Sparkplug Gurus

[Pal]

hey guys,

done a spark plug change before my tune on monday and found number 3 cylinder plug is alot more carboned up that the rest

idle has been a little rough, thinking maybe a bad flowing injector??

any comments appreciated (hopefully not to bad)

[Dobz]

You just answered your own question. Getting them flow tested will confirm.

What ecu are you running?

Edited August 11, 2011 by Dobz

[Pal]

pfc,

i got a idea that its the injectors but there are alot more knowledgeable people on this site

[Dale FZ1]

1. compression check

2. inspect coolant

3. consider lifting out the fuel rail and visual inspection of the tips. It would be odd to find only one affected by carbon buildup.

[GTSBoy]

That coil could be a little soft too. Less likely that the injector, but possible.

[Pal]

Had a talk with my tuner today and going to pull my injectors and get them cleaned and flow tested. If that doesn't work, them compression test, injectors are 15 years old now so won't hurt anyway

[MrStabby]

Had a talk with my tuner today and going to pull my injectors and get them cleaned and flow tested. If that doesn't work, them compression test, injectors are 15 years old now so won't hurt anyway

Check the AFRs again after they've been cleaned - you may have another 25% flow!

[Pal]

Good idea, the car will go back on the dyno after this anyway

[defari]

my 25det had 2 out of the 6 slightly more carbon-ed up - i put it down to those 2 coils failing as they are starting to get a small hairline crack..

[Pal]

Had injectors cleaned and flow tested today. No 3 came back as flowing 10 percent more at idle than the other five.

Now looking for a new set of injectors. Anyone know of a good place to buy them. After 550cc

[MrStabby]

Had injectors cleaned and flow tested today. No 3 came back as flowing 10 percent more at idle than the other five.

Now looking for a new set of injectors. Anyone know of a good place to buy them. After 550cc

Hehe - so you're not going to put the highflow injector in no. 6?

IIRC the pfc can trim pulse width per injector and some ppl use that to bump up the duty on no. 6 which leans out a bit because the plenum shape encourages higher flow on that cylinder.

Maybe all this is a bit too much of a hack tho - 10% is a lot.

[STATUS]

Had injectors cleaned and flow tested today. No 3 came back as flowing 10 percent more at idle than the other five.

Now looking for a new set of injectors. Anyone know of a good place to buy them. After 550cc

seriously put in ID1000's, probably run better than most 555cc injectors out there and gives you scope to run E85 or any other myriad of fuels.

[Pal]

Don't have e85 in WA, and probably never will, cars still got standard turbos and not going to upgrade for a long time. Got my tuner lookng for a set of 650 or 750 cc injectors