falls on face
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Instructor
Joined: Nov 2006
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From: fairfax va
falls on face
please help,my 1980 sbc350 falls on its face at 3200rpms in all gears but its most noticed in 1st gear. specs:350 L98head, compxe 268, 600holleyvac, holley w/reg@7psi,pro recurved hei. when it falls it is smooth, not broken up,if i stay on it and shift a gear pulls great then goes flat again. any advice would be great
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by steve dalla
,......... 600holleyvac.........,
Race Director
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From: Wellington, FL
St. Jude Donor '11 thru '25
If you have changed the fuel filter, perhaps filters if not stock, I would next check fuel pressure. You have to keep eliminating possible problem areas, starting with the easiest, then next easiest, and so forth. Keep in mind that there is always the possibilty that fuel is not the problem here, and that it could be electrical. That's what trouble shooting is all about. Good luck.
Race Director
Joined: Sep 2004
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
well why not immediately turn the car off when it starts to "stumble " and check your float level......that should give you some indication where the fuel starvation problem is coming from....do you have sight windows on the carb?
Race Director
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by steve dalla
fuel pres. @7 psi, i dont have sight windows but fuel runs over the edge. could changing the vac.secondary springs to the short one help this problem,currently stock setup.
well it couldn't hurt....if you buy the spring kit use the white spring its the lightest one.....what are your jet sizes?
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5th Gear
Joined: Nov 2006
Posts: 5
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From: Wisconsin
could be you advance jamming up
just a few ideas, if you have a fuel gauge that's showing 7 psi, and the filters arent clogged...
run some fuel cleaner through the system to make sure there aint any water or anything in there that's just replacing your gas at some spots
pop the distributor cap, and check your advance mechanism, make sure it moves smooth, i've seen some rust and seize up funny on friends motors
i'd also check spark plugs and make sure they look like a light tan color and if you have a fuel problem they'll probably show something
check throttle linkage and make sure it moves smooth...
then i'd check your ign. coil and ign. module
gl
run some fuel cleaner through the system to make sure there aint any water or anything in there that's just replacing your gas at some spots
pop the distributor cap, and check your advance mechanism, make sure it moves smooth, i've seen some rust and seize up funny on friends motors
i'd also check spark plugs and make sure they look like a light tan color and if you have a fuel problem they'll probably show something
check throttle linkage and make sure it moves smooth...
then i'd check your ign. coil and ign. module
gl
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by 84dragbird
........
check throttle linkage and make sure it moves smooth....
gl
check throttle linkage and make sure it moves smooth....
gl
thats a really good idea......make sure you can get WOT smoothly