Timing mark jumps around

[MegaOlds]

I finally got the engine run and not die when given throttle but now when trying to time the engine, the timing mark on the harmonic balancer jumps around. I don't mean a few degrees here or there... It jumps around and never stays in one spot. I checked the plug wires and they are all snug and the distributor is brand new. Also, the vacuum advance on the distributor is plugged and so is the line to the carb. Any ideas on what to try next?

 

[deanlemans81]

Check for slack in the timing chain or check the balancer to see if the outer ring moves seperatly from the inner ring. Sometimes the rubber between the two breaks apart and allows them to move in relation to each other.

 

[CWPottenger]

Also check your timing light. I have had those go bad in the past and they do weird stuff. Some digital lights and Multi spark ignition boxes do not get along also.

 

[MegaOlds]

K I will check those. Thanks!


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[foxtrot]

Is your CCC in diagnostic mode? Is your magnetic pickup on spark plug number one?