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Ford 390 V8 shuts off when shifting gears(3spd), idles ok,can someone explain this? or what to check
June 8, 2014
with hood open have somebody watch engine for lifting on left side ,when letting clutch out if it raises ,replace left motor mount .check wire connections to make sure they are not strained to point of disconnect when engine moves under load . also gas line for pinching shut .
June 9, 2014
econimizer in carb or idle solonoid or low fuel pressure
sources: 35 years working on fords starting before the 390 motor
June 14, 2014
I have a 68 Mustang with a 289 automatic that is having a simular problem.Idles great but put in gear it dies.
I discovered it had a bad vacuum advance on the distributor...pulled the hose from carb and was able to blow freely into distributor so in gear it was pulling far to great a vacuum leak to run properly.
Hooked it back to the carb,took it loose from vacuum advance and plugged it and car worked fine...idle and in gear.
Maybe you have something simular.....maybe?
Hope this helps
June 24, 2014
If you have a factory or your own installed neutral safety switch the contacts inside may be wearing badly or unit is moving once in motion causing the engine to receive the shut down signal. these are not only installed on automatic transmissions. Just some food for thought chased a problem similar once before. Good luck
November 28, 2014
With the engine running tap on starter solenoid and see if the engine quits. If not check primary wires at coil.
July 29, 2015
You might also check the bonding strap from body to the engine. If the strap is missing you you might be losing a connection from the battery when the clutch is depressed. The battery is grounded to the engine and the engine is mounted in rubber. So the body is connected to engine through the bonding strap.
July 29, 2015