740 L4-2320cc 2.3L DOHC B234F (Can) (1992)
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NOTE: The ignition timing will also affect the manifold vacuum levels, verify the timing is correct prior to measuring the vacuum.
If the after-repair vacuum level is lower than the pre-repairs level this would be an indication that the timing belt may not be installed correctly.
NOTE:
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The vacuum checks should be made at similar engine speeds and temperatures.
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Check "manifold vacuum" at a source downstream of the throttle plates.