[big red 1]

every so often my truck wont start.it turns over but wont start unless i open hood and tap dist. all dist wires are fine new coil and mod.is there anything in there that is sticking?

 

[DaSouthWon]

need more info

 

[big red 1]

not much info when it does not start i have to bang on the dist.then it starts hei dist 350 chev.

 

[strummin67]

What does the inside of the distributor cap look like? Has only happened recently?

Strummin

 

[DaSouthWon]

I guess I would start with the basics. Air, Fuel, Spark, and maybe compression. I'm guessing your problem is spark. Tapping on it makes me think there could be a short somewhere. The first things I would probably check would first be my coil wire or in your case the cap with the coil in it to make sure your getting a good connection to your rotor. Then for wear or corrosion on your rotor. Make sure there is no arcing problem from a cracked cap or worn wire. If the engine is not turning over I would probably check for a loose cable first then your starter. Some times you can bang on a worn out starter and get it to work. This may be whats happening when your banging on your dizzy. Hope this helps