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b454rat said:
There is a much simpler way to do the timing on a TBI. Set the timing to where you want, no need to disconnectany wires. When you get it where you want, disconnect the battery for about a minute or so. Put the cable back on and your timing is set. Diconnecting the cable resets the computer, and adjusts itself.

this is incorrect to set your initial timing.If you knew what your total wanted to be at a certain rpm,maybe this would work.But, you would never knoww hat you initial was set at unless you disconnected the timing connector. You could end up being completly out of the timing map. Brett
 

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the ecm bases all adjustments based on 4 degreesBTDC. By your method, how does the ecm know that the timing was set at 4 btdc before making adjustments? It wouldn't. That is why you need to disconnect the timing connector, adjust the timing to spec(4 degrees on this aplication), reconnectt he connector and let the ecm take over. If you adjust it any other way, there is no baseline. The timing map is based on this procedure. With your method, you could end up with 20 degress initial timing, and the computer would keep advancing timing out of the desired range. You probbaly got luck in the past.
Let say you had just installed the dist in the vehicle. If the timing was adjusted by your method to 4 degrees with the timing connector connected, the timing would be very retarded.

Brett
 
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