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turbo whine/overboost
Posted by Nigel Phillips (more from Nigel Phillips) on Fri, 31 Mar 2006 05:36:46
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Help/advice please! November 1997 CSE automatic, no modifications, 130,000 km. Had the car since 12,500 km, dealer serviced at 8K intervals. All the usual replaced. New DCI last year. New APC 2 weeks ago due to low turbo pressure (mid yellow on hard acceleration). New serpentine belt tensioner at the same time. Overboost twice so far on hard acceleration with fuel cut-out but difficult to repeat (interesting when you're in a difficult traffic situation). No white smoke on starting, play in turbo shaft unknown. Checked yesterday with the mechanic, turbo base and boost pressure at specification (135-185 kPa). No codes (but they may have gone from memory). Filled with premium gas this morning (93 octane? this is Canada), and now the turbo gauge is fluctuating rapidly between half yellow and the start of red on acceleration (80-120 km/hour). No check engine light. Noticable whine from the engine related to turbo pressure/acceleration since a few days after the new APC. Whine goes away after acceleration. Any thoughts before I go back to the mechanic?
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