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[T3] Backfiring at 2000 RPM and higher
<x-flowed>Hi,
I'm trying to resolve a problem where my '68 Notch starts backfiring as the
engine speed increases. I think it's backfiring through the exhaust, and
not the carbs, because the sound is accompanied by a puff of blackish smoke
from the exhaust. It sounds like it's running great at idle.
Timing and dwell appear to be set correctly. Also, I've checked the timing
advance with a strobe light, and it appears to be advancing. I would hazard
a guess of 15% BTDC when the idle increases to 2000 RPM, but that's a just a
guess. My distro number ends with 009, and there are no vacuum lines
connected to it.
Before this happened, I did two things:
1) Repaced the points. The guy at the parts store wasn't sure which points
I needed, so he had me bring in the old ones and he compared them, and they
appear to match.
2) Checked the compression. This might be relevent because I may have
disturbed the electrical connection to my left side carb's cut-off jet, when
I was trying to get my tester connected to #3. I searched through the
mailing list archive and lack of power to the cut-off jets has been listed
as possible backfiring culprit before. Compression was 1-90, 2-95, 3-105,
and 4-95, which from what I've read is within the acceptable range.
When I get home from work today, I will check the cutoff valve conn to
ensure it has power. If it looks ok, I'll put my old points back in.
Can any of you offer other suggestions on what I can check if these two
avenues fail to identify the problem?
Thank you,
Gary
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