I just put a fuel filter in, thinking that would fix it. It idles fine... A little popping here and there, but I think its probably pretty normal. It revs up smooth with quarter throttle, but if you go to blip the throttle at 50% or more it just revs up a few grand and cuts out and if you hold the throttle it will rev up to 4k and cut, like a rev limiter almost. if I hold the throttle less I can get it up to 6k. If I drive it, forget it. unless I baby it, its like a bucking bronco. it will boost up to 10 psi, but it just barely makes it there before it cuts and bucks. its like fuel cut, but not supposed to!... MAP? TPS? IAT? Low fuel level?

new walbro pump in it.

 

How much boost are you running? It could quite possibly be fuel cut...

 

its stock.

I can drive it just fine as long as I don't push the throttle past 1/3 it seems. It boosts fine. and drives nice, but if I push the pedal it immediately cuts out and falls on its face. I am beginning to think it may be the TPS

 

do you have a boost gauge? I'd suggest getting one..

 

shouldnt be fuel cut if its cutting out at 4k when revvving....you cant overboost to fuel cut in neutral

sounds like ignition breakup of some sort...or lack of fuel pressure....when was the filter last changed? check ur spark

 

could it be a clogged cat?

 

I have a boost guage and an ect guage and an egt guage. I don't think its ignition related. Because it doesn't breakup like misfiring... it cuts out completely like I have let off the throttle. Unless the igniter is taking a poop and killing the whole ignition system under certain loads. I would imagine like other cars once an igniter goes... its gone. Clogged cat? I don't think so... Vacuum is good, quick spool up, feels very peppy, except when going past 30% throttle.

I have an idle of about 1200 rpms... I have code 11. I just got the thing running...

New fuel pump - just put a filter in today.

 

code 11 is the intake air thermosensor.

http://www.fd3s.net/engine_codes.html

 

Did you put the fuel filter in correctly?

 

In my case, a bad IAT made it run very rich, as in black smoke, quickly fouled plugs, fuel dilution of oil and way less power...especially bad when cold. But it was less power across the rev range, not really the symptoms as described.

 

Code 11 is one that can throw the car into limp mode. Fix the code and then see if your symptoms still persist.

 

Is that a "can", as in may ? I never went into limp mode with a bad IAT, just loss of power from a very rich A/F.
He could be in limp, but I wonder if he has multiple codes.

 

other codes... yes. I haven't cleared them yet, so I think some are due to having intake apart with key on.

But I had 11, 16, 03, 28, 38, and 39

its a JDM - so thus eliminates 16 and 28.

03 is crank sensor... G signal. I have none of the symptoms related to that being bad, plus I have checked and the sensor has the correct resistance.

11, 38, 39
IAT
Solenoid AWS
Solenoid Relief

I couldn't get codes to clear last time I tried, but things were more screwed up than. I have to try again.

 

Just realized, I don't think its a 03... I think its 30. The flashes were 3 slow like 1 sec each, and if nothing follows thats zero in the ones place>? that would make sense... what is split air bypass??? doesn't seem like any of these codes are current faults besides EGR...

 

i was just having similar problems. I had just put a walbro in and the car then when i tried boosting it would buck and fuel cut.

im 99% sure that ur fuel pump is leaking under pressure. Check to make sure their is no way fuel could leak out from where it attaches to the piping. What i did was i cut the piping alittle and bought a fuel line to connect the pump to the piping. Clamped each side which made it much for prone from leaking.

 

I boost ok to 10 psi, under about 30% throttle... it seems ok to boost... but doesnt matter where I am or what I am doing... anything over that much throttle... even at idle cuts out.

I have my sights set on TPS

 

FWIW, If your seeing boost (positive pressure) on you gauge, I don't think your in limp mode.

 

You might want to also check the throttle linkage -- less than 30% throttle shouldn't get you to 10 PSI.

 

do what i said........ check the pump

 

10 psi, I only saw once, and it was a real fast peak. It drives beautifully under 30% throttle. its "fast" as it can be at that much throttle, turbos spool and it is ready to take off, I can rapp it out as far as the rpms will go at that much throttle, which I got up to 6000 rpms, but give it more throttle and its like your taking off the throttle, and it blows out the intake as well. wisps of air! if you can believe that! WISPS!

What is this fuel pump leak you are speaking about? its an internal leak? like from the fuel pump up to the housing? leaking between there? how can you tell?

 

for me, it was leaking were the pump connects to the housing. The stock setup uses rubber washers where it connects. I bought a fuel line, took the stock rubbers off (cut part of the piping which is connected to the housing) and connected the pump using the fuel line and clamps. THis way i didnt leak any fuel. I had the exact same symptoms as u, and it happened couple days after i installed my pump.

Their no other way to tell if you have a leak. Its assumption. If your not over boosting, then its ur pump.

 

^^^^u should be able to check if the pump is leaking if u can splice a fuel pressure gauge into your feed line...
i do believe a stock fds fuel pressure is somewhere around the 35psi range.....but i dont recall for sure.....
u should make rouglhly a lb of fuel pressure per lb of boost........when u start to boost the car and the fuel pressure drops off.......then u know it is leaking (ie starting fuel pressure 35psi @ 10lbs of boost = 45psi)
i would not be convinced that u have an internal leak......but fuel pressure would be definetly something to look into due to the symptoms. plus the fact u were just playing with the fuel system (ie changin fuel filters)

 

i changed the fuel filter in the hopes that it would cure this problem. It seems to have helped it runn alittle bettter. But the cut off is abrupt. I just don't under stand if I can boost fine at 1/3rd throttle, but i cant rev it past 1/3rd throttle idling - how is that a fuel problem? is it simply not able to supply the fuel on demand because it is leaking out so fast? what exactly was your symptom like?

 

symptoms: no matter what rpm.... whenever i tried to boost (i guess more that 4psi ish) it would fuel cut. If i didnt boost itll go to w.e rpm. Whenever my gas tank was almost empty the cars idle sucked, i dont know why. I re-did the pump and back to 100% normal..

CHECK THE PUMP AND DO WHAT I SAID. please

 

If you still have code 11 on the stock ECU, the car is going to run like crap.