need help could my walbro be going dead?

[86_sports_1jz]

hey guys i need some help, there is something really wrong with my car. it runs super rich at idle and partial throttle, around 9:1 a/r but once i hit wot it gets super lean, 14+ a/r... it also chokes and bogs like crazy under 2000 rpms or 35 mph, it feels like its not going to be able to move anywhere because it chokes and bogs at 1500 rpms but once i get above about 2500 rpms it runs a little smoother but still bogs and chokes alittle. overall it runs really rough no matter at idle or when i'm driving and it sucks gas down like no other, i drive around town for like 10 minutes and i can see my gas gauage sink. i think it could be my 550s gone bad or maybe my walbro fuel pump, i thought it was my 1j ecu but i put in a patch/jumper harness with a 2jz ecu and an emanage ultimate and it still runs the same as when the 1j ecu is in. i've switched the ecus around numerous times and i'm stomped so i was hoping you guys could help me out. my mods are pt70 single, 255 walbro, 550cc usdm injectors with 7m resistor pack, and a 2jz ecu with an emanage ultimate. let me know what you guys think and if you have any questions just ask.


thanks, toua

EDIT: I forgot to add that it happened before but it went back to normal after i turned off the car for like 5 minutes then turned it back on and there were no codes thrown. it also idles around 5-600 rpms with misfire. walbro has 12 volt mod and the car ran fine with the 550s before this problem

[SimpleMKIII]

get a cheep fuel pressure gauge that you can tap into your fuel rail with hose... duct tape it too your window. See if it matches boost from stock fp. If not check fp or fpregulator. If good, check your plugs. Probably chocking and boggin bc of your knock sensors kickin in.

[mensrea]

is it getting flooded?
thats the prob I have.
If your pump was going bad wouldn't it run to lean most of the time ?
Im thinking the ecu is dead on mine, still have to get a new one and check it out.

[86_sports_1jz]

Originally Posted by SimpleMKIII

get a cheep fuel pressure gauge that you can tap into your fuel rail with hose... duct tape it too your window. See if it matches boost from stock fp. If not check fp or fpregulator. If good, check your plugs. Probably chocking and boggin bc of your knock sensors kickin in.

i know my plugs are fouled already from it running too rich but i don't understand what you are talking about with the fuel pressure and knock sensors...

Originally Posted by mensrea

is it getting flooded?
thats the prob I have.
If your pump was going bad wouldn't it run to lean most of the time ?
Im thinking the ecu is dead on mine, still have to get a new one and check it out.

its getting pretty flooded with the a/r around 9, my car starts off running rich then really lean and i know its not my ecu cuz i switched it around

[whitemkiii]

so you aren't throwing any codes?

[RacerXJ220]

I had a walbro in my tank. One day I decided to swap out the pump because of a bad wire on the relay thinking it was the pump.

After I swapped out the pump with a new Walbro, I gained 20PSI in the rail at idle. Once I set the fuel pressure, it drove just like the other walbro with less pressure. Walbro's were not consistent for me.

Make sure the vacuum hose to your FPR didn't pop off or leaks. Sounds like it.

[86_sports_1jz]

Originally Posted by whitemkiii

so you aren't throwing any codes?

no codes

Originally Posted by RacerXJ220

I had a walbro in my tank. One day I decided to swap out the pump because of a bad wire on the relay thinking it was the pump.

After I swapped out the pump with a new Walbro, I gained 20PSI in the rail at idle. Once I set the fuel pressure, it drove just like the other walbro with less pressure. Walbro's were not consistent for me.

Make sure the vacuum hose to your FPR didn't pop off or leaks. Sounds like it.

ok i will check that and get back to you

[86_sports_1jz]

how can you tell if your map sensor is bad? can a bad map be causing my car to run like that?

[SimpleMKIII]

Originally Posted by 86_sports_1jz

i know my plugs are fouled already from it running too rich but i don't understand what you are talking about with the fuel pressure and knock sensors...




its getting pretty flooded with the a/r around 9, my car starts off running rich then really lean and i know its not my ecu cuz i switched it around

just buy a fuel presser guage like an aem one that you can see your fuel pressure inside the cab, you cant go wrong. Everyone should have one over 300 hps.

[86_sports_1jz]

ok i checked all that and everything seemed to be ok, then i rechecked my codes and got code 31 which is an air flow meter code on the usdms but what is it for a jdm motor? i was thinking map sensor because when i unplugged my map sensor there was no affect on the way my car was running. LMK what you guys think.

thanks, toua

[86_sports_1jz]

oh btw anyone know how to wire a gm 3 bar map sensor in? i'm gonna try that because its cheaper than a oem one

[91turbosupra]

just get a used one ive seen a couple for sale in the 1jz f/s

[86_sports_1jz]

Originally Posted by 91turbosupra

just get a used one ive seen a couple for sale in the 1jz f/s

yea, i just bought one. thanks

[RacerXJ220]

fixed?

[86_sports_1jz]

no not yet, i've been working and haven't had time to work on it. also my new 2j map sensor just came in today, i'll put it on in the next couple of days and let you guys know