1992 Toyota Cressida smoke

1992 TOYOTA CRESSIDA
150,000 MILES • 4 CYL • 2WD • MANUAL
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I have a problem in my car related to a smoke which comes out of the exhaust pipe. It seems to me as it caused by an excessive fuel enters to the engine but also i observed a vibration in the engine.
my question is what is the causes of the black smoke and is it related to the engine's vibration or is it another issue?
(may be the problem of black smoke is not related to the vibration)
Apr 25, 2008 at 3:55 PM
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RASMATAZ
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You have a rich mixture-more fuel less air could be caused by an open injector/s, a leaking pressure regulator, clogged return line ,or a coolant temperature sensor stuck in the open loop mode telling the computer to give more fuel when not needed.
Apr 25, 2008 at 5:25 PM