Posted by papaw8 on November 12, 2020 at 06:08:53 from (184.62.2.98):
In Reply to: Chevy engine experts? posted by svcummins on November 11, 2020 at 19:13:07:
Backfiring and farting sounds like lean mixture or intermittent ignition. Also intermittent valve sticking.vacum gauge holding steady at idle says valves are fine at idle. If the trouble is when you accelerate I would suspect accelerator pump.shut off engine , look down carb, open throttle, you should see two streams of gas squirting down carb throat. This should start as soon as you start to move the throttle. Some of those accelerator pumps are leather. There is a discharge ball that may be stuck or missing. Connect timing light set timing at idle with vacum hose disconnected from advance and plugged. Then increase throttle slowly and watch timing marks. Timing should advance (centrifugal advance). Then hold throttle about 2000 rpm and connect vacum advance hose. Timing should advance further(vacum advance). Don't set initial timing too high on heavy trucks.
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