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Old 11-08-2012, 12:40 PM   #8
felm0001
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Join Date: Sep 2012
Location: GA
Posts: 8
Re: 250 HEI Timing, vacuum advance question

Ok here is the results from today,

I tried 0 initial advance and that didn't work out. My theory is that more advance is needed to solve the misfire issue.

I went up to 12-14 and it ran smooth, but when it throttled up there was black smoke and unfired fuel out the pipe. I reduced the vac advance and it only made it worse. I found that more initial advance fixed the misfire on the throttle up. (please correct me if I am wrong, those are observations not mechanical facts)

So now I have teased the initial timing set way advanced off the balance scale, but there is no misfire and she runs strong at 500 rpm. I have the vac can wide open @ 9deg advance.

**She throttles up fine, but now on the way down there is misfire and black smoke out the pipe. I tired more initial advance and everything got worse, I tried less initial advance and same result. I tired backing off the vac advance and it was worse. Teased the fuel mixture screw on the carb and no joy.

any ideas?

Last edited by felm0001; 11-08-2012 at 12:57 PM.
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