Relay Board w/7 pin HEI Module

[Bender142]

I'm attempting to wire up a 7 pin HEI module and I'm using the relay board. After combing through the manual it looks like I should do the following:

1. Jumper the "V" hole in the relay board to provide +12V to drive the relay
2. Hook up the terminal "B" (from the HEI) to the Fidle (6) on the relay board

Can anyone verify this?

For the record, I'm running a V3.0 MS-II w/2.888 code on a TPI'd Chevy V8.

Thanks

[Matt Cramer]

It would be better to set it to provide a ground, then put a 1K resistor between the TPS VREF and FIDLE terminals.

[floppy]

I have the B-pin of the HEI wired to the Fidle output on the relay board and the port configured to provide voltage after the rpm >500. I jumpered GV to the vref on the relay and have verified 5 volts at the fidle .

I can make the port work, as I understand it there should be no voltage during crank and vref over 500. Correct?

5 volts to the B-pin kills the motor???

Thanks, Mark

[Matt Cramer]

Make sure your output settings are correct. Check to see the spark output settings are right and the trigger angle is something reasonable (usually start at around 10 degrees).

[floppy]

Thanks Matt,

Should the trigger be my initial advance at 16 degrees? - Mark

[Matt Cramer]

The trigger angle will depend on how your distributor is aligned.

[floppy]

Matt,

I have checked my port settings and verified that I have no voltage to the b-pin during cranking and 5 volts when running.

Actually the B-pin isn't connected, I am jumpering it during this testing.

I have looked at many other peoples msq's and read through the manual and can't get a grip on why it dies when vref hits the B-pin. The trigger angle(ie:Trigger Offset degrees- right? ) is at 16 degrees which matches the timing light, again without the vref attached. Experimentation with this setting didn't really get me anywhere.

All of the logs get wacked when I jump the vref onto the running motor. Looks like it is momentarily shutting down the controller because the engine goes to 0 and then back through crank, WUE,ASE and IAC. Unfortunately there are so many things bouncing around I can't tell where the cause is coming from.

Also checked is continuity on the B-pin wire from connector to Fidle to verify no short.

Thanks, Mark

Would you mind taking a look at my msq and msl? I suspect I am missing a simple setting somewhere.

[Matt Cramer]

This is a bit unusual. How exactly do you have your RPM input circuit configured?

[floppy]

in MS, wiring ,or pcb?

[Matt Cramer]

In the MS hardware.

[floppy]

I'll have to check it out tonight, What would you expect? Thanks

Recall that I had to jumper D2 to get rpm signal.

[floppy]

So I double checked my MS set-up:
-Hall circuit per step 50
-r12 and r13 and c11 installed
-c12 and c30 empty
-d1 newly jumped (no difference noted)
-d2 jumped
XG1-XG2 jumper
-OPTOIN to TACHSELECT
-TSEL to OPTOOUT
-JS10 to IGN

verified that there is 0 voltage during crank and 5 volts when rpm>400.

Starts and runs fine until touching the wire to B-pin to vref and everything goes wacky.

[Matt Cramer]

If you attempt to crank the engine with the B pin attached to VREF, what does your timing look like? Might want to unplug the injectors for this test.

[floppy]

I'll give it a shot tonight with a datalog. Not sure that I have tried to start with it connected. Thanks

[floppy]

Same deal as before. check out the datalog-- Mark

[Matt Cramer]

So it starts and cranks, but the tach drops out above 900 RPM or so?

[floppy]

Pretty much, If you look at the engine log it is as if it is restarting over and over. Although it doesn't alwoys drop back to 0. It goes in an erratic cycle like 3,13,29,19,13,3,13,0,3,13,0,13,3???

I'm starting to think the module may be shorting out?

[Matt Cramer]

Could be a faulty module; I've seen that happen before.

[floppy]

Well, it's not the module. I have tried 3 of five with the same results. I developed a ground issue along the way and fixed that. It was resetting like crazy. unfortunately it was just a brief distraction.

Ive been looking at others msq's and rechecked the wiring numerous times. Verified again that the Fidle port is set correctly and putting out the vref after crank. Could something be grounding or picking up noise from the vref or other source?

shot of ignition issue.jpg

Should I post this in ignition tuning? Kinda took over Benders post.

Thanks, Mark

[Bender142]

FLoppy,

No problem on the post, it's all yours. I just smoked my relay board and have finally had enough. I'm going back to a carb for now, this project has taken way to much time and I need the vehilcle.

Wanna buy a ms-II V3 REALLY cheap!