89 accord timing
 

I hope someone can help me figure out this issue with my 89 accord lxi sedan
timing. It knocks in hot weather and I want to retard the vac advance a
little more. The timing is supposed to be 15+/-2 btdc with hoses on. The
most I can retard it is about 16-17 degrees, barely in range. with vac
hoses disconnected and plugged it is supposed to be 4btdc, but at the proper
vac advance, I am at TDC. Does anyone know how to back off the vac advance
without affecting the plugged (no-vac) advance?

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