#3 plug keeps fouling out

[godzillarb]

First of all I have an RB26dett

I was at the track today and made a couple ok passes, on one pass I missed 3rd and hit the rev limiter. Couple passed later I'm in 2nd at about 7,800 and go to shift into 3rd when I have absolutely no power. I though I had blown an IC pipe but everything was intact.

Ok, so I pull the plugs and #3 is really fouled and #4 is on its way...the rest are fine. I throw a new set in and head home, as soon as get into it a little (5,500 rpm or so) the car starts missing again. After limping home I pull the plugs again and all are completely clean besides #3 which is fouled pretty good.

I'm thinking it's either a bad injector or a bad coil... thoughts?

[Chrischeezer]

check the o ring on the injector..

[Blackparade]

Swap coils around, see if the problem moves with the coil. What intake manifold are you running? Try that and let us know.

[godzillarb]

I'll try the swapping coil thing tomorrow...isn't there a way to use a volt meter to test them as well?

Intake manifold is stock

[Big Bronze Rim]

There is a way to test them, but I have had limited luck with the test. I have had 2 die on my sr - ignition would break up under boost above 4k rpm, but would idle fine. All the coils tested ok, but the coil finally decided to die completely making troubleshooting easy. You can also check for an internal injector leak by unbolting the rail, lay it on some paper towels and cycle the key to run the pump and pressurized the rail and check for leaks on #3, although it may not actually leak at idle.

[godzillarb]

That sounds a lot like what happened the second time, as soon as I hit some boost it killed the plug. After swapping in all new plugs the car idled great, until hitting boost and then it was ass.

I was running a little more boost than usual at the track...maybe that had something to do with it (14 instead of 12)

[slider2828]

First you should really read your plugs. Fouled can men anything from a blown piston ring, leaky injectors, or misfiring spark plugs. Don't jump to conclusion a the plugs will usually tell you exactly what happened to that motor. You can find a guide to reading plugs on google.