1.5jz ms3x need help getting clear VR sync

[MaloneyADHDcray]

Hello,

I'm having a bit of trouble understanding how to get my crank VR sensor sync'd correctly.

Toyota 1jzgte head with 2jzgte bottom end.
using:
factory 12 - 1 crank wheel, factory crank position sensor
factory rear camshaft position sensor.
1zz coil packs

originally i followed the settings posted here
http://jzxproject.com/bbs/index.php?showtopic=8307 in these settings the user set the crank and cam input to falling edge
using these settings and following the manual and ALOT of fiddling with the pot adjusters (roughly 4 turns counter clockwise on the trigger and 5 turns clockwise on hysteria) I was able to get a good clean crank signal according to the tooth logger while cranking. however when I tried to get a good composite log while cranking it showed a lot of sync errors. frustrated and confused i then reached out to someone over facebook from the 1jzgte group. He informed me that when wired correctly the settings are supposed to be set on rising edge and anyone who used falling edge has the wiring backwards.

out of ideas and confident that I could figure out the settings with his help I agreed to set both cam and crank to rising edge.
so i backed the pots out all the way counter clockwise (6 turns) and started over with the settings set on rising edge and assured my wiring was correct. with both crank VR pots turn just one turn clockwise i was able to get a clean composite log while cranking the engine over. however the tooth logger made absolutely no sense to me when i logged it. the manual states it supposed to show a small bar for the normal teeth and then a large bar for the missing tooth. and under these new rising edge settings my log was not at all showing this.

because the composite log looked good during cranking i decided to go ahead and start the engine and log the event. The engine runs but does not idle and rpms go up and down and up and down. after viewing the composite log while running it seems to be going in and out of sync.

after turning both trigger and hysteria pots in one more turn counter clockwise (so both pots in two turns total) i saw little change and decided its time to make this thread.

my questions:
why is the toot logger so wrong looking?
am i supposed to be mainly looking at the composite logger or is the tooth logger completely necessary?
how do i move forward from here?

toothlog2turnsin = cranking tooth logger log

compositelog2turnsin = cranking composite logger log

yeah.csv = composite logger log while engine was running

newest = megalogviewer of the engine running

[MaloneyADHDcray]

here is the tune file and that tooth log mentioned above.

any help would be appreciated.

thank you.

[MaloneyADHDcray]

I would also like to ask.

would it be ok to adjust the VR pots while the engine is running?

[quark2501]

You will need one of them to be on falling edge and one on rising. And change the polarity on the vr sensor on the head.

Don't remember which one on falling and rising. But only one will work.

So correct polarity on crank and switched on cam.

[MaloneyADHDcray]

You will need one of them to be on falling edge and one on rising. And change the polarity on the vr sensor on the head.

Don't remember which one on falling and rising. But only one will work.

So correct polarity on crank and switched on cam.

so by change polarity do you mean swap the sensor wires around?

did you have a chance to look at that tooth log and does that look at all correct to you?

[quark2501]

Jep swap the wires. I had a 1jz running that way, all other options gave sync problems.

somebody else should look at your log.

[MaloneyADHDcray]

Jep swap the wires. I had a 1jz running that way, all other options gave sync problems.

somebody else should look at your log.

do you remember what a tooth log looked like on that set up?
was it 11 small bars for real teeth and 1 tall bar for every missing tooth?

[quark2501]

Should be 12 an 1 big.

[MaloneyADHDcray]

Should be 12 an 1 big.

do you remember roughly how many times clockwise you had to turn the crank pots to get a clear signal.

i'm about to cut up a bmw harness i have and run new shielded wiring to eliminate an issue there.

but that still doesnt fix the tooth log issue.

im working on it guys. any input is much appreciated

[quark2501]

It was as pr. Manuel

[MaloneyADHDcray]

It was as pr. Manuel

after putting a 10k resistor in i am getting a good looking tooth log... but it is ten small bars for every tall bar.

[quark2501]

No resistor is needed for this setup.

[racingmini_mtl]

... but it is ten small bars for every tall bar.

That's what a 12-1 should look like: 11 bars total (12-1) and one tall bar where the missing tooth is.

Jean

[quark2501]

It's not 12-1 but 12/1

[quark2501]

Hmm. Okay sorry I missed that, are you sure you have 12-1 in crank. The 1jz I was running was 12 crank and 1 cam.

[MaloneyADHDcray]

... but it is ten small bars for every tall bar.

That's what a 12-1 should look like: 11 bars total (12-1) and one tall bar where the missing tooth is.

Jean

so a tall bar. then ten small bars. then a tall bar.

thats how a 12 tooth wheel with one missing tooth should look like?

[MaloneyADHDcray]

Hmm. Okay sorry I missed that, are you sure you have 12-1 in crank. The 1jz I was running was 12 crank and 1 cam.

im having no problems with the cam signal. which is just a single tooth little dinger.

crank is a 12 tooth wheel and ONE of those 12 teeth missing. more like cut it have really.

even with the resistor in place im getting noise so i am currently cutting up a different harness so i can run new shielded wire straight from the crank to the MS. away from the rest of the harness.

[racingmini_mtl]

... but it is ten small bars for every tall bar.

That's what a 12-1 should look like: 11 bars total (12-1) and one tall bar where the missing tooth is.

Jean

so a tall bar. then ten small bars. then a tall bar.

thats how a 12 tooth wheel with one missing tooth should look like?

Yes.

[MaloneyADHDcray]

[/quote]
Yes.[/quote]

before i do this.

there is pin on the MS that is for crank pos sensor shield ground wire. should the wire shield be grounded just to the MS on the ECU side or should it also be grounded to the block by the sensor.

or does it matter either way.

Thank you!

[MaloneyADHDcray]

[/quote]
Yes.[/quote]

also do you know if the JZ engines are supposed to be on rising edge or falling edge or does it just depend on which way the sensors are wired....
I think i am over thinking this but its just frustrating getting so much mixed information.