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finding vacuum leaks with smoke generator 700

uid 18083's pic
posted by  lucid on  Tue Mar 2 04:27 CST 2004
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I use Propane to test for vacuum leaks (less messy than carb cleaner or other sprays). Take the nozzle tip off a propane torch and replace it with some snug fitting rubber hose about 2 feet long. Practice with the valve to get a moderate gas flow (not a roaring blast).

With the engine at a warm idle, open the valve and poke the end of the hose around each injector for a couple of seconds. If the seas leak, you should hear the engine smooth out or rev up when the propane gets sucked in and burned.

Do the same around any other suspected areas, like hidden vacuum hose ends and the intake manifold gasket area.

To block any breeze from the fan, lay a piece of cardboard from the fan shroud to the engine.
--
Bruce Young,
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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