Rb25det Misfiring At Idle

[cooks44]

Hey all,

Just wondering if anyone has any ideas on my misfire problem. Not the common one where it happens at 4500rpm or so, this was the problem but was just the usual "time to replace plugs". Which I did last weekend.

Now with brand new plugs it's missing at idle, occasionally through the rev range but not often. When all six are firing it's perfect to redline like it should be. Of course when you need the power pulling out in traffic is when it'll usually miss while driving *grumbles*

Was worried I've pulled on the coil pack loom too tightly or something, so stripped it down, cleaned every connection, checked it all again. Problem still there... I figure if it was the loom it'd be missing more regularily, not just on the odd occasion.

So I'm at a loss. Bad plug maybe? (might have been dropped at the shop).

Dying coil pack? (although I'd expect that to rear its head under power, not idle)

Dirty injector?

It's getting hooked up to a consult unit to find out which cyl. is missing, but just wondering if anyone knows anything common. It's a S1 R33, got the transistor pack sitting in between the coil pack loom on top of the plastic finisher still.

Thanks!

[FordyR31]

got the right plugs with the right gap?? I know in the NGK catalogue for a redtop RB20 they reccomend something along the lines of BCPRES-11 or something which r shit for that engine. I actually needed BKR6E... I'd make sure u have the right stuff in there b4 changing anything to drastic.

Liam

[cooks44]

Plugs are BCPR6ES, copper version of the BKR6, otherwise they're te same plug. Prefer the coppers atm, stock ECU so it will always run rich guaranteeing the plugs will foul in 20-30,000kms. For the $20 vs $120 for iridiums/platinums I'm happy changing them every 3rd or 4th oil change - which is what I did here.

I've just made up a plate to hold the ignitor module, getting in there to do the wiggle test at the moment. I reckon (or maybe I'm just hoping!) that I got sold a dodgy plug tho... fingers crossed!