Regal V6-3.8L VIN K (1997)
Vacuum Modulator: Testing and Inspection
Causes of Improper Vacuum at Modulator
1. Inspect the engine for the following conditions:
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Inspect the engine for a tune-up.
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Inspect for loose vacuum fittings.
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Inspect for improperly routed hoses.
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Inspect for improperly routed lines.
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Inspect the hoses for a vacuum-operated accessory leak.
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Inspect the vacuum valve, etc., for a vacuum-operated accessory leak.
2. Inspect the vacuum line to modulator for the following conditions:
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Inspect for leaks.
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Inspect for loose fitting.
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Inspect for restricted orifice.
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Inspect for incorrect size orifice.
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Inspect for carbon build-up at the modulator vacuum fitting.
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Inspect for a pinched line.
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Inspect for grease in the pipe (delayed and/or no upshift-cold).