STILL have problems getting sufficient vacuum on 2,8L engine. Suggestions greatly appreciated.
Problem is engine does not develop sufficient vacuum to run emission controls nor sufficient vacuum to run dist. advance etc. correctly. Carb (vari-jet Rochester) running too rich due to low vacuum; two carbs applied and both act exactly same (to eliminate/isolate carb problem). BOTH carbs worked fine/perfect on other engine!
Compression is at top of specs. All cylinders equal in pressure. I rebuilt this engine about 3 months ago.
Mechanical timing is correct, alignment/position of cam/crank at index re: timing chain, etc. NOT a 'jumped' timing chain tooth, etc. Runs retarded after set up w/ #1 piston @ tdc and matched to vibration damper. Max. idle/max vac. occurs at ~ 20°TDC. No visible leaks at intake manifold with either ether or propane at manifold-block joints/gaskets. Engine will significantly *increase* rpm when ANY vacuum hose is pulled from intake manifold, so I'm pretty sure I dont have an intake manifold leak. Otherwise runs too too rich.
Only thing not tested is distributor control module and spark pick-up assembly in distributor.
ANY suggestions would be GREATLY appreciated. (damn engine is now heavily fouled with carbon)