What Tells The Pfc To Turn The Fuel Pump On?

[dangerman4]

Im Having both fuel pressure issues, and its running like a pig.

constant black smoke and smells like raw fuel from exhaust.

all cylinders running 150 psi.

im guessing q45 AFM might have clagged up.

any thoughts?

S1 r33 GTST

[Mr. Oizo]

what fuel pump and fpr are you using

also, what is your base fuel pressure at idle set to?

when i installed my sard fpr

base fuel pressure was set to 80psi at idle, so at full boost it was hitting around 100-105psi

wasn't running well at all

[paulr33]

whats AFM voltage at idle?

whats TPS voltage at idle?

anything black in SENSOR SW/CHECK ?

confirm you have VH41 selected in AFM table selection

[dangerman4]

whats AFM voltage at idle?

whats TPS voltage at idle?

anything black in SENSOR SW/CHECK ?

confirm you have VH41 selected in AFM table selection

AFM voltage at idle is between 1.85v an 1.92v

THR is at .45V

and yes there is several things that are black in the sensor check

i will take a pic

[Risking]

The fuel pump is switched by the ECM entirely.

When the ECM receives an ignition input but no RPM signal the pump is run for 3-5 seconds.

Once the ECM receives an RPM input from the CAS it will then start the pump back up again.

Its not easy to diagnosis such problems without the vehicle but as people have suggested check MAF sensor voltages and selections firstly.

[paulr33]

yeah post up a picture, thats fine

by black i mean the sensor name is highlighted in black, not black dots.

black dot means the relay or switch is turned on, empty dot means its off.

so a black dot in FP1 means Fuel Pump Relay 1 is on

[dangerman4]

yeah post up a picture, thats fine

by black i mean the sensor name is highlighted in black, not black dots.

black dot means the relay or switch is turned on, empty dot means its off.

so a black dot in FP1 means Fuel Pump Relay 1 is on

[paulr33]

AFM voltage is very high for idle

2.24 is like half of the q45 throughput

it should be near like 1 or even less

leave it idle, rev it

let it return to idle

repeat that a few times

does the AFM drop to the same normal value each time it resumes idle?

or it does bounce voltages each time it drops to idle

[dangerman4]

AFM voltage is very high for idle

2.24 is like half of the q45 throughput

it should be near like 1 or even less

leave it idle, rev it

let it return to idle

repeat that a few times

does the AFM drop to the same normal value each time it resumes idle?

or it does bounce voltages each time it drops to idle

new prob

no fuel pressure on my sard rising rate FPR.

pump starts up and runs for a couple of seconds then turns off but know fuel pressure at the engine bay.

3 day old 044 grrrr

[Abo Bob]

I have heard of a couple of 044's being dodgy from brand new lately.

[dangerman4]

I have heard of a couple of 044's being dodgy from brand new lately.

so what happens when your at full boost and the fuel pump stops...

ouch!!!!!!!!

i hope anyone that has a 044 doesnt likes there pistons very much.

instantly engine runs lean and boom...

[Beer Baron]

and that's precisely the reason i bought a nismo pump instead of a bosch one.

[2rismo]

Bosch Motorsport 044 for 5 years and ver happy.

[dangerman4]

Bosch Motorsport 044 for 5 years and ver happy.

Bosch motorsport 044 3 days and not very happy.....

im just glad it didnt dye when i had the car on the rollers at 24psi.

[Busky2k]

Apparently there are some fakes going around? Or dodgy ones? Where did you buy it from?