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I have a 96 Altima with 90K on it. Recently idling started going bad with a drop in mileage and exhaust ejecting lots of smoke. The car keeps jumping around 500 - 700RPM when at a halt. Soon the check system light came on and went off again in half an hour. I got the AutoZOne people have a look at the error codes and they said it was one of the Knock Sensors and another one was for Cylinder 4 misfire.
I took the car to one of the mechanics and he tested the cables and spark plug. All of them seemed fine with no carbon desposit. Then he checked the compression level in cylinder 4 which came about 90 to 100 which he said was low according to the standards. Now he is asking me about 2 grand for the complete engine service. So is that wat it really takes to get the needed compression level back.. what problems i am looking at if i dont get it repaired.. and what is actually causing the compression drop.. Please suggest?
I took the car to one of the mechanics and he tested the cables and spark plug. All of them seemed fine with no carbon desposit. Then he checked the compression level in cylinder 4 which came about 90 to 100 which he said was low according to the standards. Now he is asking me about 2 grand for the complete engine service. So is that wat it really takes to get the needed compression level back.. what problems i am looking at if i dont get it repaired.. and what is actually causing the compression drop.. Please suggest?