[catbalu42]

I have a 350 in 86 Astro.I hooked up a inline spark tester and when cranking the motor I get 3 sparks. 2 small and one big. Is this nornal or do I have a problem with my distributor.

 

[gtkane]

Could you provide a little more info?

What do you mean 3 sparks? Are you suspecting ignition problems for a rough running/no start issue?

 

[Big_kid]

That's not normal! Do you have spark @ ALL the plugs? I once had an oil pump seize on me RIGHT AT #1 firing position. When I'd crank it, it would open & close the points making spark @ #1 plug. The rotor wasn't turning, so I get nothing at the other 5 plugs.

Check the other plug wires, make sure it's timed correctly, make sure you have NEW PLUGS, (I've fouled sets in the driveway troubleshooting, 0 miles). If you DON'T have spark @ all 8, and the cap/rotor/wires are good, I'd suspect the module under the rotor has gone bad.

1 more thing- do you have a known good coil to try? :chevy: