back fire
Thread Starter
Heel & Toe
Joined: Dec 2013
Posts: 21
Likes: 0
back fire
Hell-o every body. I have a 1968 Corvette with the 350 hp 327. This an all stock motor,including the points distributor. When I bought the car it a Holly carb,not a holly on the street fan,but my plan was to replace it with a Quadrajet anyway. I gave her a good tune up and replaced the coil with an Accel coil.When the car is up to temp.and I put my foot in it,it would back fire through the carb,I blamed the Holly and replaced it with original quad. The back fire was still there until one day the fire went out and she would not start,I put the old coil back on and she fired right up,o.k,I got a bad accel.so I put a new one on,ran fine,I could put my foot in her and she ran like a 327 should run...until this weekend...the back fire is back,now this is two coils in probably 1000 miles...any ideas?,thanks
Thread Starter
Heel & Toe
Joined: Dec 2013
Posts: 21
Likes: 0
Le Mans Master
Joined: Aug 2006
Posts: 7,417
Likes: 1,554
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
With the key ON and the wire disconnected from the + side of the coil you should have 12 volts. (battery voltage)
Instructor
Joined: Nov 2014
Posts: 161
Likes: 17
From: Georgia
Also check distributor centrifugal advance & vacuum advance mechanisms to make sure they are moving freely and not sticking at times. Had a bad vacuum advance once that allowed the breaker plate to float around at will, not good.
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Le Mans Master
Joined: Dec 2006
Posts: 8,837
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If that resistor wire has been replaced or bypassed, the coil will overheat and fail.
Le Mans Master
Joined: Aug 2006
Posts: 7,417
Likes: 1,554
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
