383 240z Posted November 17, 2002 Share Posted November 17, 2002 I put new plugs in the car this morning in my attempt to tune the carb. It is running VERY rich. I started the motor and after it came off of choke the plugs were fouled out so bad the timing light would not fire. Is there a way to lean the choke circuit? I dont know much about carbs so any help would be helpfull!!! The motor is a stock 350 with a 700r4 the carb is an off the shelf 0-80508S with vac 2nd and eletric choke Keith Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 18, 2002 Share Posted November 18, 2002 Generally on electric chokes theres like three screws that hold down a black circular housing, you loosen the screws and rotate it one way or the other, they usually actually have letters on the deal saying rich or lean showing what direction to turn it. You may want to try leaning your two idle screws in the primary metering block (the deal right behind the float bowl on a holley) as the choke circuit really just restricts the air (I believe) and causes the mixtue to go richer, its not a enrichening circuit as far as I know. I don't know about holley stock numbers, but some holleys (with a colored ring around the mixture screw) actually work backwards, screwing them out leans it out instead of richening it like the other holleys. I believe these are emission legal carbs though. Those are about the only circuits that come into play until the RPM's get up a bit and it switches to the low speed jets also in the primary metering block behind the front float bowl. Thats about all I know about Holleys, but I hope that helps a bit. Good luck with it. Regards, Lone Ps: That was a holley carb right? If its a edelbrock, thats a different animal, but it still works the same as far as choke and idle circuits. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 18, 2002 Share Posted November 18, 2002 Lone is right about the electric choke, loosen three screws,then turn until flap opens slightly.Holley has no idea what climate you live in,so they might have set it a little tight.I recently put one of the newer emissions carbs on a motorhome,and it was different than my older 600 vac secondary.the older air/fuel screws work like a faucet.In = less fuel /out = more fuel.the new carb is an air bypass screw so it is the opposite since you are now adjusting air and not fuel.These only effect idle.I also had a serious rich condition.On the side of each bowl ,about halfway up,is a brass plug.This is where you check the float level.Remove the plug.If fuel seeps out,the float is too high.The brass screw and locknut on top of the bowl is where you adjust that.If a lot of fuel runs out(as in my case)there may be something wrong inside the bowl,Like the E clip popped off and the float is hanging off to one side all crooked.After that I had no problems.Theres really no magic.If you know how a toilet works,it wont be a problem. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted November 18, 2002 Share Posted November 18, 2002 if its that (RICH) it sounds like, one or more of the following problems are involved here (1) the float levels are set WAY too high. (2) needle/seat stuck or deffective (3) fuel pressure set way to high first check that the fuel pressure is no higher than about 6.5lbs and the float levels are set so the gas level stays just at the bottom edge of the sight hole at idle and when the rpms start to build up. Start the car. Check again for leaks. Remove the brass sight plug from the side of the float bowl, being careful not to drop the gasket. The fuel should be right at the bottom of the hole, maybe dribbling out a little. If it's not, with your 5/8" wrench and a large flatblade, loosen the large screw on the top, turn both the screwdriver and wrench as a unit, then tighten the screw. Clockwise will lower the level, counterclockwise will raise the level. Note that if you lower it, you'll have to rev the engine to use the fuel that's already in there. When you get it right, put the sight plug and gasket back in. Check for leaks. here read this http://www.bob2000.com/carb.htm http://www.bgsoflex.com/holley.html Quote Link to comment Share on other sites More sharing options...
383 240z Posted November 19, 2002 Author Share Posted November 19, 2002 I installed a set of clear sight plugs tonight.I dont see any fuel with the motor running. I have the fuel psi. set at 6lbs. I may try to back it down a bit(4.5 or 5lbs) I cant wait to get this thing running right the guys at work and the parts store are driving me nutz to see it. Quote Link to comment Share on other sites More sharing options...
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