t24todd

iTrader: (7)

working on buddies 88 t2 and figuring out why it wont start..traced it out to be a fuel problem. it pumps out plenty of fuel up to the injecters but does not spray them. harness was redone and reinstalled so possibly plug down by the ecu? which plug down there tells them to spray or is this the CAS problem..CAS checked and works perfectly. just got to get them to spray..
hailers? Aaroncake?
thanks
todd

Aiden671

seems like your ecu is going bad.. or you got some fowled plugs or something

misterstyx69

iTrader: (142)

Check your EGI fuse..if that is shot,you won't get the injectors to Click...I have to ask.did you replace the fuel filter?..(I am thinkin Switched fuel lines.)..For the heck of it.Pull a Plug wire off..and see if it is Firing when you Roll the car over..also .,.Check the plugs to SEE if the Fuel IS there..if it is,then it is not a EGI Problem..(if the plugs are Wet then it is getting fuel and the Car could just be flooded).

HAILERS

See if you have spark or not.

IF you have spark, the fuel injectors should also be pulsing. One follows the other so to speak. The CAS outputs an A/C voltage to the ECU when it spins. The ECU in turn sees that and produces spark and fuel injector pulses to match the spinning CAS.

No spark either? Check and make sure the ENGINE fuse is good in the inside fuse box and the EGI fuses are good in the engine bay.

The small ECU plug is the one that puts a gnd on each injector to pulse it. I'd get a digital meter and key ON, go to the green/white, green/black, green/red and light green wires in that plug (pull small plug OFF the ECU, key ON) and see if each of those wires in the PLUG have batt voltage.

Changed the EM harness on the engine???? Well the ground wires for the internals of the ECU circuitiry is located on top of the rear rotor housing and is a part of that harness that attaches to the engine (EM harness). You CANNOT see those two, black wires on a ring terminal, bolted to the rear rotor housing unless the upper intake manifold is OFF. You have to have those two wires bolted down to the housing.

Try to NEVER use a TEST LIGHT on anything to do with the ECU. They pull too much current. Use a simple digital meter.

If you have a spare CAS, you can connect it to the plug on the harness and spin its bottom gear with the key to ON. As you spin it you should hear the sparkplugs spark and injectors click. You disable the sparkplugs by disconnecting the elect plugs that go to the COIL ASSY'S so you don't confuse sparkplug sparking with fuel injectors clicking. Engine nevers turns when doing this. Just key ON, spin bottom gear on the spare CAS.

I'd only do the spare CAS spinning after confirming that you have voltgage at each fuel injector wire at the ECU small plug and or making sure the ENGINE fuse is good.

HAILERS

One simple way to see if the PRIMARY injectors are working or not, is to attach a LED light like the one in the jpg attached, to the ECU.

You'd leave all the elect plugs on the ECU. You'd take the RED wire of the LED shown in the jpg, and shove that wire up the back of the BLACK/WHITE wire in the small plug of the ECU. That BLACK/WHITE wire should be on the far left of the small ECU plug.

Then take the OTHER LED wire, which is usually black but could be some other color, and shove it in the back of the small ECU plug where the LIGHT GREEN wire is.

Then turn the key to START. As the starter turns the engine over, the LED will light up and turn off each time the ECU commands the injector to open/close.

The ECU small plug looks like the attached jpg. Your looking into the plug from the wire end. You can see the B/W on the far left top and the LG wire in the top middle area. Only the LG and the LG/B wires will pulse when the starter turns the motor over. Primary fuel injectors.

Never use anything other than a LED doing this. No small light bulbs etc or you ruin stuff.

About halfway down this url, you can see LED lights and some part numbers: http://www.teamfc3s.org/info/article...odes/main.html

A LED cost maybe a buck and a half.

dkwasherexd

iTrader: (8)

check the ecu ground to the engine block from the engines wiring harness near the injectors, the injectors spray by the ecus pulses, and check for voltage on the injectors harness, and check the primary injectors, dont mix priamary injector plugs with secondaries, and check the injectors resistance...

t24todd

iTrader: (7)

thanks hailers and others responding..had plenty of spark leading & trailing so thats why it wasnt making great sense to me because i knew the spark and the injecters went off the same pulses by CAS. so i didnt know what next step to approach..injecters are stock cleaned high imp purple top 550cc all around. also when installing the harness i know that you need the imp box down by pass side headlight to make them high for the earlier s4's possibly plugged in wrong..i will check with led though..hope to get her up and going.
thanks again

Napsterfreak15

Sounds exactly like the problem i had when I did my swap

I think your ECU is fine and I think its not your injectors or a fuse.

I think its some weird wiring issue or relay issue. Me and others I've read have had this same problem when swapping and I've never found a solution. Except going stand alone which is what i ended up doing.

Did your friend just swap in a new engine or something or why all of a sudden does his injectors not work??

t24todd

iTrader: (7)

ha yea def not going stand alone right now but yea that would solve and keep alot of problems from arising with that damn old haness..

its always the simplist smallest thing which frustrates me the most

rotorgo

Remove the AFM and try to crank it over. I chased wiring BS forever then I did the diagnostic lights and it threw the AFM code. Unplugged that turd(afm) and the injectors sprayed. Took it apart and I had jostled the plug inside the AFM and broke some of the soldered connections, but the injectors started cycling. I had the same problem, fuel to injectors and spark, but no fuel spraying. Unplugging the AFM is cheap, good luck.

GOT-RTRY

iTrader: (2)

Hey guys, its my car! is there anything under the dash near the blower motor/ecu other than the ecu plugs that would stop my injectors from spraying?? im gonna get an LED from home depot tonight and try your idea hailers. im seriously considering buying the brand new one for $670 because ive screwed around with this car for so long!!

Thanks,
Sean

GOT-RTRY

iTrader: (2)

What do these go to? would they be screwing something up, stoping my injectorsfrom spraying, or could my knock control be bad, its a NA part i never changed when i did the turbo swap

This comes from the dash harness all of the wires are under the dash on the left.


(This Picture is sideways) these plugs come off of the Chassis Harness


These plugs wrap around the fan.


Thanks,
-Sean