i have a 2k 5-spd power mods include... fixed vi, mid pipe, pulley, y-pipe, clutch, flywheel, updated coil packs, iridium IX plugs, grounding. last time i dynoed was before the new clutch and fidanza, at that time i dynoed 197 to the wheels. i dynoed yesterday and got 167 to the wheels. i have absolutely no clue wtf is going on here. could this in any way be related to a completely dead post cat o2 sensor? knock sensor? MAF? or could it all be caused to the vi? is there a possibility that it couldve broken again? ANY HELP IS APPRECIATED! thanx in advance.

 

Were you using the same dyno in the same shop as before? How much time and how many miles between the two dinos?

In any problem-solving exercise, you have to determine what has changed since the time of the two dynos. Write this down.

 

same everything... the only difference since then is like 3000 miles, my new clutch/ flywheel and plugs. e55 has been tellin me that most likely my vi crapped out again but i wanna exhaust all ideas before i replace it.

 

Post teh dynograph once you get it, so we can properly diagnose the problem. My guess would be the VI is dead because you said peak hp was lower than 5000 (should be 6700 on DE-k).

 

i pulled out my vi and i dont see the brass cup loose or off the solenoid part, another thing i just remembered is that eversince i did my pcv oil catch can ive been loosing oil, not burning, i say loosing because i cant find any oil arks on the motor nor do i smell anything burning under the hood or from the exhaust.

 

I think others have reported problems with engine performance with the iridium IX plugs. Most suggest sticking to plugs by NGK.

Would be easy to see, put in some fresh NGK plugs and re-dyno.

 

they are NGK Iridium IX's

 

but even if there was a power loss with the plugs, how in the hell would it be like 30 horses?

 

Not sure. Can't remember who reported problems with the iridium plugs. Hopefuly someone else can add more information.

 

OMG ... the guy that has my sheets is nowere to be found!>!>!>!>!>! lol

 

Maybe dead KS.. that kill about 30 horse

 

Yeah, I am thinking this will be the first case of a dead 5th gen KS I have seen. Lucky you I have a used working one for sale for 35shipped

 

Here is his dyno:

 

how hard would it be top replace the knock sensor on the 5th gen? wouls i have to remove the entire im? if the knock sensor was dead would i have a code?

 

Your VI is not activating, notice the TQ curve beginning to fall ~5000. The VI is mostly to blame. That switchover you heard was your VC muffler opening the secondary outlet.

 

Not sure how it is for you 5th gen guys, but on 4th gens the KS code is a Ghost Code. It will throw a code, but it wont set off the SES light. So find some1 with a OBD2 scanner and check for any codes, just to make sure

 

from the dyno, looks like the vi isn't working...

 

well two things, one i pulled my vi out today and saw that the cup and spring were still intact, i have not yet checked to see if the solenoid is switching over. another thing i was coming home from the movies wit my g/f and i got yet another ses light, gonna have to see what it comes up as manana. in order to fix my vi once and for all wtf am i gonna have to do?

 

I have a code reader....

 

ya but ur all the way in BFE Orlando, lol. im jus gonna head over to discount n get it pulled.

 

rich has one

 

i got them pulled form discount auto, this is what it read........


p0300 random/multiple misfire
Misfire detected

and

p0105
MAP/ BARO
Circuit Malfunction


i had the guy clear the codes and i currently have the car running now to see if i get them again, the coils have already been replaced with the updated version and i have a spare MAF, waiting to see if it some up again.

quick question, when the vi opens does the solenoid open quickly or is it kinda slow?

 

It opens VERY quickly and I assume its the spark plugs, are they gapped correctly?

 

they are supposed to be pregapped i cant remember if i checked their gap before putting them in.

 

bump for misfires, have u solved this yet? O_O_O

 

im gonna yank out my vi rod today and see if its cracked or damaged in any way.

 

good luck with that, but... why did u get a misfire code? thats not VI related...

Hope that flywheel is not messing up your timing in any way or something :-\

 

less say i do pull out the rod and see if its busted, whats the probablity that nissan sells them seperate?

 

the rod wont be broken. the cup that it sits in is what breaks. best bet would be to check junk yards or you could use the fix that SR came up for mine if it proves to work.

 

well thats whats weird, i already pulled the cup and saw that it is holding awesomly, i fixed it a few months ago and i dont know wtf is going on!

 

have someone rev up over 5k and check to see if the actuator is moving.

 

it does move, already been tried n true

 

Just a really quick, maybe dumn question: Do you wash your engine bay out with a hose or get it really wet? On my old 4th gen I would do this and eventually found out that I somehow would fill my plug cavities up with water and it would foul the spark plug causing a real bad missfire problem. Just a thought.

 

well i recently did my clutch and flywheel, and the guy did wash the bay after he was done, but he air dried it out and when i pulled my plugs i didnt see any water.

 

Ok...maybe not related to your problem then. My problem was severe enough to notice rust residue on the coil stems and the metal inside the plug tube was all rusty. This only happened on the rear bank of plugs.

 

just to be on the safe side ill pull them again tomorrow and double check the coil packs and plugs, ill even put the pix of plugs online for comparison..