2013 Chevrolet Malibu
Mileage
79,232
Service Date
10/1/2021
Services Performed
- -TEST DROVE VEHICLE 20 miles /40 mins. ALSO LET VEHICLE IDLE IN SHOP FOR 30 mins. WAS NOT ABLE TO DUPLICATE THE CUSTOMERS CONCERN. -SCANNED THE VEHICLE TO SEE IF THERE WERE ANY CODES PERTAINING TO ANYTHING THAT WOULD CAUSE THE VEHICLE TO STALL. -THERE ARE MULTIPLE COMMUNICATION CODES STORED IN MULTIPLE BODY MODULES BUT NONE IN THE POWERTRAIN MODULE.(ALL CODES ARE HISTOYR/NOT CURRENT) -CLEARED ALL CODES AND CONTINUED TO RUN THE VEHICLE FOR AN ADDITIONAL HOUR. -NO CODES HAVE RETURNED AND THE VEHICLE HAS STILL NOT SHUT OFF. *CAN NOT DUPLICATE THE CONCERN AT THIS TIME *LET VEHICLE SIT OVER THE WEEKEND AND DROVE IT AN ADDITIONAL 28 MILES MONDAY MORNING AND WAS FINALLY ABLE TO DUPLICATE THE ISSUE. -WHEN THE ISSUE OCCURED, THERE WAS A CODE STORED P0017 CRANKSHAFT POSITION-EXHAUST CAMSHAFT POSITION NOT PLAUSIBLE. -IT`S NOT POSSIBLE TO TELL IT THE CODE IS BEING SET BY THE STALL OR IF IT IS THE CAUSE OF THE STALL. -THE ISSUE ONLY ARISES WHEN THE ENGINE TEMPERATURE AND AMBIENT TEMPERATURE IN THE ENGINE BAY IS HIGH, SO THE VEHICLE HAS TO BE DRIVEN AND IDLED FOR LONG PERIODS OF TIME IN BETWEEN TESTS. AND ONCE THE VEHICLE STALLS, THE ISSUE STOPS BEING PRESENT ALLOWING THE VEHICLE TO RESTART AND RUN WHICH MAKES EVERYTHING TEST NORMAL. -CHECKED THE FREEZE FRAME DATA AND IT SHOWED THE CRANKSHAFT RPM AT 580RPM AND THE CAMSHAFT RPM AT 0 RPM. -MONITORED THE LIVE DATA OF THE RPM READINGS DURING THE STALL THOUGH AND THEY MATCH COMPLETELY (NO VARIATION). -DISCONNECTED THE CAMSHAFT ACTUATOR SOLENOIDS AND RAN VEHICLE IMMEDIATELY AFTER A STALL ONCE THE VEHICLE WAS ABLE TO BE RESTARTED (VEHICLE HAS TO BE RUNNING BEFORE DISCONNECTING THE SOLENOIDS). WITH THE ACTUATORS DISCONNECTED, THE VEHICLE CONTINUED TO RUN AND WOULD NOT STALL. -DUE TO THE VEHICLE NOT STALLING WITH THE CAMSHAFT ACTUATORS UNPLUGGED THE ISSUE IS MOST LIKELY SOMEWHERE IN THE CAMSHAFT TIMING SYSTEM. *NEED MORE TIME TO CONTINUE TESTING INTO THE CAMSHAFT TIMING SYSTEM -CONTINUED WITH TESTING OF THE CAMSHAFT ACTUATORS. -THE ACTUATORS SEEM TO BE WORKING NORMAL WHEN COMMANDED BY SCAN TOOL. -CHECKED TO SEE IF THE STALL WAS STILL NON PRESENT WITH THE SOLENOIDS UNPLUGGED AND THIS TIME IT STALL WITH THEM UNPLUGGED. -DURING DRIVING THERE WAS AN EVAPORATIVE EMISSION SYSTEM CODE STORED P0449 EVAPORATIVE EMISSION VENT SOLENOID VALVE CONTROL CIRCUIT. -DUE TO THE EVAP CODE SHOWING UP THE THOUGHT PROCESS WENT TOWARDS THE POSSIBILITY OF THE VENT VALVE BEING STUCK OPEN AND WHEN THE PURGE SOLENOID OPENS, IT IS POSSIBLY PULLING UNMETERED AIR IN THROUGH THE GAS TANK/EVAP SYSTEM CAUSING IT TO BECOME LEAN AND STALL. -TO TEST THAT THEORY, BLOCKED OFF THE EVAPORATIVE EMISSIONS SYSTEM COMPLETELY FROM THE ENGINE AND RETESTED. -THE VEHICLE STILL STALLS AFTER ABOUT 30 MINS/30 MILES OF DRIVING, SO THE EVAP SYSTEM IS NOT TO BLAME. -CHECKED FUEL PRESSURE DURING STALL, ALL OK (60PSI ON LOW SIDE, 495 PSI ON HIGH SIDE) -MONITORED OXYGEN SENSOR VOLTAGES LEADING UP TO THE STALL, ALL SENSOR READINGS SEEM NORMAL. -MONITORED MASS AIR FLOW SENSOR READINGS DURING THE STALL (NORMAL). -RESET THE FUEL TRIMS, RESET THE IDLE LEARN VALUE, AND PERFORMED THE CAM/CRANK VARIATION RELEARN PROCEDURE, NO CHANGE. -CAMSHAFT AND CRANKSHAFT SENSOR RPM READINGS STAY PRESENT DURING STALL (MEANING THAT THE SENSORS ARE MOST LIKELY NOT THE CAUSE). -HAVE DONE A LARGE AMOUNT OF RESEARCH FOR OTHERS WITH SIMILAR ISSUES AND DUE TO THE CAMSHAFT CORRELATION CODE THAT SEEMS TO KEEP RETURNING AFTER STALLING, SUGGEST REPLACING THE VVT ACTUATOR SOLENOIDS AND RETEST. *THERE IS A POSSIBILITY THAT REPLACING THE CAMSHAFT ACTUATOR SOLENOIDS DOES NOT FIX THE ISSUE BUT DUE TO THE FACT THAT NO OTHER PROBLEMS CAN BE FOUND, IT IS A STARTING POINT. **RECOMMEND REPLACEMENT OF THE SOLENOIDS WITH OEM UNITS DUE TO AFTERMARKET REPLACEMENTS OFTEN CAUSING MORE ISSUES.
- ADDITIONAL TIME TO CONTINUE TESTING CAMSHAFT SYSTEM
- -AFTER REPLACEMENT OF THE SOLENOIDS, TEST DROVE THE VEHICLE FOR 40 MINUTES ALONG THE SAME ROUTE THAT MADE IT POSSIBLE TO DUPLICATE THE ISSUE PREVIOUSLY, AND WAS N
JUILE T. gave our service a 5 star review on 10/5/2021
