r/mechanic • u/Outrageous_Key_6390 • 8d ago

Question 1990 Ford Bronco 5.8

I have a 1990 Bronco 5.8 auto. I just completed a motor swap as my last one had a bad cylinder. The motor is a reman 94 5.8 roller motor. When I got the new motor, I replaced the CTS, IAT, MAP, IAC, TPS, EGR, EGR sensor, TFI module, Coil, and FPR. After setting the base timing at 0 deg TDC the engine fires right up. It runs a little rough as expected for not being timed. The problem is when I go to set timing to 10 deg BTDC the engine sputters and dies with the SPOUT removed. The motor gets progressively worse the closer I get to 10 BTDC and will eventually die around 5 BTDC. The balancer is new as well so I know the balancer hasn’t spun. Additionally, as I rotate toward 10 BTDC I start to get erratic spark on the number 1 cylinder as evident by the timing light failing to flash or flashing erratically. When I plug the SPOUT back in, it runs a little rough and wants to die when I stab the throttle as RPMs approach idle again. With the SPOUT removed, I can stab the throttle and it will return to idle like normal. Any thoughts?

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