boosted414

iTrader: (30)

So im finishing up a swap, and it does not start. The tach jumps 1 time for every 3 turns of the CAS. While checking pinout connections at the ECU the IGs-T wire does not have 4.4v, IIRC it has 0. Is this symptomatic of a bad coil? It has 12 volts on both black/yellow wires at the coil itself.

Also the vehicle does not have an atmospheric pressure sensor (the one under the dash in the kick panel). What issues would this cause?

Every other pin I checked at the ECU has come out properly (vref, afm, tps, leading coil).

Thoughts and ideas?

HAILERS2

I'm pretty sure the atmospheric pressure sensor defaults to a sea level reading. I doubt you'd notice any effect living in Chicago.

EDIT: I looked and that is the case. I guarantee that is not a reason for the car not starting.

What do you see with a meter at the ECU on pin 3B when the key is HELD to Start? Should see approx 8-12vdc when the starter is turning over. IF not, then your problem could be simply that the ECU isn't seeing the START signal and is not delivering enough fuel during STARTING. Also is the water thermo sensor seeing??? 1-3vdc? or what is it seeing cold in YOUR case?

IF not seeing the START signal on 3B........try some starting fluid sprayed for two seconds into the air filter/snorkel.

K-Tune

iTrader: (26)

My starter signal to ecu wire has been non-existent for years..still starts ok.

HAILERS2

Also on JDM swaps into USA.............the fuel line attachment at the engine is different. Swap the two lines at the engine........pressure and return lines. Make sure the Return line is sending fuel back to the fuel tank when the fuel pump is continuously running. It should. If not, then the fuel system is crossed up somewhere. Last item before returning to the fuel tank is the FPR on the fuel rail.

boosted414

iTrader: (30)

It's not fuel. My tach is only reading a third of the signal it should be. 2 of the 4 wires going to the ecu from the trailing coil pack are direct and proper. The other 2 don't read back to the ecu. I'll explain more when I'm sober. Received bad news regarding someone close to me and their degenerative condition.

HAILERS2

And you live in a WARM climate that does not vary that much.

HAILERS2

I reread your first post.

I'll check one of my cars tomorrow...........but that is the Select signal for the TRAIL coil assy. The select signal decides which of the two coils in the trail coil assy gets fired. Only one ignitor for two coils. That's two trail coils that do NOT fire at the same time.

From an article I read on a forum the ignitor decides which to fire by the rising and falling of the input on the IGs-T wire. It will fire one of the coils when the voltage on IGs-T rises TO 5vdc and then fire the other one when the IGs-T falls TO zero vdc. Unlike the Lead coil assy those two trail coils fire seperatley from each other and it does it by one firing at 5vdc and the other when seclect voltage hits 0 vdc (repeated myself...again).

I'll try to find that article on the web and post it later sometime.

RX start and idle fine with no trail coils firing at all.

I'd be more interested in what you see on the LEAD coils G/Y wire as you turn the engine by hand while watching the volt meter. The reading should rise and fall from zero to five vdc if memory serves ......once every eccentric shaft revolution.

I've long since forgotten what 1U reads with engine OFF key ON. I might check tomorrow sometime for the practice.

EDIT: the article was on Team FC3S site which is no more, and the article was named De-mystifying the ignition system.........or something similar. Wish I had made a copy now that's its gone.

Usually holding a CAS in your hand with it connected to the harness with key ON and spinning the gear on the CAS can determine if the trail or lead coil is working. Just maybe pull the sparkplug wire out of the coils bore and rest it on the edge of the coil bore and spin the CAS with key ON should result in spark at the bore of the coil assy. Don't have to spin the CAS gear very fast at all to see this. Try that with your spare CAS connected to the harness.

HAILERS2

I did a GOOGLE and found it here: http://rx7.pw.cx/guides_manuals/coll...ystifying.html


And all three of the wires b/t the ECU and the Trail coil assy are in the Front harness with no connectors inbetween whether series four or series five.