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Nervous incident with lucinda

2698 Views 34 Replies 15 Participants Last post by  HarryZ
So yesterday i rebuilt my carb. It is a motorcraft 2100 so very easy to rebuild. However today i tried starting up the car. I tried starting the car before i rebuilt the carb but she wouldnt turn over. Today she turned over and the first time it sounded like the engine whined and then died out. I assumed because it just needed to get gas back in the carburetor. So we tried again and i saw the fuel filter fill up and then it turned over again and died immediately. I tried starting it for the third time and it turned over but right when that happened the carburetor blew a huge fireball to the ceiling of the garage. I dont really want to start it again or even know if it is safe to try again. Halp lol
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Ignition timing is messed up and /or float set incorrectly dumping fuel in. If you pulled off your ignition wires, did you put them back on the cap in the correct firing order and in the correct direction? What made you rebuild the carb to begin with?
I didnt pull any ignition wires. And the float from what i measured was the same before i took it out. I rebuilt the carburetor because i dont think it has ever been taken off nor taken care of and it has always given me problems since the get go.
So for some small back story this car has been sitting for about three years just recently got it shipped to me. I used it as a daily driver but them it sat in a back alley in grass and now i have no idea what needs to be done. When i rebuilt the carburetor last night i put everything back the way it was but no dice. I didnt unplug anything from the distributor nor did i even turn it in the slightest. Also i apologize but im not too educated on the car. I know some but not alot of it. So dumbing things down a little might be best. My main concern is the fireball as well. Is it even safe to give it another go? I mean ill try it as many times as needed with as many fireballs i would just rather not have my carb explode completely.
1st, put your city/state in your signature. Maybe someone close can stop by to help. So it was running ok when you parked it 3 years ago. Also curious if its points or electronic ignition. Have to ask if you popped the cap to take a look see and if its points can you clean the contacts and check the gap. If you pull the coil wire and crank it over does it seem to be dumping raw gas into the intake? I have 3 extinguishers in my garage and one in the car!
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I hate it when that happens. As long as you don't have your face near the carb it's not dangerous. Startling, though.
? Sure gets your attention.

How long has it been since the car ran? Did you start it before you took the carb off for the rebuild? How old is the gas in the gas tank?

Could be a million things... we need more info to help.
The lst time the car ran was three years ago. When it was shipped here i tried starting it and it would crank and crank but wouldnt turn over. Ive always meant to rebuild the carburetor but didnt get around to it til two days ago. But 3 years ago yes it was running fine but i believe it was running very rich and i couldnt quite tune the carb correctly. Also never did anything with the plugs nor the discriminator. Ive researched all last night for other people with the same problem and ive been seeing almost all have to do with the timing and the discriminator. Possibly someone back home couldve messed with mine but how do i fix the timing when i cant start the car?
About the throttle cable its been like that since i got the car and its never been a problem same with the coil. I used to daily drive it. And the vacuum hoses i have no idea what they are supposed to go or do or what honestly
What's up with the big 1980s vacuum diaphragm thing in the back of the intake manifold?
That's an EGR valve, I don't see how it could be part of the issue and it's disconnected anyway. You're right about it (the intake) being off a later model engine though.

My vote is ignition/timing. Even though it supposedly wasn't touched I believe it's off. 90% of my brief fireballs were ignition related anyway. The others were from fuel flooding type problems and had to be put out.
Okay thank you all i will try and reset the timing or try to fix it. And then i will keep yall updated on anymore fireballs. Also like i said before im not the best person for the job so is there someone that can tell me a fail proof way of setting the timing while the engine is off or at least get it close enough to start my car?
By the way will be posting pics soon when the hood is back on and the brake lines are complete
Okay. The throttle cable has already been mentioned so....

Not mentioned. Vacuum hose that appears to be running from the carburetor air horn rear to the vacuum tree at the back of the intake. Remove this hose and plug the port on the vacuum tree. With it connected the way you have it you are just creating a vacuum leak. That port on the carburetor air horn is used with a hot air choke to provide filtered air to the choke thermostat. Since you're running an electric choke you don't need it.

While we're on the subject of the electric choke... where is it connected? If you have it hooked to the coil circuit, either at the coil+ or the starter solenoid "I" wire, move it to the alternator stator post. It doesn't look like the choke ever closes, either. Does it? If you have an ohmmeter, also check the choke thermostat housing's continuity to ground so if current IS going to the choke it has a ground path.

Did you use a new base gasket? Did you disturb the gasket BELOW the EGR spacer?

Hint: you can "pre-fill" the float bowl through the vent(s) prior to starting so you won't be cranking and cranking and cranking trying to fill the float bowl.
So the vacuum tree on the back of the intake has two ports shall i just plug them both? And since im removing the hose do i just completely get rid of that hose then? The choke im pretty sure is connected to the starter solenoid. Tomorrow i will move it to the alternator stator post. Also yes the choke does close but seems to open fairly quickly i think i just need to adjust that. I do not have an ohmmeter but im sure i can get one from someone. Yes all gaskets involving the carburetor are new. By “prefill” you mean pouring gas into the carb? The few times i tried starting it there should be plenty of fuel in the bowl. Thank you by the way everybody for helping me with this i truly appreciate it. Ima 22 year old just spending money and trying to get his mustang to work so this all helps.
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I recently watched a guy trying to start up his Boss 302 and he was throwing flames out his carburetor. The car ran fine when he got it to the show, and nothing changed. After a few tries, he ended up pulling his distributor cap and found the inside contacts pretty gunked up. He pulled out a pocket knife and scraped all the contacts clean as he could get them. Put distributor cap back on, and the engine fired right up. He said it wasn't as smooth as he liked, but he left the show with no issues. Just another suggestion to check.
With trying to get my timing reset or corrected ill definitely be cleaning the contacts under the cap. I cant even remember the last time i saw the inside of the distributor.
Harbor Freight has their cheap volt-ohm meter for $6 or free if you find the right coupon in the mail or a magazine.
https://www.harborfreight.com/7-function-digital-multimeter-63759.html

They might not be the world's greatest meters, but I have a couple and they'll definitely work for what you need here, and it's really hard to beat free.

If you can't find the ad for a free one you can always use the 20% off coupon too.
https://www.harborfreight.com/digitalsavings.html
Well hell yea thanks for that i actually need more tools so that coupon will be coming in handy thank you.
So the vacuum tree on the back of the intake has two ports shall i just plug them both? And since im removing the hose do i just completely get rid of that hose then? The choke im pretty sure is connected to the starter solenoid. Tomorrow i will move it to the alternator stator post. Also yes the choke does close but seems to open fairly quickly i think i just need to adjust that. I do not have an ohmmeter but im sure i can get one from someone. Yes all gaskets involving the carburetor are new. By “prefill” you mean pouring gas into the carb? The few times i tried starting it there should be plenty of fuel in the bowl. Thank you by the way everybody for helping me with this i truly appreciate it. Ima 22 year old just spending money and trying to get his mustang to work so this all helps.
Yes, eliminate the hose and cap the ports you don't use. If you don't have power brakes, automatic transmission or a/c you don't need anything connected to the vacuum tree. Yes, filling the carb with gas. It takes quite a while as anyone of us old farts who have ever run out of gas on the highway can tell you....
Okay so ill fill it with gas then and try it out after work let you guys know how everything goes. Also i have an automatic transmission sadly should i still plug all ports on the tree?
How do i get the number one cylinder to TDC to fix the timing. I feel like im terrible at comprehending how to set the distributor while the car is off
Also with my stupidity i took off all the spark plug wires and i dont know which one goes where help!! Lol
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