Just A Guy
Join Date: Mar 2007
Location: New Jersey
My Ride: 1990 Daytona Shelby
Engine: 2.2 L VNT
Thanked 1 Time in 1 Post
Re: Tach Messed Up
I do not know what type of circuit board is used on an 83, however, the problems in the newer TD's is usually related to cracked solder joints on the PCB or a connection issue with the tach drive module to PCB or Tach to PCB.
The best I can tell from my wiring is the tach signal comes directly from the - coil to the cluster, what that voltage should be???
On the newer TD's the tach voltage is 2.4 AC volts but comes from the engine controller.
Maybe John can check his 83 FSM's to see if there are tach diagnostics in there.
1990 Daytona Shelby VNT
40 Years ASE Certified (Retired)