MSefi.com read only forum (Jan.15,2018)

My signal only drops out until the engine reaches normal temp and it is in warmup after that it works fine. On restart the problem only last a few seconds.

I do not have acess to a oscilloscope. Tryed moving sensor in to .010 this did not help.

Installed a different sensor. No change, found that signal still drops at 1200 rpm when I restart the engine at normal operating temperature for about 30 seconds.

Have adjusted from .020-.120 with no change if I go over .120 it looses signal. Currently set at .040.

When I wire it the other way it has no signal at all.

I tried adjusting the pots this did not help. If I go to far,it Iooses the signal during crank. When the RPM comes up fast enough the signal comes back at about 2500 RPM. Do you have any ideas?

I am using a 3.57 board with the sensor wired directly to the tach input.

I am using 36-1 DIY wheel with a ford vr sensor

I have good tach signal at idle but drops out at 1200 rpm until engine reaches normal operating temperature. After warm-up, tach signal is fine at all rpm's up to 6500. What could cause this?