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"I feel that the O2 and the knock sensors are fine and something else is causing the problem."
Ray,
I don't know about the knock sensor, but two O2 sensors have told you (2-3-2) that indeed there is something wrong. The fuel mixture is requiring abnormal corrections, according to the Regina Green Book, which defines the 2-3-2 code as:
"2-3-2 Adaptive lambda control too lean/rich when idling"
it goes on to say:
"The adaptive system has compensated for swift changes in the Fuel/air mixture." ["swift" underscored in Green Book]
I'd guess that going lean is more likely than going rich. Maybe a leaky intake manifold gasket affecting just one cylinder or a single injector seal.
I like to use Propane to test for vacuum leaks. It's less messy (and no more volatile) than carb cleaner or similar 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 gas valve and poke the end of the hose around each injector for a couple of seconds. If the seals leak, you should hear an RPM change when the propane gets sucked in and burned**.
Do the same around any other suspected areas, like hidden vacuum hose ends and don't forget the intake manifold gasket itself.
**If you use a Digital Volt Meter to "read" the O2 sensor output voltage at the firewall connector, I think you'll see the voltage rise instantly if any propane gets drawn in.
NOTE: As yet I haven't needed to do this test on my 940, so it's an only an educated guess.
EDIT: The Green book also suggests "low fuel pressure" as a possible cause for 2-3-2.
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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