My 89 305 tbi will not time right. When I disconnect the tan bypass wire and set it to 6-8 deg. BTDC it runs pretty smooth , but when I hook the wire back up it backfires and barely runs. Do you think the distributer is worn out. fuel system seems to be working well.. anybody seen this before?

 

well are you reconnecting it while it is running?.. I know it sounds stupid but people have done it.

 

I did shut it off before reconnecting,I wonder if its an ESC problem . still looking into it

 

have the same problem any replies????

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87 IROC WITH 409(.060OVER400) MINIRAM,NOS(125HP)TRICK FLOW PORTED HEADS,C.C.CAM,FLOWTEK HEADERS,CUSTOM PROM,MODIFIED 700R TRANS,2400 B&M CONVERTER,3.73POSI REAREND.
LOOKING FOR THE 11 SEC. ZONE.

 

is it possible that a bad knock sensor is telling the ESC to retard the timing so far that the engine hardly runs?

 

found the problem. It was a bad pick up coil.