Loyale Sedan (4 Door) 4WD F4-1781cc 1.8L SOHC Turbo (1990)
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If you suspect an engine problem, connect a vacuum gauge to the intake manifold.
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Note the location and action of the vacuum gauge needle.
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Use the information in the bulletin to determine the engine problem.
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Correct the engine problem before doing extensive calibration work on the transmission.