After reading one of the recent timimg posts and the vacuum tech article, I bought up a vacuum gauge to try to help with my new weber install problems. Ive been working through most problem areas trying to eliminate errors.. drained the tank for old gas issues, new fuel filter.. etc. All componetnt are mounted to new gaskets on a fresh engine rebuild. I originally thought vacuum leaks were my problem, but got no fluctuation in running by spraying everything w/ carb cleaner. After hooking up the vac gauge, I am having a hard time figuring out what my problem is after comparing to the diagnostics in the vacuum tech table from this site. My vac reads as follows: I cant keep the motor running at a normal idle.. it slowly comes up and down and wants to die, I have to dial in the idle speed screw to keep it from dying.. Using my Dwell/Tach, the idle speed which it will stay running at is about 1300 rpm and the vac reading at that speed is a fairly steady 15.. If I blip the throttle, it goes to zero than out to 22, then back to 14/15. If I slowly let the engine die back to about 600-800 (near normal idle speed) while feathering the throttle to keep it running, I get a vac reading of about 10.. I dont know if this means I have a vacuum leak, or if vac is dying off as the motor sputters and pops at the low engine rpm? I figure it is probably a vac leak, as the hesitation and flat spots when depressing the throttle are not apparent when the engine speed is elivated with the electric choke activated. Any vacuum gurus out there have any advice? The chart in the tech article is nice, but doesnt tell me what the readings will do when you cant keep the engine at a normal idle/baseline. I guess I am trying to figure out if vacuum increases with rpm, or if it should remain fairly constant? Also, What type of gasket sealers do you guys use to seal threaded areas and gaskets in these areas (manifold, carb gaaskets, studs, etc).
Thanks,
Mike
Thanks,
Mike