97 FORD RANGER WILL CRANK BUT WILL NOT START?
PLACED NEW MOTOR IN AFTER OLD MOTOR BROKE A TIMING BELT. HAVE BASICALLY REPLACE EVERYTHING, COMPUTER CAM SHAFT SENSOR COILS FUEL INJECTORS. CRAZY THING ABOUT IT, IT WILL START WITH A 6CYL COMPUTER IN IT TILL THE FUEL RUNS OUT OF THE LINE BUT REPLACE IT WITH THE CORRECT ONE AND NOTHING BUT BACKFIRING IF YOU EVEN GET THAT. REPLACED WIRING HARNESS ALSO. ANY Help WOULD BE APPRECIATED.
We'll have to assume you are talking about having installed a replacement 4 cyl. Engine but its not clear. If so, on many vehicles today when an engine is replaced the ECU must be re-programmed to run properly. That may be your problem but can't be sure.
If swapping a different ECU fixes the problem, then I suspect a bad ECU
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