MassMan
1/2 ton status
Well, it's a little more than just idling. My blazer's got a crate 350 that i replaced a blown head gasket last winter right after i got the thing. so far, it hasn't run well enough to drive since. it had a lot of carb issues that i worked out myself, but it still doesn't like me.
for a week now, i've gone out to the truck, pumped the gas pedal once and it fires right up. it starts at 15" hg vacuum and 1100 rpm and it runs like it just needs a tune up for about 30 seconds. after that, the vacuum takes a nose dive, the engine starts chugging and misfiring, and it eventually slows and stops, at which point i can't get it to fire up for maybe 3 hours or so when the whole process starts over again. if i don't give it gas after it starts, it rill run for maybe 45 seconds or a minute. i can rev the engine to keep it going, but it still runs horribly.
today i tried it with all the vacuum accessories disconnected and the ports plugged, but there was no change. the carb (a Holley 4 barrel) used to pour gas down the intake from the vents, but i replaced the floats. the front bowl has a good fuel level, the rear i have just lowered the level to the minimum setting because none is used at idle and i don't think i can set that until i can get the engine above idle. i spent weeks making sure the timing wasn't 180* out of adjustment when i put everything back together, but i am planning to double check that tomorrow.
anyway, after all that any ideas?
for a week now, i've gone out to the truck, pumped the gas pedal once and it fires right up. it starts at 15" hg vacuum and 1100 rpm and it runs like it just needs a tune up for about 30 seconds. after that, the vacuum takes a nose dive, the engine starts chugging and misfiring, and it eventually slows and stops, at which point i can't get it to fire up for maybe 3 hours or so when the whole process starts over again. if i don't give it gas after it starts, it rill run for maybe 45 seconds or a minute. i can rev the engine to keep it going, but it still runs horribly.
today i tried it with all the vacuum accessories disconnected and the ports plugged, but there was no change. the carb (a Holley 4 barrel) used to pour gas down the intake from the vents, but i replaced the floats. the front bowl has a good fuel level, the rear i have just lowered the level to the minimum setting because none is used at idle and i don't think i can set that until i can get the engine above idle. i spent weeks making sure the timing wasn't 180* out of adjustment when i put everything back together, but i am planning to double check that tomorrow.
anyway, after all that any ideas?
