Technical Information · 6/09 ENU 0335 0

Service Technical Information 6/09 ENU 0335 0 Vehicle Analysis Log: Evaluating Over-Revving Events (Boxster/Cayman/Carrera) (6/09) Vehicle Type: Boxster (986)/Boxster S (986) 911 Carrera (996)/911 Carrera 4 (996) Model year 1997 to 2004 Vehicle Type: Boxster (987)/Boxster S (987)/Cayman/Cayman S 911 Carrera (997)/911 Carrera S (997) Model year 2005 to 2008 Vehicle Type: Boxster (987)/Boxster S (987)/Cayman/Cayman S 911 Carrera (997)/911 Carrera S (997 Model year as of 2009 Concerns: Evaluating overspeed events using the Vehicle Analysis Log (referred to below as “VAL”). Situation: Damaged unit parts due to high engine speed. The information below is intended to help you to evaluate engine damage, which may occur as a result of one or more overspeed events. Using the values entered in the VAL, you can also evaluate the assignment of “Porsche Approved Warranties” better and check entitlement for processing repairs under warranty and goodwill, for example. Engines are designed to operate at a maximum permitted speed. This engine speed is not exceeded when the vehicle is driven normally. However, driving and operating problems (e.g. “changing to the wrong gear” on vehicles with manual transmission) or manipulation (e.g. tuning) can cause the maximum permitted engine speed to be exceeded when the vehicle is driven. Overspeed events are stored in the DME control unit. The following values are also recorded: - Number of ignition attempts in each overspeed range 1 , and, - Status of the hourmeter during the last overspeed event 2 . 1 Overspeed range = Defined rev ranges with classification of expected engine damage, e.g. engine damage possible, ... probable, ... very probable, engine damage has generally occurred; see section 'Rev ranges'. 2 For technical reasons, overspeed events are entered in a preset time interval. As a result, there may be entries in a higher rev range (e.g. range 2), while no entries are stored in the lower range. Typical faults and symptoms as a result of overspeed events may include the following: • Damaged valves and/or pistons (impact marks on the valve, valve impressions on the piston, valve bent). AfterSales AprPage10,1 2024of 4