My 1988 ford bronco will not start without starting fluid after it has sat overnight. Once I spray it with starting fluid it will run fine the rest of the day. The other problem is its blowing alot of carbon out the exhaust. Temperature extremes don't have any effect on it's starting . Is this a fuel injection problem?
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Re: will not start without starting fluid
Try Running a Couple of Cans of B12 Chemtool through a Full tank of Gas one Can at a Time. I use this in ALL my Vehicles at every other Fill up and it keeps the Valves and Fuel System Clean all Year long. You can get this at your Auto Parts Store or Wal-Mart in Automotive. It will Clean up the Valves and Plugs and should Eat away that Carbon Build up. Could even Help with the Starting Problem also. Please Rate My Response! Thanks!
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Being that this vehicle is a 1988 it is most likely still using an electric choke. When your vehicle is cold (even just not warm enough) it needs a richer fuel/air mixture to start which is what the choke is there for. When you turn the key the choke will automatically shut so the suction from the engine will pull fuel from all circuits of the carb. Anyways.. long story short for some reason it would seem your choke isnt closing as it should. This is generally just a hot wire thats connected to your carb.... maybe a short maybe its stuck open for some reason.. idk but that is where you should focus your attention. Hope this helps.
The Bronco has TWO fuel pumps, a low pressure and a high pressure. Low pressure is located in the fuel tank, the high pressure is located....Attached to the LH frame rail ahead of the fuel reservoir. my guest would be the high pressure pump is getting hot and shutting off, cooled down and starts back up again ??
It sounds like you aren't getting fuel out of the cold start injector... remove the injector when engine is cold and switch on ignition... you should get a fine spray pattern for a few seconds... if not then there is probably a problem with the cold start circuit (Temp sensor fault), or the injector is faulty. pull electrical connectors one at a time and look for corrosion... Hope this helps...;-)
if the fuel pump cutoff was tripped it would not start at all, I know this for sure, I am a Ford dealer tech and I specialize in no starts and check eng lights. If the ignition switch is bad the 2 halves of the switch will be starting to come apart, it is very common, u should be able to either see it or feel it with your hand.
You should try checking the fuel pressure to see if it too low. If the pump sat for a long time like that and then was turned on for awhile it may have bought the farm. It may still be pumping, but just not enough. Try givng it a compression check as well just to see if it has any problems there.