kevmac

iTrader: (1)

I have no tack signal out of my 67 lsx. No voltage at all. Is this a program or ecu??
thanx

flame

iTrader: (13)

http://www.lt1swap.com/lsx_tach.htm

kevmac

iTrader: (1)

thanx flame, tried that alreay. if the is 0 voltage at the tach signal, how can any step up help?

badazz81z28

iTrader: (6)

What engine ECM are you running? The newer engines like LS3 don't have a signal for a Tach. Autometer sells a box specifically for this problem.

kevmac

iTrader: (1)

Its an 02 ecm, tried the pull up and got nothing. may try the trigger wire on one coil pack

badazz81z28

iTrader: (6)

Something isn't right with yours, I have a 2002 411 PCM as well. I do have a signal despite it being off. You should have a signal.

wait4me

iTrader: (10)

Verify that you are using the right pin for your tach coming from the pcm. Pin 10 is the number and it is usually a white wire.

If it is, there really isn't any way for it to be shut off, so it should always work. The main issue with the outputs is that they are just tuned for the wrong pulse, so the tach will be wrong unless the tuner sets it up for an exact customers needs. For example, at 400rpm, the tach will show 800. It is an easy fix though..

One thing also on this issue, the tuner has the ability to turn on a Tach pull up, which sometimes helps.

kevmac

iTrader: (1)

When its running, I get 0 Va/c. I bump the accel pedal and rev it a few and nothing. It is the white wire from the 10 pin.