Wiring help - Coil +12v

[Chrisso]

CAR - ae86
MOTOR - 4age
USE - daily
PROBLEM/QUESTION - I need a close up photo of the wiring to a stock 4ac coil. From looking at the EWD I should have a Black-Orange +12v usually run through the resistor, and a Red cranking +12v and a Black coil -ve to tacho. Just wanted to make sure I've got this right.

OCCURS/STARTED WHEN - Started when I undid shit without taking photos first. Lesson learnt!
PERSONAL SITUATION - No spark = me cranky!

[Nikkojoe]

Im confused, 4age motor? 4ac coil?

Wont work...

4ac use resistor, 4age use igniter

But what you are saying is correct for a 4ac coil, providing you are running a 4ac

[Chrisso]

I'm using a 4age coil, but I'm not using the ignitor because the megasquirt controlls the dwell and timing. I was just checking that I had the right power to the coil and the right feed for the tacho from the -'ve'.

I put the timing light on it this morning and it was sparking away (cranking at 240rpm), just can't seem to get it to start though.

[Skylar]

Yeah, what you said is right.

Post up/send MSQ file? Still running 3 wire CAS with MS in batch fire injection? 12-1 or 24/4? MS2 I presume. So 24/4 or 24/1/1.

Dwell time not long enough? and It is timed correctly yeah even with the motor not starting?

[Skylar]

oh, and get rid of the resistor.

[Matt-AE86]

Give it juice straight to the +ve on the coil. 12v Igniton wire to the Left of me, Coil positive to the right, here I am, stuck in the middle with you.

[Chrisso]

I haven't got a resistor there as I've ditched the ignitor (the resistor should be part of the ignitor in the 4age setup). It's getting a good 12v on crank and run.

It's a standard bigport dissy using the NE signal in a 12-1 format by grinding two opposing teeth off the 24 tooth wheel. It is an MS2 V3pcb, batch fire for the injectors.

Timing should be good. I bypassed the ignition yesterday and cranked it with a timing light going and set it to 10*BTDC. This is also the base figure in my trigger offset setting and the base figure in my spark advance figure at low RPM and Load. I just want to double check that I've got it on the compression stroke because I had to take the dissy out and roll it over a couple of times to get the timing where it should be!

My cranking pulse widths are a little under but I had a couple of attempts with them turned up but no love. They're currently about 11.5ms cold and 3ms hot, required fuel calcs 14.3ms.

Dwell is at the base setting and I haven't adjusted it for starting yet.

I'll have a crack this weekend with a couple of different settings and possibly a can of start ya bastard. I need to calibrate my TPS too.

I can't seem to attach my msq, but here's a link to it in msefi.
http://www.msefi.com/viewtopic.php?f=89&t=35167

[Skylar]

Is this fuel you have from the cold start injector and not your port injectors?

You have spark but how strong is it. We've had visible spark before but not strong enough to start the engine with. Maybe try turning up dwell time but keep checking coil temps.

[Chrisso]

The fuel is from the port injectors. I don't have the cold start injector running at the moment as I've got ITBs and no where to put it for now.

I was going to look and see if I could find some info on optimal dwell time for the 4age coil, but I think you're right. It might just not be hot enough. I've got a spare coil, so if I accidently burn one out no big problem.

[Skylar]

What's dwell set to now? 3ms is common for 1zz cop, I think, but 4a coil being bigger might need a longer time to charge?. Then you've got battery voltage dwell correction which you might need to turn up so you have longer dwell time when the battery voltage drops from cranking.

Also, pain is a good indicator of spark strength. :D

[Chrisso]

Found myself a gold mine last night. It's using MS Extra code, but the engine settings are the same, but I don't remember seeing a cranking dwell setting in MSII.

http://www.diyautotune.com/diypnp/apps/n42/usdm-toy-corolla-8589-4age-mt.html

[Skylar]

I don't think there is. I'm confused as to which software I'm looking at but I think it's MS2. Just use the battery voltage dwell time compensation to increase dwell time as battery voltage drops from cranking.

Remember to leave your trigger settings at 12-1 as that will run 24/4.

Thanks for the link. I never looked into the pnp stuff because I was planning on making a loom anyway.

[Chrisso]

Re-adjusted my timing this morning, took off the intake cam cover and the dissy cap and refitted everything. Turns out I was 180* out. I used a squirt of petrol down the throttle bodies and tried cranking and it fires up straight away. I can't keep it running though.

It would appear from that that it's not getting enough fuel at cranking or run. I can keep turning up the cranking pulsewidths, ASE, and WUE, and pump up the VE table, but it just seems like I'd be taking the settings past where they should be.

I've posted my MSQ and data log in the thread linked above.

If DIY had had those PNP's around when I got started I would have seriously considered one. I just hacked a FWD loom, kept the original Toyota ECU plugs. It works pretty well and is neat. My concern was also around being able to tuck it away as I want this road registered.