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Bronco won't stay alive


Nelson and Hudson

Well-Known Member
Joined
Jul 8, 2020
Messages
80
City
Redondo Beach
Vehicle Year
1987
Engine
2.9 V6
Transmission
Automatic
1987 Ford Bronco II 2.9L V6 Auto

replaced: Fuel filter, oil filter, new oil, alternator, starter relay to starter cable, ignition coil + connector, distributor and cap, wires, ignition switch, plugs gapped, new battery, cleaned the IAC, cleaned and inspected TPS, replaced throttle body gasket

Hello this is a new issue I'm trying to fix I start up the Bronco it'll run for 30 seconds decent idle and then randomly die.
I'm not sure what to do or where to go from here.
Any advice would be appreciated.
 
Could be-
-Plugged fuel filter
-Clogged air filter
-Vacuum line broken, missing or off
-vacuum advance weights corroded & stuck
-faulty sensor (map, maf, 0², ect)
-heck maybe your gas cap isn't on tight/vapor lock
 
-Plugged fuel filter : Replaced recently
-Clogged air filter : Blasted that out with air. Also wouldn't cause it to run for 30s then die abruptly
-Vacuum line broken, missing or off : Maybe? Again, I'm pretty sure everything is on and working
-vacuum advance weights corroded & stuck : Maybe? How would I check?
-faulty sensor (map, maf, 0², etc) : ^^^
-heck maybe your gas cap isn't on tight/vapor lock : Definitely not, broke a gas cap recently so ever since I've been extra careful to put it on properly
 
Screenshot_20230827-233822-655.png

Just get an appropriate gauge and fittings kit, and it goes along the fuel line somewhere in the engine bay. You'll have fairly accurate fuel pressure readings all the time. They're cheap
 
Could it be prone to leaks?
What kind of line is best?
Does it only need one line from the fitting to the gauge?
 
Could it be prone to leaks?
What kind of line is best?
Does it only need one line from the fitting to the gauge?
Just use whatever is recommended. Never use teflon tape for fuel systems because it melts
 
@BroncLander I just reset the base idle to where it should be at 700 rpm with the IAC unplugged. But as soon as I plug that IAC, my idle goes all over the place and it does in a few minutes. Does this mean my IAC is bad?
 
@BroncLander I just reset the base idle to where it should be at 700 rpm with the IAC unplugged. But as soon as I plug that IAC, my idle goes all over the place and it does in a few minutes. Does this mean my IAC is bad?
Afaik, unplugging the iac should bring idle down to 500 or even kill the engine. Sounds to me like you have a vacuum leak.
 
Afaik, unplugging the iac should bring idle down to 500 or even kill the engine. Sounds to me like you have a vacuum leak.
I'm not sure it's a vacuum leak. After I reset the ECM by taking off the cables for a while. After reconnecting the B2 will run for a good few minutes before intermittently dying. Seems to be out of the blue with no warning. Does this imply a vacuum leak? What other tests can I do to confirm whether or not it's an electrical issue. It idles great now, even with the IAC connected, but it will just abruptly die. Doesn't matter if it's warm or cold.
 

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