DoDo1975 Posted May 29, 2018 Share Posted May 29, 2018 My car just came back from the mechanic and had a tonne of work done, including PCV, bunch of hoses and valve job. There has been a persistent rough idle that remains. The cylinders all look good, there are no boost or vacuum leaks. Car runs perfectly when driving under load. Logged the rear O2 sensor andvoltage seems to go to 0 when engine under no load. Could this be a partially clogged cat or could it be something else? No codes either. Link to comment Share on other sites More sharing options...
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