I am having a fews issues with my car running quite badly when the throttle is first pressed. It appears to have a delay when the throttle is pressed almost as if it takes a second to get fuel delivery.

I had the car mapped by Simon at JGM and he told me the car did seem to want more fuel than he would consider normal when the throttle is blipped and was not too sure what would cause it.

I suspected a hole in the intake pipe to which he said it is possible but he would expect a hole in the intake pipe to affect the rest of the rev range and this wasnt the case.

Another member on here said i would be better getting an aftermarket FPR to go with the other mods so i have ordered one, which i have not yet fitted, but this morning whilst on my way to work i put my foot down in 2nd gear and when it hit full boost it hesitated which is the first time i have seen this happen. The injector duty cycle hit 100% for some reason?

i have attached a picture of what my hand controller readings were when i got to work.

Just wondered if any one else may have some suggestions or could confirm my suspicion. Picture below

http://s12.postimg.org/rhxxpgo7x/dsc_317.jpg

Thanks for any help guys

 

Post a list of mods?

 

The car has the following mods

blitz back box
decat center section
gizmo manual boost controller with three port boost solenoid
forge dump valve
apexi fc commander ecu mapped by JGM
roger clark motorsport uprated oil pump
warlboro 255lph fuel pump
K&n panel filter
excedy stage 1 clutch
Hks boost gauge
oil temp gauge

 

Her is a video of the fuel pressure under full load


greenshot download

Fuel pressure at idle with vac pipe


windows print screen

Fuel pressure at idle without vac pipe

Car seemed to run fine during the run and the max injector duty during the video was 87% ish

seems to play up worse in the morning or on cold starts, go figure

 

does the car have a cold start valve on it at all,

by the way it is a 1997 version 3 wrx


image hosting

 

Well it was a toss up between the injectors and the FPR and i think the FPR has given up the ghost as i tested the fuel pressure when the car had been sat overnight and it refused to moved over 2 bar even with vac pipe removed.

FPR or blockage in the fuel system im guessing, just hope i havent done any damage driving it like this.

Thanks for all your help