hesitaion under high boost

[dvs-b4]

hey guys my 2001 wrx v7 sti has 100k on the clock

has a real bad hesitaion/miss under high boost (15psi up)

have tryed a dif afm

changed plugs 2 times

changed air filter

changed fuel filter

changed fuel pump

changed bov to a gfb one

put an ebc in and still does it

have done snorkelectomy to it but did it b4 i did that and didnt get beter or worse

has a zero sports pipe thingy

runs fine up till 15psi

does have a tuned by HKS sticker on the inside of the gas flap but do they tune factory ecus??? havent had car to long

has factory down pipe with cat in it but zearo sports cat back system

any ideas on what it could be???

has me nd my mates stumped

cheers dvs-b4

[EJ20T]

bad coil

[marc]

Yeah or your plugs are blowing out. You using proper platnums in it or coppers? If coppers what gap?

[dvs-b4]

Have been thinking coil but needa find a new set.

Im running bkr7e coppers gaped to .8

[Pappu1]

the gap seems ok as within spec

i personally run 0.76 as the gap recomended is 0.7-.08

as a quick trial maybe gap it to 0.75 or something

(unsure if how much that will help)

I have a set of coils u can try - im in auckland/manukau

i had similar issues and one of my dam sparks had a hairline crack

[dvs-b4]

Yea myte try regap them down to that.

Sweet myte hit u up bout them. Have droped it into a mechanic to see if they can diagnois it so will see how they get on.

Yea thaught bout a cracked plug so changed them again nd same thing.

Its not rpm dependint its load if that helps does it as soon as it hits 15psi in all gears

[Pappu1]

 dvs-b4 said:

Yea myte try regap them down to that.

Sweet myte hit u up bout them. Have droped it into a mechanic to see if they can diagnois it so will see how they get on.

Yea thaught bout a cracked plug so changed them again nd same thing.

Its not rpm dependint its load if that helps does it as soon as it hits 15psi in all gears

sounds like blowing spark as others have said..

yea the mechanics should easily diagnose if its bad coil...

[QRAF]

when you did your fuel pump did you change your fuel sock that attaches to the fuel pump?

[dvs-b4]

Mechanic recons myte be a coil nd is gona get them tested

Yup did change the bag 2 put a walbrow in