SMC 1.92 Won't start?

[Kelly2264]

I've got a problem with my SMC. I've changed it over from 60-2 to pulse-per-cyl. It is a 4 cyl. aircooled VW. I ran the mode flag program and have reset the flags as needed. I'm able to get the timing light to match the software by using the cylinder pulse offset in M1 Engine Setup, but the engine won't start up. It will pop and sputter, but not continue to run. When I hold the throttle open slightly to get it to rev, it acts as though the timing is MEGA retarded. Another issue that is happening that wasn't before is the Cylinder Pulse 1, 2 & 3 are red in the software. The car has run before and this is something completely new.

The values are...
Cyl. Pulse 1 129.635 mSec
Cyl. Pulse 2 140.822 mSec
Cyl. Pulse 3 129.150 mSec

I don't know if this has something to do with the running condition or not, but it wasn't like this before the change to pulse-per-cylinder.

The SMC manual doesn't appear to cover these #s and what they mean.

I have the .cal file and pictures of trigger arrangement if needed.

Thanks,
Kevin

[MRMRacing]

Pictures of trigger and cal file would help.

[Kelly2264]

Here you go...

If you look closely at the crank pulley you will see the two "teeth" at 60 BTDC and 60 BBDC.

[MRMRacing]

You should remove the high speed mod to the SMC when going from 60-2 to pulse per cycle. You could also change to -Ve on cylinder pulse to get rid of the long pulses. Have you changed or moved the sync sensor or distributor?

[Kelly2264]

If I remember, I just had to add a resistor to the circuit board, no other modifications took place to perform the "high speed" mod, is this correct (it was quite a while ago)? I will remove the resistor tonight when I get home if this is right.

The crankspeed sensor is magnetic with a reluctor interface. Will this have any effect on changing to -Ve? By the way, the distributor pick up is a hall effect sensor.

I have not moved either the distributor or the sync sensor.

[MRMRacing]

Yes remove that resistor, let the +Ve be there if it is inductive. It looked at the pic like a gear tooth sensor which I had preferred with your installation. Inductive sensor are more sensitive for picking up noise, they are also sensitive for the sensor gap and tooth size. Could not just fit the gear tooth instead?

[Kelly2264]

By gear tooth sensor do you mean a Hall effect sensor?

[Kelly2264]

Do you think I should change my "cylinder reference" to -Ve? I was just reading through the software and thought that my distributor pick up is all metal with a window that is the reference mark. If I'm reading this correctly it should be going negative when it first "sees" the window...yes?

Sorry, also any word as to what the other numbers relate to? They are listed on the lower right hand side of the screen when you have the "monitor all" choosen in the software.

[MRMRacing]

Gear tooth is the hall effect sensor we often use with autronic, it only needs a tooth at 8*8 mm passing thru. Moving cyl ref edge is just moving the reference position from start of lug to end of lug. Do not bother about the numbers they are just hex codes for errors.

What sync/cyl values do you have? make sure they are between 20-80 % change edge on synk sensor if needed.