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Thanks Dave, I gave that a shot. Unfortunately, still no luck. When I turn the car to run, the RPM gauge in MegaTune will show '1' briefly, then go to zero. Same thing during cranking.
I am now starting to post on the MS forums; will hopefully get some further information.
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Tweedledumber
I have had the Adaptronic triggering directly off the distributor rather than the coil -ve.
Martin Gutkowski
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Very part time DeLoreaner...
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MS actually recommends tach signal from coil if doing fuel only control.
I don't think the source of the signal is the problem - using my multimeter, I can read tach signal from the relay board's terminal strip port for the tach signal. The relay board is a separate unit from the ECU; it centralizes all of the wiring.
So, the relay board IS getting tach signal, but it seems like it isn't reaching the ECU. Odd, very odd.
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EFI DeLorean
Trace the ignition circuit on the Megasquirt board. Perhaps you have a bad solder joint. Particularly pay attention to whatever jumper you used to identify tach select.
Jim Reeve
DMC6960
D-Status: - Getting some Spring exercise
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Its a pre-assembled board, so I didn't build it. According to diyautotune.com's website, it comes jumpered for coil (-).
I currently have a stimulator on order to test with. It has to be something with the ECU because I can read the tach signal at the relay board's tach port on the terminal strip.
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Senior Member
How do you have your tach trigger set up? There are separate jumpers for the VR vs optical circuits, VR is for coming off the distributor and optical is for the coil terminal. Your unit is prebuilt so it may be set to VR as I think that's a lot more common. Open the case and check it out.
Not sure which board you have so the jumpers may not be where I'd expect, but the boards should be VERY clearly labeled.
From the manual:
52. Select the tach input circuit with jumpers:
For the VR sensor:
Jumper VRIN to TACHSELECT on the bottom side of the PCB (near the DB37, opposite the heat sink.)
Jumper TSEL to VROUT (Or VROUTINV if you want the VR input to be inverted) on the bottom side of the PCB, near the center.
OR (Do NOT install both sets of jumpers, chose one set or the other!)
For the Hall sensor, optical sensor, coil negative terminal or points:
Jumper XG1 to XG2 on the bottom side of the PCB, near the 40 pin socket,
Jumper OPTOIN to TACHSELECT on the bottom side of the PCB, near the DB37 connector, opposite the heat sink.
Jumper TSEL to OPTOOUT on the bottom side of the PCB, near the center.
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From the diyautotune.com website for the pre-built unit:
Hall Sensor/Coil(-) and VR Sensor Ignition Trigger Components (jumpered for Hall sensor, optical sensor, points, or fuel only using negative coil input- you can reconfigure for any input you like)
I opened the case, and I saw a jumper on XG1/XG2.
I couldn't find the optoin or tsel parts of the board.
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EFI DeLorean
Do you have a 3.0 board or a 3.57 board?
Jim Reeve
DMC6960
D-Status: - Getting some Spring exercise
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Senior Member
Originally Posted by
opethmike
From the diyautotune.com website for the pre-built unit:
Hall Sensor/Coil(-) and VR Sensor Ignition Trigger Components (jumpered for Hall sensor, optical sensor, points, or fuel only using negative coil input- you can reconfigure for any input you like)
I opened the case, and I saw a jumper on XG1/XG2.
I couldn't find the optoin or tsel parts of the board.
They may be on the underside.
Hmm, that is weird. Try setting your software trigger to basic trigger instead of fuel only? I had this problem once and that fixed it.
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Originally Posted by
dmc6960
Do you have a 3.0 board or a 3.57 board?
I have a 3.57 board.
Originally Posted by
AdmiralSenn
They may be on the underside.
Hmm, that is weird. Try setting your software trigger to basic trigger instead of fuel only? I had this problem once and that fixed it.
I haven't tried basic trigger yet. If that works, I will be very happy. Thanks for the suggestion, I will try it after work today.
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