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I assumed the tach signal is triggered by the kickback of the coil, like igf. The rise of the signal had a very similar slope as igf. I'll overlap these and see if they are triggered at the same time. I'll see if I can get a misfire while keeping the engine going. One cylinder down is stable...

Thanks for the support guys. As a few have mentioned, it's more proof of what is. Visualization helps connect the theory to reality, at least for me. One of my profs used to hammer it home that learning is done through emulation and understanding. See the outcome, understand why and how then go...

Well it's odd when I review the scope images with parallel or reversed connection. It's like only one coil is charging. Might be how the secondary is connected. I've seen pictures showing secondary grounded through plug but hooked up to the 12v b+ too. Guess the idea is to keep the voltage...

Now for the goods on the ignitor dwell and coil charge. Stock 7mgte coil: Charge time is between 2.9-3.1ms but fluctuates a bit depending on temp. charging ramp/curve. 100mv = 1amp. Yellow = current Blue= voltage burn time at idle. IS300 coil: Charge time is rather...

Stock ignitor operation: -IGT is the signal from the ecu telling the ignitor to fire the coil at a precise crank angle. This is the trigger for the ignition event and is the timing angle control signal from the ecu to the ignition coils. If the ecu calls for 30 degrees of timing, this...

Close but the transistors that turn the coils on are in parallel. So it's only dealing with 7 ish amps at one time. There are three transistors in parallel. Still one stout device. Under hood temps aren't even remotely friendly of electronics. The whole case is a heat sink

I did, lol. Cant sleep when something goes unanswered! Ran the ford coils with polarity hooked up both ways in parallel and in series. Only way it works is if the 12v+ is on the right pin and they are in series. Swapping polarities drastically reduced the charge time but missfired when free...

Why wouldnt this occur with them wired in series, 12v is still shared across all the coils and the injectors on this leg of the power circuit.

hmmm thats odd. The total current will not exceed 7.5 amps. Technically, if the coils are matched or closely resemble each other electrically, each one will consume 1/2 the 7.5 amps. exactly how the injectors are wired on the stock 7m. might be the difference between the coils that caused...

^ No Problem. Im going to start another thread in the next few days that will cover all of this and what I have found about the ignitor and all its signals. Clever little device! in the mean time, the ignitor current limits to 7.2-7.6 amps (limit of mV range (X) of waveform i saved) Call it...

I need to organize the scope images a bit before posting them. Way to many measurements that can be shown off one image. Makes it a cluster to see things. The short story is this. Im almost certain the ignitor performs current sensing. A block of dwell time is provided that should allow the...

AMP makes most of the connectors. Technically they are alternatives and use a newer style terminal but the stock terminals will fit and lock in place with out issue. TE now owns AMP. Summitomo made the harness for toyota. The problem is finding the connectors readily available from...

if any body has an extra 2jzge coil or 2 of the ford coils they wouldnt mind letting me borrow for testing, pm me. Really curious to see how other coils work with the stock ignitor.

Had some time to scope the ignitor. Dwell, defined as the period that the coil is shorted to ground, does in fact adjust for increased rpm. At idle, dwell starts around 20-25 degrees before the ignition event occurs. This is longer than the IGT signal! As rpm increases the dwell angle is...

I've never seen any hard data for the stock coils posted before. Guess anything a little less baked than the stock coils could be better. I'm looking at picking up a secondary probe so stock coil output can be verified.

Have you guys scoped these compared to the stock coils? Inductors in series are added together, 1/2 the current per coil. Do you know the impedance and inductance of these coils? Safer for the ignitor but im curious how much charge the coils are really getting. Whats the dwell time that ford...

Maybe it's not cryptic. Maybe the issue at hand has several potential answers. Answering his question may force you to research and understand the systems in the 7m more in depth. Making your future trouble shootings easier.

Care should be taken when considering what fluid and what effective pressures an inj was flow tested at. For example RC 550's flow 550cc at 43.5psi effective pressure. Stock 440cc's run at 36.5psi effective pressure. So at 43.5psi, stock injectors should be flowing 477cc. Never seen a flow...

Getting used to the new scope and found this on the B+ line at the ecu. Car was at warm idle, minimal electrical load. DC+AC coupled probe with no freq limiting. Its a consistent transient. DVM measured warm idle is a stable voltage of 13.8-13.9v even with a 30 amp load...

TPS tip in enrichment might help. Timing transitions play a big role at take off from my experimenting. I've noticed a few degrees can make or break the starts on my car. Im a 5spd though so manuals may load the engine a bit more in this area. You might take a look at the timing maps 3P has...