klint

So far I have depowered my rack removed all power steering and ac components, i've removed both cats and blocked of the hole left from the one cat pipe, I've also bolted on a high flow filter on to the afm, my air tempeture sensor is currently broken, my problem is the car wont idle and really lacks power when I jump the fuel ckeck plug it runs alotbetter but still rough, I was wondering what sensors that disables other than the afm, or does the fuel pump just contantly run when you jump that plug?anyway another problem I have to fix is also the wastegate doesn't seem to be opening, can this cause lack of power, i was planning on taking the turbo off and porting the wastegate slightly larger as well. anyway what i was actually wondering is if i remove the pump and acv and egr will the engine still produce enough vacuum to run the remaining vacuum relying parts? Sorry for the long spill I just would like some help or advice on these subjects

RotaryRocket88

iTrader: (7)

1) The air pump, ACV and EGR have nothing to do with engine vacuum.

2) A wastegate that doesn't open will cause you to overboost and make MORE power (and usually blow your engine); not the other way around.

3) Jumping the fuel pump connector just bypasses the AFM's fuel cut safety switch & allows the pump to run whenever the key is to 'ON'. Test/replace your AFM if the fuel pump switch isn't working correctly. That's just one function of the AFM.

klint

Thanks for the help I've got my bugs worked out and every thing seems to be working properly, the only other thing is the air supply valve on s4 manifolds should this be plugged in or should it be unplugged, the car seem's to be running alright with it unplugged and what does it even do its not connected to anything and all there is, is what looks like an ajustment screw??? i search the archive and none of the threads mentioned what to do with this? any ideas anyone?

RotaryRocket88

iTrader: (7)

The ASV is used to correct idle speed, mainly when the power steering pump puts a load on the engine. You don't really even need one when you have P/S; mine was removed when I assembled my engine.

klint

oh really i didn't know that , well it all seems to be running and idling fine now I'm glad to get rid of all that vacuum line. I noticed now though that with everything i've down to it hesitates at high rpm sometimes like its not recieving enough gas i still have all stock fuel though, i noticed that you run an fd pump how much mor pressure does that put out than an fc pump?

RotaryRocket88

iTrader: (7)

It doesn't raise fuel pressure; a good fuel pump won't do that. It just has much better flow at high pressures, which is necessary when running higher than stock levels of boost.

Your problem is not likely fuel pump related. It's most likely fuel control related, which would involve the ECU and sensors. You mentioned the intake air temp sensor not working, so get that fixed. If it doesn't work, the ECU will overcorrect and add extra fuel. You also mentioned the wastegate not opening, which could mean you've overboosted and blown the engine. A compression test should be done, as well.

jasons7

Thanks as well too. This thread helped me too I ordered a jdm s4 t2 and my asv came in broke. I didnt know if it was that important or necessary.