electrical or fuel puzzle 428 super cobra jet
#1
electrical or fuel puzzle 428 super cobra jet
Selling a 69 mach 1 428 super cobra jet. Drove the car this summer (drove fine)(9 yr old restoration) put it in storage (with stabile in gas) in Oct, took it out(yesterday, Feb 17) and drove and within in 6 miles it was skipping, stalling, wouldn't idle and when I went to turn key off the car kept running. History of car, I am selling it for a friend that has passed away and had the buyer here. Felt bad for him, but the car has always performed well, this was totally unexpected.
I am not a mechanic. Any help would be appreciated.
I am not a mechanic. Any help would be appreciated.
#2
Too easy. The 428 was equipped with a Holley carburetor. Five months of drying out have trashed the carb, so the metering body gaskets have shrunk and are cross-flowing between circuits. A quick rebuild of the carb should do the trick. No adjusting will be needed, just get the new gaskets in and it'll perk right up.
Last edited by 2+2GT; 02-19-2012 at 08:46 AM.
#3
Thanks, I didn't restore the car, pulled the air cleaner and the carb is an edelbrock,
also why would the car keep running after I turned the key off. The car has been stored every winter since restoration and never an issue (always put stabile in the tank also).
It has an automatic choke which also works fine. I don't know if there is petronix ignition or he used points, Again, any suggestions greatly appreciated.
also why would the car keep running after I turned the key off. The car has been stored every winter since restoration and never an issue (always put stabile in the tank also).
It has an automatic choke which also works fine. I don't know if there is petronix ignition or he used points, Again, any suggestions greatly appreciated.
#4
electrical/gas problem 428 cobra jet
Too easy. The 428 was equipped with a Holley carburetor. Five months of drying out have trashed the carb, so the metering body gaskets have shrunk and are cross-flowing between circuits. A quick rebuild of the carb should do the trick. No adjusting will be needed, just get the new gaskets in and it'll perk right up.
Don't know if the car has points or petronix ignition any other suggestions would be greatly appreciated.
Coach
#6
#7
I know you said you put stabilizer in it but I would try some fresh gas...Last year my 68 would not fire up after sitting over the winter...After trying everything I could think of I finally gave it a splash of fresh gas and it fired right up...With the old gas it would not spit or sputter or even back fire..It was like the gas had turned to water.
#8
Bad ignition points would make it run poorly but it wouldn't explain why it would keep on running with the key off.
#9
electric/fuel 428 cobra jet
I am wondering if it's actually just running on(dieseling) because of poor fuel after sitting...Did the engine actually idle smoothly with the key off or was it knocking and thrashing around in the engine bay?
Bad ignition points would make it run poorly but it wouldn't explain why it would keep on running with the key off.
Bad ignition points would make it run poorly but it wouldn't explain why it would keep on running with the key off.
Good point, I put some better gas in and some dry gas incase there was moisture but did not improve it. The idle after the key was off was fairly smooth, don't think it was dieseling.
Am going to check the distributor and coil and solenoid, Again, thanks for your imput
#10
When you turn off the key and it keeps running, how do you stop it? Also having a EB carb gives a hint that the engine may have a lot of compression, this could explain the diesel effect. I would suggest some high octane fuel if this continues, the tank will need draining.
Last edited by 67 evil eleanor; 02-20-2012 at 07:20 PM. Reason: more info