all_about_imports

ok now i have changed the coils and the ecu the plugs the wires and the harnesses to the coils what else might possably be causeing me to get no spark

RotaryRocket88

iTrader: (7)

How are you checking for spark? By pulling a wire off while cranking, or timing light?

all_about_imports

i pulled a wire and i was holding the metal and the neg battery cable while someone turned it over if it worked i would have gotten one hell of a shock

Sandbagger

Are you S4 or S5?

I had a similar situation when I connected my fuses in the wrong order. (fuse box in engine bay) Apparently S5 and S4 are different.

The S4 has 2 fuses for ign and egi, where the S5 uses a single fuse. Verify that you have them installed correctly.

Did you swap motors at all? or is your car on a factory motor? If you did a swap, maybe you missed a plug when you connect your harness down by the fire wall?

all_about_imports

no its an s4 and there is no swap all i did was charge that stupid pulsation dampener out with a banjo bolt because it was leaking gas it ran before hand and now nothing i took off the intake down to the bottom fuel rail and put it back together someone said it was a ground but couldnt tell me where this magical ground is so i tore it apart again and i didnt find anything unhooked its driving me crazy and im about to just let it go to the scrap yard

all_about_imports

oh come on people any lil suggestion would help

rx7_FREAKKK

iTrader: (1)

I now have a silly idea.. Wonder if a Timeing Light will work with the Injector wires to pick up the signal?? That would be cool...

Just for kicks Undo the spark plug wire at the COIL and hold it back from the coil and have someone crank it over and tell me if it jumps?

all_about_imports

nope still nothing

HAILERS

Can't be fixed without using digital meter.

You turn the key ON......that feeds the ENGINE fuse......which in turn pulls in the MAIN RELAY......which in turn feeds power from the two EGI fuses to .........feed the ECU, injectors and lead/trail coil assy's. You then spin the engine and the CAS outputs a voltage to the ECU which sees that and pulses a gnd signal to the coils to make them fire.

The ground wires for the INTERNALS of the ECU are on a ring terminal on the rear ROTOR housing and can be seen on Aaron Cakes home site. It's *ring* terminal* with two black wires on the ring that gets bolted to the rotor housing. Only can be seen by removing the upper intake. Or verifiyed by looking at the gnd wires on the small plug of the ECU with a meter.

The ECU gnd is also shown in the attached jpg. It's not bolted down in that picture.

SirCygnus

iTrader: (1)

try the airflow meter. unplug it and try starting the car.

all_about_imports

ok so you guys are basically telling we there is no real reason that i have no spark

rotary-guy

iTrader: (24)

CAS plug connected? just a quick thought.

Zanity

iTrader: (1)

we accidentally found a way to check.
not sure if its bad for your car or not though.
take plug wires off coils and crank.
we saw the sparks clear as day.

grounds, on our s4 n/a's not sure of yours.
are on driver's side strut tower thing.
one also closer to the driver.
and the third is back near or on the clutch slave cylinder.
i think.

HAILERS

Your not telling us what voltage your seeing at the coil (small wires held down with nuts on the coil assy) and not telling us what voltage your seeing on the small plug of the ECU. See the FSM, FUEL AND EMISSIONS SECTION, SUB SECTION CALLLED CONTROL UNIT.

Then follow the words on those pages. Match what your seeing with what is called for in the section called CONTROL unit. Just doing that small plug on the ECU should tell volumes.

I forget if it's been mentioned, but do you see small bumps of the tach needle when you spin the engine with the starter. Should. If you do, then there is spark. Can't have the tach needle bump and not have spark (at least on the Trail coil assy).

all_about_imports

ok so i got it fixed it was a combo of problems ecu was bad maf was bad and coil harness was bad and no that i think about it i am kinda lucky i got the stupid thing home to begin with oh well she is running now and i just gotta tune her

SirCygnus

iTrader: (1)

told you it was the maf. those things are notorious for causing the coils not to fire, yet every thing checks out perfectly, it just prevents them from firing.

all_about_imports

well thank you but like i said it was more than just that it was also the harness and a cold solder point in the ecu i tested the maf right after you said that but it didnt work at that time

lovemyRX7

what kind of plugs and wires did you get?