driftedRX7

Hey guys, I jsut recently got my FD and did a few fuel mods to it. 1600/550cc injectors, Walbro 255 pump and a few other minor mods. After putting everything back together I tried to start the car. When doing so it cranks and sounds like it's trying to turn over but won't.

Now if I do that same process but give it the smallest bit of gas it will start up but only stay running for as long as I give it gas. When I say give it gas I mean I am giving it probably 10-15% of throttle. Does anyone know what could be wrong here?

A few questions as well. I just put in the Power FC to control the new injectors and pump but I haven't even gotten a chance to tuen it yet. I tightened the screw all the way in the TB and then loosened it a half turn like I have read. I also have been trying all this without my Greddy elbow on and without my IC pipes and IC hooked up. Does that make a difference?

I have replaced the spark plugs since the first time I tired all this because they were fouled really bad. It almost feels like the car isn't getting enough air. Anyone got any ideas?

bryant

i think the pfc takes 30 mins to learn so it will run like sjit for a minute.
and you should have the intake piping on. unless you are single turbo.

DarkLikePoe

I could have sworn that you need to change settings in the PFC for larger injectors...

driftedRX7

Well the PFC has a base map for the stock 550's which run the car at idle so I shouldn't have to change anything on the PFC. I am single turbo so the IC pipes are off but I wasn't sure if that was what is causing it. I had another member say it might be the TPS and that I might have to mess with that but he wasn't sure.

As far as letting the PFC learn I don't think I should sit there for 30 minutes and give it 10-15% throttle jsut to keep it going.

Anyone else have any ideas?

bryant

im just stating what i think!
i have read on hear that it does have to learn, and it takes a minute.

RX7 RAGE

iTrader: (22)

Post this in the PFC section. You have to setup the 1600s via a datalogit as the commander only goes up to 1500.

driftedRX7

But my point is I am only trying to get the car to idle not go anywhere, thus the secondary's mean nothing because they aren't being used at low rpm/idle. I have a feeling this isn't a PFC issue thats why i posted it here.

BTW: I appriciate everyones info and knowledge. Please don't take the way i type that wrong way. I am just happy you all are taking the time to lend me your ears.

maz-rx

I posted on nopistons, The screw you adjusted on the throttle body is the idle screw so winde it out a little more it may help.

You should connect everything up before you run it so it can do the learn thing. It should start and idle as you say the primarys are still stock.

papsmagu

iTrader: (19)

double check the setting to the map sensor, i had a pfc act the same way when i installed into an FD and after i changed the setting on the map sensor it idled smooth. if i remember correctly it is in the setting 3 tab under "PIM Scale/offsett"

driftedRX7

Paps I think your probably the closest to the actuall problem here. I am somewhat of a disbeliever in the whole PFC has to learn thing. I mean their is no way that a PFC changes it's base map. It's a set of equations that have been set out for the stock injectors. Sorry I just can't believe it has a learning capability and not to mention the PFC Manual says absolutly nothing about it.

bryant

https://www.rx7club.com/showthread.p...t=pfc+learning
https://www.rx7club.com/showthread.p...t=pfc+learning
do a search

not sayen thats your problem (the pfc learning) just tryen to help a fello rx-7 lover out.

thanks

SPICcnmGT

Here are my suggestions:
1. make sure you map sensor is hooked up.
2. Might want to re-initialize your PFC, if it isn't tuned, which seems to be the case.

If it doesn't idle at all after these are done something else is probably wrong, and it is not the PFC. Also to restate what you said the 1600cc settings have nothing at all to do with idle. And finally I don't know how much the idle learning thing helps either. I did it the first time I installed mine a few years ago because that is what I read I needed to do. But later on I re-initialized it and just drove it and it eventially idled as before after driving for a bit.

driftedRX7

Well the rx7 has a brand new out of the box Power FC so nothing has been changed at all.

Mahjik

iTrader: (1)

Have you verified that you are getting the correct fuel pressure? Are you using the stock FPR or an aftermarket one?

driftedRX7

Stock.

ATLGT

iTrader: (1)

When you take your foot of the gas, does it hesitate or just drops to 0 rpm and stall? If that is the case, throttle position sensor isn't kicking in on idle. My friends truck did the same thing. Either vaccum hose is bad or TPS is bad.

driftedRX7

...

anyone else?

hus

For what little bit I know...is the Walbro getting enough voltage? Not that it shouldn't be because most all do but maybe it has something to do with your FP install.

Bad_Karma7

Try changing your settings in the cranking inj on your PFC.