The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 55.2-59 My 1956 Chevy Truck won't start

1project2many · 06-06-2018, 07:36 AM

Black plugs = too rich. Running with choke on for too long can do this. If the carb is leaking fuel into the manifold you can also get too rich mixture. Pull and check new plugs before trying to start. If they are already black then the fuel mixture was too rich when you tried to start it yesterday. Clean all the black off the plugs before trying to restart (DON'T use a wire wheel!). The carbon that built up can short electricity to ground creating "no spark" plugs.

06-06-2018, 07:36 AM	#22
1project2many Registered User Join Date: Mar 2012 Location: Lakes Region NH Posts: 3,160	Re: My 1956 Chevy Truck won't start Black plugs = too rich. Running with choke on for too long can do this. If the carb is leaking fuel into the manifold you can also get too rich mixture. Pull and check new plugs before trying to start. If they are already black then the fuel mixture was too rich when you tried to start it yesterday. Clean all the black off the plugs before trying to restart (DON'T use a wire wheel!). The carbon that built up can short electricity to ground creating "no spark" plugs.