Just wondering if anyone know of any "poor man's" techniques of
detecting vacuum/engine/intake air leaks by forcing smoke or compressed
air into an engine. There is equipment on the market but its well over
the $1000 mark.
Plumber's smoke candles only cost about $7, but they leave residue.
There needs to be a way to pressure feed the engine and passageways
with the smoke for it to find the openings.
I can't get my idle below 1200 using the throttle stop screw, following
the instructions on the sticker under the hood. I have plugged all of
the vacuum taps on the intake one-by-one and altogether (except fuel
pressure regulator, holds vacuum) and no difference in idle.
I am thinking injector O-rings, intake gaskets or something between the
vane meter and combustion chamber is allowing extra air into the
cylinders. Maybe even the head gasket since I have telltail signs of
oil leakage on the block, just under the head.
Thoughts? I would love to find the source of this unmetered air.