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  #1 (permalink)  
Old 06-04-2019, 04:58 PM
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Cobra Make, Engine: SPF 2773 Ford Racing 427W
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SPF Help! I'm Jerry , I have # 2773 , have owned since day one 2008, did the install myself. Ford Racing Windsor Stroker 427, Dual Spark Blue , MSD 8485, standard coil, Holley 670. It started running bad last fall, rebuilt carb. replaced trigger coil, still ran bad. Missing in exhaust note. Took carb apart did not see anything wrong. Still runs rough, replaced coil, no change. Now when the twin fans come on it kills the motor. Now after it starts it runs for 2 seconds then shuts off. Ran a 12V wire to coil , after it starts it will keep running, but when the funs come on it stumbles . Replaced ing. switch, did not change. I'm stumped, Jerry
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Old 06-04-2019, 08:14 PM
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What is the spark quality like at the plug leads, as tested with a spark tester etc?

Have you visually checked the cap and rotor?

Gary
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Old 06-04-2019, 09:11 PM
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if you disconnect the fans does it run right?
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Old 06-04-2019, 09:52 PM
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What does your ammeter read while the engine is running with the fans off?
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Old 06-04-2019, 11:19 PM
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Cap and rotor are new . Amp meter reeds to the plus side . I have a spark checker on number 8 plug wire, I can see it's misfiring.Optima battery was
check ,amps and volts are good. Ground wire were cleaned. Thanks guys for chiming in. Jerry
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Old 06-04-2019, 11:22 PM
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I'll try unplugging the fans tomorrow . Jerry
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  #7 (permalink)  
Old 06-05-2019, 06:46 AM
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Bad ignition box?
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  #8 (permalink)  
Old 06-05-2019, 07:32 AM
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Ignition box was replaced , did not change the problem.
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Old 06-05-2019, 08:00 AM
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Quote:
Originally Posted by FOMOCONUT View Post
I'll try unplugging the fans tomorrow . Jerry
When the fans come on, that places additional load on the alternator which needs mechanical energy from your engine -- and that is just enough to kill your engine (because the engine is not running right). If you disconnected your alternator, and the fans were on, it likely would not kill your engine. You could test it that way to eliminate the red herring of some sort of bizarre wiring malfunction that involved the fans that was causing your engine to run poorly.
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Old 06-05-2019, 08:11 AM
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check relays and make sure battery is fully charged.
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  #11 (permalink)  
Old 06-05-2019, 08:21 AM
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Did you replace the plugs?
Is it one cylinder misfiring or all of them?
Pull plug wires one by one while running and isolate misfiring cylinder. Swap plug to another cylinder and see if misfire moves to that cylinder. If so, itís the plug.
If not the plugs, wires, distributor, coil, carb, alternator, pull the offending cylinderís valve cover and rotate engine manually to check valve operation. Could be a valve failing to open.
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Old 06-05-2019, 09:08 AM
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Do you have a choke horn on that carb? If not its easy to get the main body backwards...
SURE the plugs are per firing order?
Polarity to the coil correct?
Have you opened up your MSD(?) Dizzy? Does it look like spent time at the bottom of the sea? (They Rust BAD)
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  #13 (permalink)  
Old 06-14-2019, 08:45 AM
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Jerry you might want to post this in the SPF area, rather than the NW Club.
Superformance - Club Cobra

Good luck
Tim
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