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DIAGNOSIS AND TESTING - SRT4 During normal operation the SRT - 4 turbocharger will emit a very high frequency whistle at full boost During throttle tip-out, the surge valve will emit a light air “woosh” noise. If there is excessive NVH or TO identify the source of the concern, check for Diagnostic Trouble Codes (DTC’S) stored in PCM If there are no DTC’S stored, use the folling chart. CONDITION POSSIBLE CAUSES CORRECTION UNDERBOOST - 20.6 - 27.5 kPa and turbocharger lag at WOT with some air leak noise OVERBOOST - 103.4 kPa (10 psi) or more even at part throttle (could be as high as 137.8 kPa (20 psi) or more). A 9 Fluttering 9 noise can be heard during overboost. CAUTION: Engine damage can result from prolonged Overboost. Waste Gate control hose plumbing Refer to (Refer to 11 - EXHAUST UNDERBOOST - 27.5 - 62 kPa (4 - 9 horse laugh 9 on throttle tip-out. Surge valve control hose plumbing Repair plumbing (Refer to 11 - NORMAL BOOST - but 9 horse laugh 9 noise on throttle tip-out. Surge valve scroll and vacuum Reverse vacuum lines (Refer to 11 - UNDERBOOST - 0-20.6 kPa (0-3 9 howling 9 noise. Intercoooler plumbing hose Inspect plumbing and install (Refer Very rough idle TIP/MAP sensor hoses connected Inspect hosed (Refer to 11 - 11 - 14 EXHAUST SYSTEM AND TURBOCHARGER PT TURBOCHARGER SYSTEM (Continued) |