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Old 09-26-2010, 09:52 PM   #1
red71cheyenne
Back in the sticks
 
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Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
Backfiring

Took the Blazer out for a trip around the block today, just to see how things were going and its backfiring through the carb. Checked the timing, it was off a little, so reset that. Still backfiring. Only does it when I step on the gas or it starts to lug hard. Idling is fine.

This is a 350 with HEI and an Edelbrock carb. Checked the wires, nothing touching, seem to be all in the right place. I also had rebuilt the carb not long ago, so don't think its that. I had thought it was my fuel pump and then it went out, so I just replaced it, so think the fuel pump is ok.

You guys have any other idea's? The haynes manual says maybe improperly adjusted valves, but not sure how I would check that. They aren't clattering.
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