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78 bronco 6.6 400 wonít always start

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78 bronco 6.6 400 wonít always start

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  #1  
Old 07-04-2018, 02:12 AM
Dman275
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78 bronco 6.6 400 wonít always start

alright. Recently got a 78 Ford Bronco. 400
Whats going on. Sometimes it just wonít start. Sometimes Iíll try it, nothing. Leave it alone come back the next day fires right up. Or Iíll drive around all day no problems then go to leave and nothing. Looks like the previous owner was haveing the issue too. It has a new ignition relay. Battery. Voltage regulator. Starter. Ignition coil And ignition control module. Iíve looked through most wires. Donít see anything loose. Idk what to try next. So what happens when itís not starting. I turn the key and hear a kind of boing. I believe the ignition coil. And the brake light comes on. And thatís it. Put in the last part today. Fired right up. Drive around a bit. Went to the store and first turn nothing. Second then. It slowly fired up.
 
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Old 07-04-2018, 07:17 AM
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I'm going to guess the neutral safety switch circuit. I had the same problem and found that someone had bodged bypassing the switch when they swapped out the auto for a manual trans.
 
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Old 07-04-2018, 12:46 PM
Dman275
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Idk cuz Iíve tried starting it from neutral not just park. And nothing. And if it where the switch the starter solenoid wouldnít open right?
 
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Old 07-04-2018, 05:11 PM
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You should go investigate it.
If you ask for ideas, don't be so ready to dismiss them unless with out a doubt you have ruled it out
 
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Old 07-04-2018, 06:00 PM
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Iím still a bit confused on what youíre hearing when you turn the key to Run but it doesnít start. If you hear the starter solenoid thump then your ignition and NSS circuits should be good. If itís not cranking youíve got an issue from the solenoid to the starter. If itís cranking but not firing then it could be air, fuel, or spark.
Have you replaced the ignition switch on the column?
 
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Old 07-10-2018, 07:53 PM
Redark1
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Dont forget the pickup coil in the distributor.
when you said it started slowly explain that more please.
 
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Old 07-11-2018, 10:30 PM
e.lair
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I had the same problem with my 5.8. I changed out the fuel pressure regulator and havenít had a problem since.
 
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Old 07-11-2018, 11:11 PM
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A 78 in stock configuration doesn't have an FP regulator
 
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Old 07-15-2018, 07:38 PM
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So some times cranks right up, sometimes just the starter solenoid clicks (boing), and some time starts turning slowly?

I would suspect;

1 Starer Solenoid (rare to be bad if new but does happen)
2 Cable from solenoid to starter
3 Bad Starter Ground or engine to chassis grounds (check them all)
4 Bad starter. 1 or 2 bad windings will cause no rotation when you try to start then it’ll catch and drag or fire right up. Mine’s doing this now but it has to wait for my shoulder to finish healing for me to replace it
 
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