Spark Plugs Keep Fouling, Why?

[Turbz RB-25]

Hi Fellas,

I was recently having a few issues with my car with low power output. However, I change the spark plugs (Put NGK platinum ones) and the power was back up (wheels spings in 3rd gear )

Anyway, 3 weeks of driving, the power is back down, had a look at the spark plugs, and they are fouled, yet again...

I cant keep forking out $150 every 3 weeks to change the spark plugs, so what do you guys suggest?

I have a built rb25/30 block, forged pistons, rods, the whole shabang. GT35r turbo, Autronic SM4.

Went to the tuner last week, AFR were perfect throughout so I am not too sure whats causing the fouling? Will I need to get hotter plugs? I am currently running the NGK PFR6G-11 5555 at 0.8 gap.

Not sure what heat rating these are.

Any suggestions are welcome.

CHeers fellas.

[Adriano]

Stop putting $150 plugs in, they dont help. Either it is running too rich, which could be too much cold start enrichment, accell enrichment, or you have a weak spark.

[StealthX]

Do you have any rich spots in your tune, even small events? i.e. just coming onto boost, or injection cut on deceleration?

Are you getting any misfires, especially on boost?

as i understand it, plugs foul cos of rich condition and/or lack of spark (not igniting the mix)

maybe something to do with the gap?

with 22psi (going by whats in your sig) you might need a colder plug. most people run 6s on stock engines/lower boost.

what did your tuner have to say?

good luck bro

[Adriano]

colder plug would only make the problem worse

[joeyjoejoejuniorshabadoo]

what kind of driving do you do?

constant short trips (5mins or so to work i the morning) when the car is cold and not hitting boost can foul plugs pretty easily...

if this is the case take it out for a nice longer drive and boost it a bit... it should clear up.

otherwise, look at your tune again... most likely too much fuel somewhere.

plugs to use would be bcpr7es @ 0.8

[GTScotT]

WB o2 and drive it around.

i bet the problem is at idle and low speed driving being too rich rather than WOT

[joeyjoejoejuniorshabadoo]

+1....

[STATUS]

Guarantee the tune is way to rich on transitions and cold start driving.

[R31Nismoid]

I thought people were knowledgeable enough not to STOP using Plati plugs?

Coppers all the way.

[joeyjoejoejuniorshabadoo]

Guarantee the tune is way to rich on transitions and cold start driving.

you got a pm trent

[WARLORD]

Guarantee the tune is way to rich on transitions and cold start driving.

++1

[EFI Performance]

Check to see if injector over-run is tuned off on decel

Sm4 Autronic, wicked ECU with great injector control.

[STATUS]

Check to see if injector over-run is tuned off on decel

Sm4 Autronic, wicked ECU with great injector control.

is too

[Turbz RB-25]

I thought people were knowledgeable enough not to STOP using Plati plugs?

Coppers all the way.

Sorry mate, you contradicted yourself there.... Not to stop or to stop?

[joeyjoejoejuniorshabadoo]

i think he meant to say NOW to stop...

ash HATES iridium plugs.... as do i

[PM-R33]

Coppers for the win.

[TiTAN]

BCPR7ES plugs here (near identical engine setup) sub $30 for 6 plugs, just check them at each service it is only a 10-20 min job.

[Turbz RB-25]

what kind of driving do you do?

constant short trips (5mins or so to work i the morning) when the car is cold and not hitting boost can foul plugs pretty easily...

if this is the case take it out for a nice longer drive and boost it a bit... it should clear up.

otherwise, look at your tune again... most likely too much fuel somewhere.

plugs to use would be bcpr7es @ 0.8

Pretty much 5-10 min drives to work and back each day, car doesn't even get a chance to fully warm up.

As for these bcpr7es, what heat range should I get?

How long do these spark plugs generally last?

I wouldn't mind changing them once a month, anymore than that gets annoying....

Thanks for the input

[STATUS]

Pretty much 5-10 min drives to work and back each day, car doesn't even get a chance to fully warm up.

As for these bcpr7es, what heat range should I get?

How long do these spark plugs generally last?

I wouldn't mind changing them once a month, anymore than that gets annoying....

Thanks for the input

Theres your answer, you need to trim the temp compensation.

bcpr7es, usually 7-12 months depending on driving Kms.

[joeyjoejoejuniorshabadoo]

the 7 in the number IS the heat range

mine last 20,000ish with 300rwkw

if your car is always on cold start / idle then try giving it a good run and boosting it for a while and see if the plugs clean up a bit.

if they do then you know which part of your tune has too much fuel