DME 7.8 DME 7.8 0 · Perform system test for small lift

DME 7.8 DME 7.8 0 Perform system test for small lift Warning! Test is carried out while driving. Have a second person oper- ate the Porsche System Tester 2. System test for small lift means that faults are detected if a valve remains jammed at large lift (fault type: below limit). Several cylinders may be stored as faulty, although only one valve on one cylinder is faulty. As a rule, only the cylinder bank with the faulty valve can be detected. Therefore in the case of a fault, the flat-base tappets of the inlet valves of the entire cylinder bank must be replaced. A faulty flat-base tappet can be detected because the oxygen sen- sor FR for this cylinder bank enriches the mixture (FR > 1) during acceleration with wide-open throttle see drawing below. Differ- ence from the other oxygen sensor > approx. 15 %. In the case of a fault, the flat-base tappets of the inlet valves for the entire cylinder bank must be replaced. A B 2470 P0306 0-49 page 9 Printed in Germany – 4, 2002 p0306