June 17, 2020
THE FIX OF THE WEEK JUNE 17TH, 2020
Every week, we review new fixes submitted by our Direct-Hit users and pick our favorite “Fix of The Week.” These are confirmed, experience-based fixes directly from technicians and shops. You can find this and over 3.5 million other confirmed fixes in Direct-Hit with a 14-day free trial. This week, our favorite fix is for a 2012 Buick Enclave whose exhaust smoked excessively following an oil change.
2012 Buick Enclave 3.6L (76k miles and well-serviced)
After having an oil change at a large local used car dealership, the customer complained about the engine smoking after starting the vehicle and a large amount of smoke came from the exhaust. The vehicle was sent for inspection and driven for a 2-mile test drive to confirm smoke from the exhaust (light blue and faint).
After pulling the front PCV line off of the air inlet hose and valve cover for inspection, there was little or no draw on the tube through the engine. Oil was found inside after pulling the air inlet hose from the throttle body, and going to the rear PCV line showed a good vacuum from the intake manifold. Sticking a small drill bit into the PCV fitting in rear valve cover increased vacuum draw through the front PCV line. Sludge build-up was suspected, and removing the intake manifold to access the rear valve cover confirmed the PCV fitting was clogged and not allowing proper ventilation of crankcase leading to oil pushing in from the front valve cover.
Replaced the rear valve cover assembly and rechecked the vacuum draw on the front PCV line, which improved and released no smoke from the exhaust on a long test drive.