OK Guys, Here's a tough one. 1995 Ford F-250, Engine
code H, 5.8 liter, GVW - >8600.
Problem: MIsfire under light acceleration and above. Drops injector pulse on one bank ( #'s 2,3,6,7)(white wire to ECU). Idles perfectly. All injectors working.
Parts replaced: Complete secondary ignition (cap, rotor, wires, plugs and coil), Distributor (twice), Remote mounted TFI (twice), ECU (twice).
Diagnostics Done: Checked and verified all signals present to TFI and ECU. Using a MODIS to perform tests. Cut the white wire to check for Injector pulse at ECU. Pulse goes away under light throttle. (Light throttle applied while in drive with park brake
set.) Looking at data on MODIS, Bank 1 injector pulse looks normal, Bank 2 injector pulse is zero at idle and engine running perfectly.
Has anyone seen this? Could an injector with very low resistance be causing the ECU to burn out on that bank? As in too many amps getting to the ECU?
Brian Harbour, Brian's Auto Repair, A.S.E. Master Certified