Before I had my Ron Francis debacle and blew a slew of TFI modules when I put all diode suppressed relays in the EEC and FuelPump also diode Suppressed starter solenoid in my F250 I put an Accel TFI Module at 300k when I did the T-chain and waterpump and it stayed there for 16yrs and I even deleted the factory clutchfan and put an electric fan....
This module worked like a champ for 16yrs until I hooked it up to RF's TDZ-75 harness and it became history in 5 on and offs of the keyswitch................
Everyone thinks the TFI modules fail from heat...They dont...They fail from being shocked to death by Flyback...........I had my burnt out TFI modules tested and they showed Zero signs of heat fatigue and Infinite signs that point to the unit being fed too much high current and Flyback emits over 400volts back into the electrical system when the solenoid or relays electromechnical field collapses...........
Diodes are what fixes flyback which protect the system from being stungunned to death.............
In 1995 Ford Recognized Flyback and started putting Diode protected relays in their EEC and FuelPump relays but failed to put one on the starter solenoid which wasnt as severe as having all 3 unprotected...Some will argue they used a different processor chip and that reduced the heat but like I said the TFI modules I had tested showed Zero signs of heat fatigue which would cause the plastic case to warp and melt....
After putting diode protected relays in the relay block and a diode protected starter solenoid Ive had Zero issues with my TDZ Harness to date but then again I also suppressed alot of r/f interferrence that is emitted throughout the whole harness and the noise causes the sensor readings to fritz out....
I fixed that issue with Ferrite Choke beads in different sizes....I put 4 choke beads per each fuel injector wire wrapped then in copper foil tape then wrapped them in harness wrap and I put one ferrite choke bead at each power feed wire for each relay and one on the main power wire aswell as the negative to the head....
On my upgraded 170 amp alternator I put a 200 amp NewMar Noise remover between the alternator and the battery and now when I do a data log the noise and lil anamoly spikes are so minimized they are rarely found anymore whereas they turned up quite often prior....
I also put them on the TFI module wire harness, The TPS wires , The coolant temp sensor wires and the IAC too................
I got the Ferrite Choke beads from Amazon...60 pcs of assorted sizes for $20.00..Theyre designed to absorb the noise...As a tradeoff they generate a lil heat but its negligeable...
Im glad to hear you got it fired up.....Thats the first step.....Ironing out the gremlins is next........Take care SC