I just swapped a s5 longblock into my 87 t2, i'm running s4 high impedence injectors with the wiring taking care of on the resistor block. the car starts and idles but its not getting fuel to the rear rotor but the front rotor is flooding any anything over 1/4 throttle kills the engine. all the fuel injectors have power, but for some reason the rear primary isn't firing. i've checked and rechecked all my grounding points and i've even replaced my ecu. i'm all out of ideas


i also forgot to mention that we cleaned and flow benched the injectors and they all flowed perfectly and i also put new pintle caps o rings and gromets on all 4 injectors

 

Have you done a continuity or ohm test of the Light Green/Black wire to check the integrity of the wire? Does this wire have voltage on it w/key to on as it should? Have you used an LED light to verify whether the ECU was firing that particular injector? And is this a JDM engine or not?

 

its a jdm engine, i dont have any noid lights. where is the wire located? i'm using an s4 t2 harness by the way.

 

I'm sure you're familiar with the difference, but the JDM engines switch the incoming and outgoing fuel lines as they connect to the fuel rails when compared to the USDM versions.

Pin 3Y if it's an S5 ECU or pin 3C if it's an S4 ECU.

 

oh snap! ima go try that! thanks

 

i didnt know but my buddy that helped me put the engine in already took care of that :/

the fuel lines that is.

 

is the harness connected to the injectors correctly? you may have both primary plugs on the front rotor...

 

that's what i thought at first but they are plugged in correctly!

 

The link shows the kind of LED light you would need. They're about $2 at the local Radio Shack (not sure if they have those by you but I'm sure there is something similar to them).

http://www.teamfc3s.org/info/article...odes/main.html

 

yeah we got a radio a shack, i'll check it out tomorrow they are closed already. so the light green wire with the black stripe coming off the ecu? there's also another light green wire with black stripe coming from the harness into a little plug with a brown cap on it and the brown cap has a diode symbol on it, what's that for?

 

Not sure which part of what harness you are talking about. The pin location I gave you will tell you what wire to focus on. When you get the LED you take it to the car battery and place one wire on the + terminal and the other wire on the - terminal and if it lights up then you know which is the + wire and so on. Then take the negative wire and stab it into the back of the ECU plug where the LG/B wire is and the other wire to the pin for the Main relay which is pin 3I (B/W wire) for an S4 ECU or pin 1B (B/W wire) for the S5 ECU. Then try to start the car and if the ECU is trying to fire the rear primary injector the light will flash.

 

okay sweet that should narrow it down pretty good from there

 

Thanks for your help guys! It turned out just like he said, the rear primary injector clip was plugged into the front rotors secondary injector! I swapped them and so far its running awesome!

 

had to diagnose a car that someone hooked up that way, guess they were used to plugging an n/a harness in and not a T2.


you're welcome.

 

+1

when i read the thread yesterday i was about to write the same thing
though you had beaten me with the punch and he had already poo- poo'd it

i had pretty much the same scenario,, owner had tried 4 different harnesses and ECU's
-- even sent it to the big rotor shop who shrugged shoulders at it

needless to say,, twas fixed within the first 3 minutes that i had the UIM off


sometimes it pays to double check the obvious

 

It sure does

Now I just gotta figure out why it's flooding when I shut it off. It takes a lot of cranking to start it again :/

 

We put a fuel pump cut switch in, so you turn it off and let the fuel run out and engine die. No more flooding and hard starts. It is a thought! BTW - you have a PM on the windshield.

 

The car doesn't like it when the engine is turned off before it is fully warmed up. If this does not apply to your situation then just ignore the comment.

 

lol i'm a dumby i had the map sensor unplugged, its running awesome now