hi there

i'm still learning "Y speak" but this is a wonderful place to learn     20*  btdc should that be nearer to 10*??

the other guys will better advise

best of luck

stuey

Try backing the timing off to about 10 degrees.  Too much timing will cause erratic idle.  Cupping you hand over the carb will also act as a choke and richen the mixture slightly.  Maybe it's too lean at idle.

John - "The Hoosier Hurricane"

I think he's including vacuum advance with the initial timing.


Lawrenceville, GA

Power brakes??  A bad booster drove me crazy one time.

is this a stock motor  what carb do you have I put a 4 barrel on my 312 y 600cfm holley and it did the same thing I rebuilt lot of carbs  turned out it was to much carb for that application change to a smaller 4 barrel holley 350 to 400 and it ran like a top  maybe you have to much carb for your engine  just a thought shakey

Sorry to be so blunt but WHY should we have to guess your problem " 1964 292 Y block in my F-100 I am at my wits end, I rebuilt the carb, installed new intake gaskets, and this thing still idles crazy, up, down, stalls when I come to a stop, it is acting like it has a big vacume leak." YOU TELL US. What is the manifold vacuum? It should be simple.

All I was doing was asking for ideas on what to look for, if it bothers you that I asked for information, then skip to another topic and don't bother to offer an opinion,insite,or suggestions. Sorry for being BLUNT! But I am not a mechanic, and do not have a Vacume GAuge but thanks for the tip I will get one and check it out, I would ask you what it should be but why would you tell me since you don't wanna GUESS whats wrong, or help!

 I am including the vacume advance with the inital base line timing, sorry I was'nt clear on this, It was at 30, So I backed it to 20 and 10, it seemed happier between 10 and 20, so I left it around 15..

It is the stock 2 barrel

I think you will find - as youi build up your know-how with the Y-motor - that setting the initial advance with the vacuum line off the distributor and plugged (to avoid a vacuum leak) - will net you much more consistent tuning results.

Spark advance increases made at low rev's - increase the engine vacuum - which (if you leave the vac pot hooked up) then causes the engine to increase the vacuum still more. Not the best idea for achieving a repeatable adjustment.

I don't know if this link is still live .....but it had some interesting live graphics... 

http://www.users.bigpond.com/ergoff/vac1.htm

turned out to be dead - try this one......

http://www.classictruckshop.com/clubs/earlyburbs/projects/vac/uum.htm

 
 Steve Metzger       Tucson, Arizona