Hesitation Over 4.5k, Loss Of Power?

[gts-4 dreamer]

Hey guys, used 3/4 of my lunch searching for an answer so im just gona ask,

got a problem, s2 r33, stock ecu and boost control, once over 4000 rev's the car begins to hesitate and it feels as if its loosing power, i.e. it just pull like the 5psi below 4000 is pulling hrder..... where should i begin the look.

possibilities ?

im no mechanic but i can pull stuff apart... famous expensive words, point being, the exhuast manifold looks ok, dont hear any leaks when idling, cant hear any leaks but cant tell over the whine of the car, it has always made a high pitched leak sound but it comes out of the right end of the exhuast, probably due to my small 2.5" exhaust, my stock dump is bigger.

[d00dz]

Sounds like its mis-firing?

Do a search for missing or mis-firing or sparks or coils or coilpacks. Should come out with some answers?

Id say check sparks and coils for hairline fractures. or just check sparks and buy new splitfires mmmm yummy.

Also check AFM is working properly.

[gts-4 dreamer]

cleaned recently with electrical parts cleaner stuff, spray on shite you buy

It doesnt really miss fire, was fine had been driving for a while then booting it comeing onto the freeway to get up to speed and hesitation and i stopped excellerating, its fine below 4k rpm but soon as you hit the second stage boost it goes nowhere

also has 2 other issues worth noting, has unknown size deep purple injectors and has always run rich while i've owned it, also has had a swap to platinum plugs 2-3 months ago

Edited July 13, 2006 by gts-4 dreamer

[RANDY]

My stocker's injectors are purple too. That's normal.

Definately look for the coilpack thread. I changed my packs, and now that problem is GONE!. =-D

[R33S2]

Its at the top of the forum page doh!

[Modena]

Check the soldering in the AFM, might be loose and need re soldering. Mine was stalling and losing power after 2000 K rpm, then it got worse. Got new AFM, it fixed, then later foudn out the previous AFM had solder come off.

[GTAAAH]

And while you have your coil packs out regap your pluge to .8mm, worked like a charmmm for me

Try search for, "power loss" in forced induction, or look for any of the topics i made about it

[GTAAAH]

ewwww double post and a spelling mistake, does it get much worse

*plugs

Edited July 13, 2006 by r32 gts-turbo

[gts-4 dreamer]

I should have specified a bit more, aparently STOCK AS A ROCK power wise STOCK BOOST !, unless you count a muffler change, which is all, + the adjustable shocks and quick shifter she's completely stock, had no idea the injectors on s2's were deep purple, every one I have seen have been black or white and when i asked onthe forum specifically about htem was not answered, aparently too silly a question eh?

anyways

the problem has all but disapeared, it only seems to happen once the car is warm and when i mean warm HOT, aparently the misses must have used the loud pedal a fair bit on the way to pick me up cuase I had to take it to a track to heat it up enough to get it to start doing it which is did after about 20 minutes of hard running.

still sound like cracked plugs or coils ?

WIERD !!