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  #1  
Old 08-23-2015, 04:07 PM
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Rock&Roll Firebird Rock&Roll Firebird is offline
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Default Engine starts, misses and stops... ?

Hello guys, another riddle. About two weeks ago I took my Bird out. On a highway the engine started to miss exactly in a way when a fuel would be running out. As my fuel gauge did not work at that time, I pulled the car over, added about 10 liters of gas started normaly and finished the remaining 10 kilometres of the trip. On a way back, after about 5 kilometres, the car started exactly the same bahaviour. After the engine startup it was missing a lot as if insuficient gas would be pushed into the carburetor. I called the AAA and the car was moved on a trailer into my garage.

So I figured the gas tank, filters and lines need to be checked, exchanged and cleaned. And thats exactly what I did this week. Unfortunately the problem presists. Just a note - the gas pedal does push a stream of gas into the caruretor and intake. I created a short video - not sure if it is of any help (and my mobile rotated it in a wrong way...). Anyway, if you could check it here:

https://youtu.be/EXm_H0td_N8

and let me know where to start digging (distributor or a coil maybe), I would be very gratefull.
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Old 08-23-2015, 04:29 PM
Joe Johnston Joe Johnston is offline
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4 things come to mind:

if you are using points and condenser, maybe the condenser is failing when warmed up. When this happens the engine will run OK cold but not hot. If using Petronix it may be failing.

Coil may be failing when it gets warmed up

Vacuum advance may not be working

Carb power valve not working (but I doubt it from your description)
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  #3  
Old 08-23-2015, 04:33 PM
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Just need to add, that the video and the engine behavior today was with a cold engine.
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Old 08-23-2015, 04:39 PM
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It does seem that it's being starved of gas. You could have some dirt in the carburetor. The accelerator pump in the carburetor may be bad. As mentioned I would check the vacuum advance also. I can't tell by the video whether your choke is working properly.

John
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Old 08-23-2015, 04:49 PM
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Quote:
Originally Posted by jopizz View Post
It does seem that it's being starved of gas. You could have some dirt in the carburetor. The accelerator pump in the carburetor may be bad. As mentioned I would check the vacuum advance also. I can't tell by the video whether your choke is working properly.

John
The accelator pump works properly I guess - as it sprays the gas into the intake when the gas is iniciated. The choke was closed on the cold engine and the very same behavior was when the engine was hot.
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Old 08-23-2015, 08:11 PM
Sherman Sherman is offline
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Hello, how about a faulty fuel pump or clogged filter that is in some of the older "glass style" fuel pumps?
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Old 08-24-2015, 01:38 PM
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Quote:
Originally Posted by Sherman View Post
Hello, how about a faulty fuel pump or clogged filter that is in some of the older "glass style" fuel pumps?
The fuel pressure from the tank should be OK as I have an. el. pump installed on the tank that seems to work fine. Also I installed a transparrent/plastic fuel filter near the carb to see the flow of the gas to the carb and everything looks fine there.
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Old 08-24-2015, 03:53 PM
1946hamm 1946hamm is offline
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If you just installed the electric fuel pump, check the fuel pressure. If it is more than 6 or 7 psi that is too high and will flood the carb and load up the engine or foul the plugs. Most of the mechanical fuel pumps only provided 3-5 psi fuel pressure.
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Old 08-26-2015, 04:51 PM
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So, the story continues. Today before I cranked the engine I removed the carburetor cover to check the fuel level in the body. Both chambers seemed filled with fuel at appropriate level so I guess there should be no problem in feeding the carburetor with gas.

Also I wanted to check the choke and it's role in the present situation. I covered the carb and cranked the engine. The engine was idling for about 4 minutes and got into working temperature. During that time the 'missing' symptome was still there. The only way to keep the engine from stopping was to gently keep the choke from standard and full opening. When I released the choke to open after about 4 minutes of engine idling, the engine stopped. This first part is recorded in the first video here:

https://youtu.be/CvSan8LWtw8


Wasn't exactly sure what that supposed to mean but decided to crank the warm engine again and give it a bit of load. That's exatly what I did - pushed the acceletator hard for several times. And suddenly, everything started to work just fine - no more 'missing' and the engine ran smoothly with the choke fully openned. I let I run for about 5 minutes then stopped the engine, cranked again and let it run again without any problem. Recorded this state into video here:

https://youtu.be/D4pFbU8LE3E

What I think about this situation, it seems that the problem is neither electrical related nor vacuum advance related. Seems to me like something that was restricting the fuel flow in the carb was released with the sudden 'load'. The question is - is it gone from the carb? And if not - how to check that. I will be testing the engine on the yard for now before I take the Bird to the streets.

Any of your opinions or suggestions what else should be checked are welcome.

Last edited by Rock&Roll Firebird : 08-26-2015 at 05:11 PM.
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Old 08-26-2015, 06:06 PM
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I would like to say your problems are over but from experience whatever caused it to run rough will most likely come back. It's one of the reasons I ditched the Ford carburetor and went with an Edelbrock. Even with a new tank, new lines, new fuel pump, new filter and rebuilt carburetor I still couldn't get mine to run smooth for more than a couple days. Then I would have to take it apart and clean it out even though it looked perfectly clean. If I took the idle mixture screws out and shot carburetor cleaner into the holes it would run fine for a couple of days and then it would start running rough again. I chalked it up to something in the modern fuels and left it at that.

John
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