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Running Problem
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http://www.clubcobra.com/forums/all-cobra-talk/121753-running-problem.html)
| CONMAN |
08-10-2013 12:30 PM |
Running Problem
Started my car today and it ran for about 10 seconds and just shut down. I tried another dozen times with same result. Problem is I'm a little mechanical but not sure where to start looking. Need some suggestions if anyone might know what could be causing this. Thanks
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| Tom Kirkham |
08-10-2013 12:56 PM |
Check the fuel pump, and fuel filter.
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| CONMAN |
08-10-2013 12:59 PM |
Thanks Tom. I changed the filter thinking that was it but will try pump as well.
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| Tom Kirkham |
08-10-2013 01:06 PM |
A fuel pressure gauge can be a wonderful thing to have...
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| CONMAN |
08-10-2013 01:21 PM |
Tom, I do have a pressure gauge and I checked my fuel filter which is glass and it shows that it is full of gas. ?
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| Tom Kirkham |
08-10-2013 02:28 PM |
And what does the fuel pressure read when running?
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| Gaz64 |
08-10-2013 02:28 PM |
Instantaneous shutdown is spark, gradual shutdown is fuel, which way does it shutdown?
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| CONMAN |
08-10-2013 06:46 PM |
Fuel pressure reading is 6 psi. The shut down is instantaneous.
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| Tommy |
08-10-2013 06:59 PM |
My troubleshooting process is this: - Remove air cleaner, look down carburetor, fully open throttle and see if fuel squirts. If so, the problem is not fuel. If not, carburetor is not getting fuel.
- Remove the distributor cap and watch rotor while the motor is turned over with the starter. If the rotor does not turn, the problem is with the cam/distributor shaft.
- If you are getting fuel and the distributor rotor is turning, the problem is likely lack of spark due to a problem with the iginition system/wiring.
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| RET_COP |
08-10-2013 07:31 PM |
Does it start right up after every shutdown or do you have to wait?
Does it cut right out or does it burble to a stop?
Is it a mechanical or electric fuel pump?
Are you feathering the pedal during this time and is it revving or are you just letting it idle when it dies?
A full fuel bowl will last more than 10 sec. unless your floats are set very low.
Do you have sight glass for your bowl levels?
Can you see fuel when you rock the car?
How has the car been prior to this?
Is this a new problem or have you been having smaller issues prior to this?
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| Texasdoc |
08-10-2013 08:55 PM |
Check the coil.
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| CONMAN |
08-11-2013 06:04 AM |
It does start right up after shut down. I have tried letting it idle and I have feathered the pedal before it shuts down. It is a mechanical fuel pump. I do have a glass fuel filter and there is full of gas. This is a new problem. It ran great prior to this. I'm thinking more along the line of a coil problem as Texasdoc mentioned but wanted some input from some of you before just replacing everything.
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| RET_COP |
08-11-2013 07:20 AM |
I think the Doc could be right also, I just wanted to go through progression to eliminate fuel. Thats easier than electrical, for me anyway. Electronics arrrrrgghh!!!
I meant the sight glass on the fuel bowls. If you don't have them then you'll have to take the little screws out of the side of each bowl and rock the car a little, fuel should dribble out. Sight glass the fuel should be no more than half way.
If a needle is stuck it will allow the bowl to overflow and kill the engine....in 10 seconds, once the fuel evaporates a little you can start it up again and the process continues.
Eliminate the easiest first :)
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| CONMAN |
08-11-2013 09:43 AM |
Thanks. I'll try that first
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| Texasdoc |
08-11-2013 03:20 PM |
The glass fuel filter being fill doesn't mean the carb still has fuel. There is now way for air to get back into the line. You can check the bowls for fuel thru the windows as noted, but my guess is coil.
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| Danr55 |
08-15-2013 07:55 AM |
Have you spent any time looking at the ignition system? Are you running a traditional ignition or a more modern ignition? If you have ballast or condenser or voltage regulator that has gone south it may work until it heats up then shut down.
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| Michael C Henry |
08-17-2013 06:45 PM |
Did you ever figure it out? I would have asked if you had pulled the distributer cap to se if the rotor was moving when the engine cranked? I had similar and the roll pin in the distributer drive gear sheared. Mine was the original 1/8" spring pin that sheared due to the load of hyvolume oil pump additional spring pressue on releif and cold oil. I installed a true roll pin I got from MSD trough Summit Racing Parts( I have a Mallory System)
If you whish I could disscuse it further.
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| CONMAN |
08-18-2013 10:32 AM |
My rotor is turning when the engine is cranked. Right now I'm waiting on delivery of a new coil to try and see if that is the problem. I will keep everyone updated after I get it installed.
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| CONMAN |
08-21-2013 04:08 PM |
Well I put the new coil on and that didn't work. ??????
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| Danr55 |
08-22-2013 05:02 PM |
OK, so what type of ignition system are you using? Do you have the traditional system?
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