fuel sytem diagnosis????

[Corollenertia]

okay My injecotrs are not shooting fuel or some thing. I went thru the process of taking the supra injectors out and putting t blue tops back in.when i removed the sup[ras fuel came out the fuel whcihc means its in the fuel rail its getting there but the injectors are not opening. I came to this conclusion when i spray starter fluid in it and started it and it stayed on for about 30 seconds then when the starter fluid ran out it went off. It was awesome to see it start for the first time but I really need to get it to come on with out starter fluid is all.

SO heres what my fuel system looks like.

Sr5 gas tank
170lph 125psi max cut off inline fuel pump
stock blue top injectors
stock fuel rail
stock fuel pressure regulator.

uhh i ant think of anything else any help is extremley appreciated

[etxxz]

maybe the injectors are juist very dirty and bad.

also, are you running the sr5's original fuel lines? they will blow up any moment now as they were meant for like 10psi...but will they'll stand it for while. I'm running 255lph fuel pump on my 20v gt-sr5

[Flashmn]

Might be that the injectors use different impedance. Supra can use either low or high impedance, JDM injectors are high impedance and UK/US are low impedance.
If you have the wrong impedance, your injectors wont obviously work and you might fry your electronics.

[Corollenertia]

how do i find out what the injectors are as far as impedance or size jdm or usdm. I just have a usdm wire harness i believe and us 4age injector resistor box thing. but i do know niether the supra or the 4age injectors were working opening at all .

[Flashmn]

calling toyota, trying to google it. I sure as heck dont know what impedance they are

[Corollenertia]

Thanks man ill do that. illstart calling. ohh as for etxxxz Myfuel lines are safe. in the sr5 I have a inline pump that is in the engine bay. that puts the sr5 fuel lines on the low pressure side of the pump and are only used to draw fuel to the pump. i have about 2 feet of high pressure line afte the pump.

[toyotaspeed90]

the impedence has nothing to do with where they are from..... they just used different injectors in different car setups.....

you might be missing the resistor box that the bluetops use......

[KnightX_AE86]

mayb u can check the ground wire on the injectors too.... thats wut happen when i put my motor back together.. i didnt ground that ONE wire and my car didnt start and it took me 4 hours to find that problem... lol so check it out... just a thought

[toyotaspeed90]

Originally Posted by KnightX_AE86

mayb u can check the ground wire on the injectors too.... thats wut happen when i put my motor back together.. i didnt ground that ONE wire and my car didnt start and it took me 4 hours to find that problem... lol so check it out... just a thought

the negative wire on an injector is actually the wire that opens it...... (ie, the signal from the ecu). there is constant 12V (you can check that easily) and when a ground is supplied the injector opens.

Originally Posted by Flashmn

Supra can use either low or high impedance, JDM injectors are high impedance and UK/US are low impedance.

so.... a bigport from japan with blue injectors are high impedence even though they work PERFECTLY in us electronics??? and US bigport bluetop injectors are low impededence, and US smallport injectors are high impedence..... what's going on here?! wait! even more confusion according to you! 4agze (bigport or smallport) injectors, from ANYWHERE (the rust brown ones) are ALL low impedence

[toyotaspeed90]

just an FYI.... i picked this up for you over at mr2oc Corollenertia:

http://www.geocities.com/MotorCity/P...Injectors.html

http://www.geocities.com/MotorCity/.../Injectors.html

http://home.earthlink.net/~rotaryen...ctor-table2.txt

http://www.autospeed.com/cms/A_0102/article.html

http://www.wolfems.com.au/support/injectorflow

[Corollenertia]

thanks man yall are the greatest. it almost makes me want to Abandon my356 whp fwd turbo eclipse anddsell it to put parts on the corolla. but thanks alot this is the last problem. so its not the fuel pump for sure with 170lph and 125 ps max cut off causing problem you guys dont think that has anything to do with it?and if they are not grounding out where is the ground wire that i need to ground on the harness to geet them to work?

[KnightX_AE86]

if your takin abuot the injector ground then its under the fuel real on the top side of the intake man.

but i think there is n other ground on the driver side.. its like a hook that grounds to a little nut on the block itself... i THINK thats a ground wire too... correct me if im wrong =)

[toyotaspeed90]

that ground is NOT the injector ground..... that is the main ecu harness ground..... like i said.... the grounds on injectors are the signal wires directly from the ecu (unless it runs through a resistor pack first)...... and yes, i know you are talking about the brown ground wires (like 8-9 of them on one connector) on the intake manifold under the plastic wiring holder......

[Corollenertia]

it works now un fortunatley not by my efforts guy who sold me the swapp came over ans spent two hours to get it to run
although the cold start inject doesnt work

[toyotaspeed90]

cold start injector should be wired directly with the green plug coolant temp sensor..... that sensor is actually a switch....... the 12V wire that runs to both of those also runs to the starter (the small gauge wire)