Need Some Help With Diagnostic

[shaun123]

hey guys,

sometimes in my r33 gts-t when i am in 3rd and boot it, go into 4th, try to accelerate - there will be no power, it feels like the car jerks forward like its trying to go but doesn't... eventually, the car comes to a stop and it tries to find idle (0-1500rpm), up and down but it cant.

I have to switch the car off, wait 30sec-1min, restart the car and then its fine.

the problem is very hard to recreate, it only happens rarely and the last time it happened i thought it was a clogged fuel filter but it obviously wasnt that.. anybody know anything obvious that might be causing this?

[paulr33]

check the basics

check the AFM plug

check the CAS plug

check the throttle body plug

reset stock ECU

try cleaning the AFM

check boost control - what does guage show? is it working? is it stable? are you running unlimited boost? mangled boost controller?

[shaun123]

hey thanks paul, could it possibly be the fuel pump as well ? because sometimes it sounds a little noisy (when the key is set to ON)...

what is the CAS plug ?

i dont have a boost controller, the car is completely stock apart from a cat back exhaust, my boost gauge reads 0.5bar when on full boost and holds that, doesn't spike (when the car is running ok)

Edited July 25, 2009 by shaun123

[Moodles2]

CAS (crank/cam angle sensor) is that big silver/white thing attached to the front of your timing cover, on the bottom left there's the CAS plug. I would use this as an excuse to replace the fuel pumps and maybe the fuel filter as well if you've done all of paulr33's steps, come back if this still happens..

It's not misfiring or knocking is it?

[paulr33]

if its the fuel pump the engine will basically stall

its unlikely to half work, half not

and if the pump is toast, i'd expect the car to not start

[shaun123]

i've checked most things now, AFM plug, cleaned the AFM, changed pods, reset the stock ECU, changed fuel filter etc... but im still getting this problem, anybody know of anything else that could trigger it?

i've narrowed it down to a more consistent problem i think, anytime i have the accelerator flat above 4500+ rpm, it will feel like the power is on then off then on then off etc..., like short bursts of no power then its back

Edited August 22, 2009 by shaun123