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After changing, coil, spark plugs, crackshaft sensor. the Idle is high .once i turn on car i will go up till 2.5 then get fixed on 1.1, then when i put drive it goers to 900, once AC is ON IDL goes to 1100 , therefore AC sometimes get disconnected very rarely due to the unstable IDLE. no one knows how to fix it. I changed 3 Throttle Bodies, the repair garage told me they are damaged we need to find another one ( all used) , is there any chance i can fix it ? The dealer here, Nissan asking 500 dollars just for check up and not to fixing.
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nissans and infinitis are the worst cars to try and get the idle to relearn. You are going to need a shop to hook up a scan tool and try to relearn the idle. Many times you will need to pull some injectors or coils to get the idle low enough to relearn I also would not suggest a used throttle body on an infiniti. Spend the money and get a new one. Why did you change it in the first place? Did someone clean the old throttle body when doing the tune up?