Thanks for considering my question. I have the model mentioned in the subject line. I've had it for about 6 years with pretty minimal problems. After sitting for a period of weeks, I cranked it one day. Start up was normal, but as I began to drive it seemed to spark knock or ping at even moderate throttle load. Prior to that time I only occasionally noticed pinging on a hill when I pushed or lugged the engine and had to down shift (pretty standard behavior). Now, I am puzzled as to why this pinging is so prevalent beyond light throttle. I tried some Seafoam and Techron and high octane gas, and the pinging pretty much persists. I have to be very light on the throttle to minimize it.
Another behavior that I THINK worsened at the same time....before fully warmed up, the engine is likely to die on lift throttle/return to idle such as when pushing in the clutch as I stop for a red light. Once warmed up, it usually returns to idle just fine.
Theories as to what may have changed while it sat?...or what I should try first to address this?
I do all of my own wrenching and have some theories, but I am hoping to hear from some folks experienced with this engine. VCDS is not showing anything obvious to me. I have the CO potentiometer on my engine NOT the idle position switch.