Ive got a 1978 302 in 67 mustang that has been idling high lately (about 1750 rpm) and when I turn off the engine it still fires once or twice before fully stopping. I was trying to adjust the carb to lower the idle today, thinking that this might have something to do with it since both problems started around the same time, but I couldnt seem to get the idle much lower. I went to turn off the engine since i couldnt figure it out, but this time it wouldnt quit running. It was running very rough of course since it had no spark and I unplugged the coil wire to be sure. It was running off of only compression I guess and was able to turn just fast enough to keep the mechanical fuel pump moving to feed itself. It eventually hissed and smoked from the carb and stopped running. I took the air cleaner off and saw some gas on the top of the carb around the air cleaner ring and I heard gas boiling inside. Im not sure if this is a carb issue or something deeper. What should I do here?
302 still running after turning off ignition
- Thread starter AlexM556
- Start date
Blackhawkxx
Stroke it!!!!!!!!!!!!
- Mar 3, 2023
- 578
- 575
- 103
First always check the simple/easy stuff first, disconnect the linkage at the carb to make sure that isn't hanging up. Do a visual check for any broken vacuum lines and with the engine off, look down into the carb to see if the throttle blades are fully closed. Is it a factory two barrel or aftermarket carb? Is the engine over heating?
Ive got an aftermarket carb (edelbrock 8867), engine temp is normal, no overheating. I didnt find any broken vacuum lines. If anything, the vacuum should be improved now that i have vacuum caps instead of the last owner's solution which was a short piece of hose with a bolt jammed into the end. All 4 blades appear to be fully closed and all linkage feels like it moves freely without binding.
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