?

Also, what did the plugs that you took out look like? nice and tan? or black with soot? or white with speckles?


-Chris

 

[ETalon95]

The plugs taken out were black with soot

 

[ACKERSON]

That's weird I remember using them in rotary engines back in the day. I thought that since the electrodes were on side of the center electrode it tends to give you a pretty crappy spark at higher boost levels. My mistake

 

[ETalon95]

Ok I was told that my gap is now messed up and thats why my CEL is on... so what do I do take them back to the auto store and tell them they gave me the wrong ones... or are the double prong ones fine?

 

[Gleason]

if your gap is messed up, take them out ASAP

double pronged are harder to gap, and if you don't, you can end up with an incorrect gap.

just get single pronged [ bpr6es etc] . they are cheaper, and alot easier to correctly gap.

 

[ETalon95]

The double pronged ones are allready gapped... I'm just asking if if the wrong gap would trigger the CEL

 

[Defiant]

No, nothing to do with spark plug gap can trigger a CEL.

 

[Defiant]

That's weird I remember using them in rotary engines back in the day. I thought that since the electrodes were on side of the center electrode it tends to give you a pretty crappy spark at higher boost levels. My mistake

I think the rotary plugs were three-prong, or just straight surface-gap (no "prongs").
Your owner's manual specifies the double-electrode plug.

 

[Gleason]

if you want to pull the ECU code, go to an Autozone and have them pull it.

 

[DSMstatus]

.28 gap

 

[Jackripper_83]

Buy a manual, end of story.

 

[TSiWarrior]

I normally would just post "RTFM", but im shure a 1 word post would get more of my rep points taken away. I'm already -3 becuase I made fun of a honda. I'd say google it, or stop by one of the chatrooms and see if anyone has any input.

 

[Strm Trpr]

Well... either way, u still need units...
Nevertheless, 4G63's use a gap of .028" of an inch.

 

[Ho0ked]

Looked everywhere, no info..........

Mods in profile, what plugs/wires should I be running atm ?


Getting
EvoIII 16g fully porting
Fmic
550's
255 Fp
FPR
plan to run around 20 lbs daily
daily driver

What plugs wires for this settup ?


Thanks for any suggestions