I have a 02 maxima. It has a knock but its light, i use only sunoco 93 and have for two years i owned it. I noticed if i have to change gears and lean into it the car hesitates for a split sec then goes, but if i wind him out, sometimes he wont give me all he has, almost like its starving for fuel, people told me thats the timing retarding but i have no check engine light. the pinging i hear is very light but noticeable when at low rpms especially if i give him some gas and dont shift up. has 93k but nissan replaced motor at 58k under warranty. im told they replace the bottom end but put all the other stuff back on from original motor. please help me with this, and if its knock sensor, is it exspensive to rreplace? also heard it might be mass airflow sensor. nissan says knock sensor never goes bad, but this guys a sercvice writer, not a tech. not real sure how to retrieve responses so if you read this and can send a reply to my email, I would be forever in debt, its
[email protected] dont know what to do or how to begin to fix this, so far im told its a knock sensor, thats why when it pings it retards timing, if thats it, why no engine light? thanks for the help guy, Nick.