Hey y'all, Im at my wits end..... I have a 67' 327, converted pcv system to the valve covers, swapped out intake to a Edelbrock 2701 performer intake and a Edelbrock 600cfm carb. Starts and idles just fine, goose her and she revvs right up. Put it in gear and rpms drop and she dies. I can feather the gas to keep her running while stepping on the brake. Keep her at @900 rpm acts like she is supposed to.... Come off of the gas she will die. Timing is on, checked for vacuum leaks and none to be found, Carb is brand new. ..... Does have the draft tube in the rear of the block and I have that plugged. Am I missing something obvious?... This Bi&$% is driving me nuts... Take her out driving and she runs like a striped ape.... Thanks for any input y'all can give me..
Turn the idle screw in a little on the linkage. Not enough rpm, maybe your converter is too tight. Then set the idle mixture screws per the instructions.
Yes sir... Have a push pvc on the passenger valve cover, vented breather/oil fill cap on the drivers side.... I set the timing to initial of 12 degrees
As you’ve changed the intake I’d be looking for a vacuum leak, ie intake not sealing properly to heads or carb.
Maybe the leak is via the lifter valley???? Have you tried richening the mixture and seeing if it does anything? Is the carb new?
Well, if it won't run at 950 you need to set it higher until you figure out if you have a vacuum leak or something.
Look down the carburetor at idle. Is there fuel dripping out of the venturii's? There shouldn't be. If there is, you are trying to idle on the main metering system rather than the idle system. That means that the idle system is either too lean or the system isn't working (plugged up). I had an Edelbrock carb that ran on my truck for 8 or 9 years and worked perfectly. One day I was coming into a parking lot and it died when I let off the throttle. Something in the fuel system found its way into the carb idle circuit. It ran perfectly as long as you didn't try to idle. I went through the carb and could only get it to idle on half the idle circuit. The carb cleaner now days isn't like the old dip basket cleaners we used to have. A buddy who had just switched his hot rod to fuel injection offered me his Edelbrock for $100.00 and I jumped at the chance.
Yep. If pcv is working properly plugging it will give you a very slight change in idle. But if something is wrong with the pcv it’ll make a very noticeable change.
I check for vacuum leaks with starter fluid spray wit a stinger nozzle. I’ve found them in strange places on intakes edges.
Is gas dribbling in the venturis at idle? Just cause it's new means nothing Edelbrocks are finicky about float levels. Sounds like that, or vac leak.
Yes sir... it's a little difficult to get a good reading.. I am running a Comp Cams Thumper... that gives an incon
Thanks everyone for their input... So I ran it to temp double checked the timing.. put a vacuum gauge on and she is about 29-30.... I disconnect the pcv valve from the front of the carb and she jumps to 39-40... threw it in gear without the pcv hooked up and the nipple on the carb open and she didn't die in gear.... any ideas?
sounds like a defective or the wrong pcv valve.... 40 inches of vacuum? I don't think that is possible. most gauges only go to 30, your car should idle at 15-20 or so
Sorry.. reading the wrong ring on the gauge... it went from 12 to 16 after opening up the pcv valve.. leaving the nipple in the carb open and not plugged
let me get this straight, you left the nipple on the carb open as in you did not plug it and it got better???
that makes no sense at all. only thing it could be is the carb is super rich? and it needs the extra air to run? better look at the carb. is there fuel dripping off the venturis at idle? do your eyes burn when you stand behind it when it is running? what happens when you plug the carb port for the pcv?
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