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Re: Vacuum Leak! Easy Check Method? 700 89ti

posted by  someone claiming to be Steve Ringlee on  Tue Jan 2 08:23 CST 2001 [RELATED]

Gene, the carb cleaner idea works best around gaskets and fittings, not the rubber parts of the hoses. For hoses, just take a hard visual look for cracking, splits, tears, loose ends, etc. The big air intake corrugated hose can deteriorate in the corrugations, especially around the IAC intake, so feel around to see if there is a split. If you've got a turbo, pay close attention to any hoses/pipes from the AMM to the throttle body, especially around the clamps on the turbo. Run the engine at boost and have someone spray the cleaner around the clamps to detect any pressure loss outwards. Also, feel around the flame trap to make sure the hose fits snugly and doesn't allow vacuum loss; spray here too.

You might put a vacuum gauge on a throttle body vacuum fitting and test for actual vacuum and variations while the engine is running.





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