i have a 93 wrx and im having trouble, the car will not boost properly im suspecting the plugs have something to do with this as i have already had problems with the coil packs i have replaced them with bosch mec723's and changed the plugs it was ok for a couple of days and now no boost it just holds back, the car is on standard boost with an uprated panel filter and turbo back 3" system,

what are the best plugs to get and wot is the standard gap supposed to be?

 

Do a search this was covered last week.

Bosch PRF6 or 7s something like that with 0.7mm gap

 

plugs go for ngh prf6bs or prf7b's something like that. 'Withi yours being more or less standard you can use the prf6bs. Gaps should be set to about .7mm.
If you have had problems before then I would reset your ecu to clear things up and see how you go from there

 

cheers to you both jaytc2003 do you mean ngk plugs?

 

NGK PFR6B gapped to 0.7mm

 

yep covered it not a few days ago..

NGK indeed..
PFR6B
or
PFR7B < preference

both 0.7mm as Jay states.

Andy

 

how come their gapped to 0.7mm iv been looking back through posts and theirs one listing loads of plugs and gaps but their all between 0.30 and 0.44
iv been playing aroung woth a set of champions tonight set to 0.29 and it boost a bit better but still isnt right is this because of the small gap

 

well they are definitely 0.7mm

I suggest they are talking ****e then, because even the non turbo impreza is something like 1.1mm gap from memory.


Andy

 

put a set in today and it was better on idle but when i gave it some it wudnt boost again so road arount for a bit tried again and it was spot on but then after that it faild again, just tried a ecu reset but not sure if it worked so gota put sum more fuel in and try it again tonight

 

i had same prob & it was my coilpacks, try um!!