sync loss
Moderators: jsmcortina, muythaibxr
sync loss
PS: FIXED. Post #16 shows how. For future reference.
Hey guys.
The engine is a non-vvti (12 crank + 1 cam) 1JZ-GTE.
I've been trying to get it running right and it does idle at around 500 with no sync loss Although it sounds like it's running on 3-4 cylinders and it shakes a lot.
But as soon as I try to gas it it crackles and pops and loses sync.
Tried adjusting the VR pots for cam and crank but nothing changed.
Timing is set on cyl 1.
Attached are the MSQ, and logs. I had the timing set to fixed 10 but with variable timing it still does the exact same.
Ideas?
Hey guys.
The engine is a non-vvti (12 crank + 1 cam) 1JZ-GTE.
I've been trying to get it running right and it does idle at around 500 with no sync loss Although it sounds like it's running on 3-4 cylinders and it shakes a lot.
But as soon as I try to gas it it crackles and pops and loses sync.
Tried adjusting the VR pots for cam and crank but nothing changed.
Timing is set on cyl 1.
Attached are the MSQ, and logs. I had the timing set to fixed 10 but with variable timing it still does the exact same.
Ideas?
Last edited by ali_bas7 on Tue Nov 10, 2015 12:19 pm, edited 2 times in total.
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- Super MS/Extra'er
- Posts: 6828
- Joined: Sun May 15, 2011 11:41 am
- Location: Walnut Creek, Calif. USA
Re: sync loss
"The engine is a non-vvti (12 crank + 1 cam) 1JZ-GTE."
The MSQ is set for a 36-tooth crank wheel. Why?
The MSQ is set for a 36-tooth crank wheel. Why?
Re: sync loss
It's set to 12. Looking at it right now.billr wrote:"The engine is a non-vvti (12 crank + 1 cam) 1JZ-GTE."
The MSQ is set for a 36-tooth crank wheel. Why?
"Trigger Wheel Teeth(teeth) 12"
Re: sync loss
il confirm the msq posted is set to 36, how many teeth are there meant to be on the cam input btw??
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
Re: sync loss
My apologies. Uploaded the wrong file.
Fixed now.
It is a single tooth.Indicating #1 TDC.
Fixed now.
It is a single tooth.Indicating #1 TDC.
Re: sync loss
the comp log shows like 4 teeth on the cam
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
Re: sync loss
That's the problem.
It's just 1 tooth and I used to get clean and even signals. Then all of a sudden it became like that.
Tried flipping the 2 wires and nothing changed.
There is also another that marks a different angle. I'll try that one and see how it goes.
In the mean time any input is appreciated.
It's just 1 tooth and I used to get clean and even signals. Then all of a sudden it became like that.
Tried flipping the 2 wires and nothing changed.
There is also another that marks a different angle. I'll try that one and see how it goes.
In the mean time any input is appreciated.
Re: sync loss
have you adjusted the pots on the ms3x card
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
Re: sync loss
yes. Went up and down on both until it started getting worse.
What is odd is that it worked perfectly before!
What is odd is that it worked perfectly before!
Re: sync loss
what type of sensor?
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
Re: sync loss
VR.
UPDATE: Running on all 6 now. I connected A-F like 1-6 but guess it can only fire A,B,C,D,E,F so that's fixed.
Got a clean idle. Still won't rev. Got a new comp log for you guys indicating the proper idle sync and sync loss at higher RPM.
Adjusted both Cam trimpots several turns. Going up made it worse, going down didn't affect it. Going to the other cam sensor didn't affect it either.
Any JZ guys on here?! Everybody uses the rear, which I'm using and is working fine.
UPDATE: Running on all 6 now. I connected A-F like 1-6 but guess it can only fire A,B,C,D,E,F so that's fixed.
Got a clean idle. Still won't rev. Got a new comp log for you guys indicating the proper idle sync and sync loss at higher RPM.
Adjusted both Cam trimpots several turns. Going up made it worse, going down didn't affect it. Going to the other cam sensor didn't affect it either.
Any JZ guys on here?! Everybody uses the rear, which I'm using and is working fine.
Re: sync loss
UPDATE 2:
After a moment of getting mad at the car, I realized that I just have a dead spot at around 1500rpm. If you get some momentum, it will go past that and stay comfortably there. I went up to 5000rpm (no load) and it was alright.
I also get mapSample error as it does that.
Any ideas?
After a moment of getting mad at the car, I realized that I just have a dead spot at around 1500rpm. If you get some momentum, it will go past that and stay comfortably there. I went up to 5000rpm (no load) and it was alright.
I also get mapSample error as it does that.
Any ideas?
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- Super MS/Extra'er
- Posts: 17507
- Joined: Thu Apr 16, 2009 8:08 pm
Re: sync loss
You have a problem getting a clean cam signal. What MS3 variant is this?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: sync loss
DIY Ms3x 3.0
And I'm using the stock shielded wire and the shield is grounded too.
The zx testpoint is at the min and is showing .58v. Can i add a resistor to lower the voltage some more?
And I'm using the stock shielded wire and the shield is grounded too.
The zx testpoint is at the min and is showing .58v. Can i add a resistor to lower the voltage some more?
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- Super MS/Extra'er
- Posts: 17507
- Joined: Thu Apr 16, 2009 8:08 pm
Re: sync loss
I would see if there's a "sweet spot" on the VR trim pots before trying to add resistors.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: sync loss
Update:
FIXED. The problem was not the cam, contrary to what the comp logger was showing.
Reversing the polarity of the crank VR wires and changing the "ignition input capture" to "rising edge" fixed it fully.
Thanks for the help guys.
Time to tune!
FIXED. The problem was not the cam, contrary to what the comp logger was showing.
Reversing the polarity of the crank VR wires and changing the "ignition input capture" to "rising edge" fixed it fully.
Thanks for the help guys.
Time to tune!