Crank Trigger Sensor

[bobbyearl]

I have a new MS3 installation on a 88 Jeep Wrangler with straight 6 converted to MPI.

* Trigger wheel is a 7.25" / 60-2.

* Coil is IGN-6 Six Tower Coli Pack

* Sensor is 1/2" Magnetic Crank Sensor from Electromotive

I've had the engine running, but with starter kick-backs and backfires. I don't think I'm getting a good/consistent signal from my crank trigger. What's the best way to test for that? What voltage should I see when I'm testing?

Thank you in advance for help!

Regards

[Matt Cramer]

To test the crank trigger, try capturing a tooth log. This link shows how it's done.

http://www.msextra.com/doc/pdf/html/ms3 ... 1-303.html

[bobbyearl]

I got some of the issues sorted out by installing the 2 10k resistors, the tooth log appears to be correct now. Now with the engine running, it's running rough with frequent back firing. Looking at the log I'm still getting a lost sync reason 02 and consistent SecL count increasing. Is the sync loss causing the back firing?

thx

[Matt Cramer]

It remembers the last reason it lost sync, but Lost Sync Count is not counting up so it is not losing sync in that log. Check your timing with a timing light.

SecL is just the internal timer.

[billr]

And, check spark timing on every coil.