kneel_to_the_rotary69

i posted earlier about this problem and still cant figure out why im not getting spark or fuel, i have looked things over and over and over and still cant figure anything out. this is what i keep getting every time i pull the cas and spin it by hand and see if im getting spark, i only get it once and then nothing, i check to see if i have power to the coils after words and im getting power but no spark what in the world is the problem? im getting to the point of throwing wrenches across my garage, im peeved that i cant figure this stuff out and im good with wires and diagrams but still cant pin point the problem and where it lies. if anyone has any idea of were to start let me know. the motor that currently sits in the engine bay is a tii swap for an s4.




HELP

MazdalicousRx7

my t2 was doing the same thing, i had a couple missing grounds, and my CAS was bad.

kneel_to_the_rotary69

what grounds did you have missing i went and grounded my engine from both sides and still nothing i replaced the cas and i replaced the ecu like 3 times now so i have like three of them lying around and still nothing. this is really starting to **** me off, if you can give me an idea of what you had missing maybe i can start there and figure out what the problem is. thanks

rotary#10

iTrader: (38)

okie does your fuel pump make a wwiiinnneee-ing sound when you put the key in the ON position? another way to test for fuel is to disconnect the fuel hose from the fuel filter in the engine bay and pop a plastic bottle at the end and crank away and see if there is fuel... that comes out.. if not your pump is dead or wiring is bad from the relay to the pump.. etc

kneel_to_the_rotary69

yes my pump is good i have tested that im getting fuel to the rails but not farther then that, as for the no spark im lost i cant figure out why im only getting one pop from the coils when i spin the cas by hand, i know that if im not getting signal from the cas to the ecu im not going to get a pulse from the injectors. with that said anyone have any idea of why im only getting one pop i have grounded the engine from both sides and secured nicely..... so once again i have fuel to the rails, its pumping fuel but im not getting anything past the injectors.

xodaraP

If you get one spark and then nothing could be bad coils? Bad plugs? Tried replacing either of those? Hell it could even just be bad plug wires.

kneel_to_the_rotary69

good point it might be them but i have spares lying around and i tried both sets and i still get the same thing, ill try and see if i can get ahold of another set and try them out and see what my results are. my plugs are new, and so are my wires but then again things can be faulty right out the box.

rx7_FREAKKK

iTrader: (1)

You might have made a few grounds to ground the engine. However there is still a wire that grounds to the UIM for the ecu. Ecu wont power up if thats the case. will the horn honk?

kneel_to_the_rotary69

no the horn wont honk? what does that have to do with my no spark problem? this **** is confusing as hell. so can i just pull my harness off and run a new ground wire from the ecu to the engine, that would mean that i would have to take the whole harness apart and run new grounds to all the sensors and the ecu and thats not a problem. but i also forgot to mention that im running an n/a harness on this tii swap, if you guys have any ideas let me know im willing to hear for more info on this.

rx7_FREAKKK

iTrader: (1)

that might work. get that horn to honk then you know the Ecu has power. Ecu runs the horn ya know,

look for that ECU ground wire. its hanging around somewhere

kneel_to_the_rotary69

**** didnt know that. its something worth looking into. thanks man ill look into that if you have anything else worth looking into let me know.

rx7_FREAKKK

iTrader: (1)

should be a round copper deal coming off the harness itself. not sure you can see it if the UIM is on

kneel_to_the_rotary69

ill see if i can pin out the ground from the ecu instead of tearing everything apart ill just run another ground wire and splice it in to the original ground and ground it to the chassis. instead of having to deal with the pain in the *** taking apart of the uim.

rx7_FREAKKK

iTrader: (1)

Did the horn work before? just making sure

rx7_FREAKKK

iTrader: (1)

This is sorta like the price is right... Get the horn to work you gotta car :P

kneel_to_the_rotary69

yea the horn worked before. this is the play by play of what happened in the time that had the n/a motor in to the tii swap.. i rebuilt the n/a put that in it ran but then i got bored with it and bought a tii, i took out the n/a everything was in proper working order. until i dropped the tii motor in from there on out i have been having problems with no spark or fuel, the funny thing is that i had all of that when i had my n/a in there now i have nothing. i did however power wash the **** out of the engine bay when the motor was out dont know if that could have caused the problem with something or not but i dont get how the battery was unplugged i had nothing to give it power to short anything out.... but to answer your question yes it did work before i put the tii motor in.

rx7_FREAKKK

iTrader: (1)

Was the key on and the Lights on the cluster on when you tried the horn?

kneel_to_the_rotary69

nope, the key was on but no lights in the cluster didnt have them on. ill have to try that and see what i get. im going to be going home, here shortly and trying that if i do get something ill post and let ya know.

kneel_to_the_rotary69

nope no horn. i still dont know how the ecu controls the horn, its controlled by two wires a positive and a ground so i have no idea how that would effect my no spark problem? the horn seems to not be the problem it might be something else out of the ordinary that i might have missed. but any ideas im welcome to all of them.

Fc3sDreamer

https://www.rx7club.com/showthread.p...light=tII+swap

a nice write up on a tII swap, may help for reference to see what you might have missed.

Black Knight RX7 FC3S

iTrader: (7)

check the crank angle senor by checking the resistance between the G1 and G2 terminals, and the Ne1 and Ne2. it should be 110-210 ohms
Crank angle sensor basically controls the injector firing and ignition so check all 4 wires to see if it has continuity all the way to the ecu. The wires are Green, Blue, Red, White. It connects to the big plug on the ECU. Pin 1N is green, 1P is Blue, 1T is red, and 1Q is white.

When you turn the key, does the main relay click? To be sure check the main relay fuse at the driver side shock tower. With the key to on, check the Black/white wire on the main relay 2 pronge plug for 12 volts. if you got power, then check to see if the main relay is good by checking the continuity between the pins of the 4 plug. Check to see continuity between terminla A and B. And then C, and D. If you have no continuity then your main relay is bad.

make sure your ecu is grounded effectivly and also, the horn is not controlled by the ecu, its contrtolled by the cpu

Also, to answer you question in the other thread, the injector resitance will only come in on fc that are made before june 1987. If your TII engine is made after that, you dont need the injector resistance box or any for that matter since its high impedance. Youd only need it if you have low impedance injectors. if you dont know what year yout TII engine is, to check to see if you need the resistors, youd have to check the injector themselves. If the notch is offset, then its high impedance, if its centered and square then its low impedance, though there are some injectors that doesnt follow this, so youd have to use a multimeter and ohm it out. If the ohms are around 3 ohms, then its low impedance and youd need the resistance box. If its around 13 phms then its high impedance and you wont need the box.

kneel_to_the_rotary69

cool, i looked over all that i came up with this. 1. my cas is new so thats not the culprit, my egi main is pulling in everytime and i still cant get nothing more then one pop from the coils when i spin the cas by hand, after that i get nothing no spark nothing. my injectors are high imp. anything else that i can test to see why im only getting one pop.

rotary#10

iTrader: (38)

ummm what are the stock s4 t2 at impendce wise ?
You may have the wrong impedence on the injectors... ( just a thought from preivious exp)
once like an idiot i ran s4 n/a injectors in a s5 n/a... s4 and s5 have different impedence.. s4 low.. s5 high... thats on n/a's though

rx7_FREAKKK

iTrader: (1)

My bad. Keep getting Ecu and Cpu all messed up. Still there has to be a way to make sure the ecu is getting power though! Also is the s4 and s5 Crank angle sensors the same? are they interchangeable

rotary#10

iTrader: (38)

check the part #'s