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knock sensor? or bigger problems?

This is a discussion on knock sensor? or bigger problems? within the Internal Engine forums, part of the LSx Technical Help Section category; So my car threw a knock sensor code on me a couple weeks ago. Got out my trusty OBDII tool ...

  1. #1
    Junior Member 98B4C's Avatar
    Join Date
    Jun 2008
    McCook, NE

    1998 B4C LS1/A4

    knock sensor? or bigger problems?

    So my car threw a knock sensor code on me a couple weeks ago. Got out my trusty OBDII tool and cleared it. I had noticed a slight skip, and since I've only had the car a month or so, I decided to go ahead with a plug/wire change. Did that, and a few days later the code came back up. It seems to clear for a few days at a time, and the car runs fine until the code pops and it retards the daylights out of the ignition. I brought it to a mechanic friend of mine, and he noticed a slight knock, nothing really loud, in fact it took me a while to hear it when he pointed it out and also a slight vibration at about 2200rpm. I know these cars have always had loud valvetrains, but he seemed to think it is a wrist pin. My dad has been a mechanic for 40 years, and he listened to it before I brought it to the shop, and didn't hear it. Anyone have a clue? I'm really not enthused about tearing the engine down, but I want my car to run right.

  2. #2
    Senior Member
    Join Date
    Jan 2006
    san diego

    01 ws6

    i washed my engine and my knock sensor threw a light

    took off intake and replaced both of them in about an hour

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