i have N plate subaru wrx import i changed my plugs to ngk pfrb6 yesterday and gaped them at 0.006 as told to do so now it runs mint but since changing them, the revs drop up an down on idle any ideas?

 

gap sound be 0.7mm to 0.8mm on those plugs or sounds like you may have disturbed a vac pipe

 

0.006" is 0.15mm, if that is what you've set them to, that will cause horrendous misfires at idle.

I suspect the recomendation you folowed was meant to be 6mm?

Simon

 

if you have really managed to gap your plugs at 0.006 i would love to know how, a human hair is only 0.050mm .
34srm is right 0.7 to 0.8mm is the correct gap

Mike D

 

If running more than OEM boost target, then between 0.6/0.65/0.7mm is 'recommended' (should prevent possible spark "blow-out" at max boost).

 

sorry slight miss print ha! set them at 6mm. it drives mint no miss fires whilst driving just shakes a alot on tick over and revs up and down between 0-1000rpm. i checked for cracks, splits in pipes and boost leaks and found nothing.

 

Typo again! .6mm . I'd love to see a gap of 6mm! lol

It can be common to disturb and break old a coilpack-on-lead (your MY96 car has this type of coilpack) when changing plugs - just a thought...

 

i know he has changed the plus, but this has to be a vac leak issue for the rough idle. maybe hard to spot a split but you have to check every breather pipe and vac line. everything on the inlet. between the filter to throttle. check everything.