Thread: Oscillating idle

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Originally Posted by BigTruckDriver

Get a vacuum gauge, they are pretty cheap. Hook it up to the intake and read the movement of the needle.

i have one

Does sound like super lean or a vacuum leak... you said vac is at 22"? Then over lean more likely.

How much cam you got? Might just want a higher idle?

Two cents...

-Chris

my cam is 216/216 @ .05 .515 lift

vacuum is reading from 20 to 15 @ idle

and the vacuum is @ 22 @ 1,500

i thought u want the highist vac when u are tuning your carb?

If you're running power brakes and I'm assuming you are, I'd plug the line to the brake booster and one by one check any and all vacuum lines. A leaky cannister under the dash could cause your problem.

cam looks tame enough... yes, you want highest vac at lowest revs (or whatever revs you want idle at)...

Did it run ok in the past? Are all the cylinders firing (plugs, wires, caps)?

-Chris

this is a rebilt engine and it isnot in the car yet thats for next year

Sure your not runnin' Injected Alcohol? J/K

Originally Posted by pro70z28

Sure your not runnin' Injected Alcohol? J/K

umm? i dont think so

one of my frends was telling me it might be my vavles there not closing all the way? when i set preload i did 1/2 turn on the wrench. what do u guys think?

well what would that do?

well yeah that dusint sound like what i am doing

well me and my friend were looking at the engine and tring to figure out what is up with it. well i tried to spray carb claener down the carb in little squirts and it seemed to smoothe out but when i tried propane or mapp gas nothin.... i am tring to beleave it isn't a vac leak becuse i have seelant on every thing. so i think it is a leen out on the idle but on 3 carbs?
a another thing i am thinking is might it be that my timing set is off?

i posted befor the site whent down and just wont to make shure ppl see this