Anonymous asked in Cars & TransportationCar MakesChevrolet · 1 decade ago

89 chev trk 5.7 tbi what does the knock sensor do?

runs fine then light goes on, idle goes up. under load i get spark knock or pings. whats up?

6 Answers

  • CV9516
    Lv 4
    1 decade ago
    Favorite Answer

    The knock sensor advances or retards the timing based on engine conditions. A bad sensor will give you a check engine light. They are not expensive or hard to change. You will have to drain the anti-freeze from the engine block though. remove the sensor and it will drain from the sensor's hole. Put the new sensor in, refill your coolant and your done.

  • Anonymous
    1 decade ago

    try a tankful of premium if that helps then possibly try colder spark plugs and see if the knocking goes away.

    A knock sensor generally retards the timing so it doesn't go through preignition.

  • 1 decade ago

    A knock sensor retards the ignition timing when it detects spark knock.

  • 1 decade ago

    you likely got a bad batch of gas. it happens, id drain the tank if you can and fill it with good fuel then see if goes away. i got a batch so bad in my old turbo car that not only did the knock control unit retard the timing, it also dropped the ign. completely at high boost. i put in better gas from a better station and it went away.

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  • 3 years ago

    you have solid gas rigidity for this type of gas equipment you're able to desire to verify injector pulse first least confusing finished with a noid gentle this gadget usually runs approximately $15.00 at a areas save for a equipment preserve it and you will on no account could desire to purchase yet another one it plugs into the injector wires and could flash as you crank if it flashes the injector needs to get replaced no rely if that is not any longer spraying gas in the throttle physique no rely if that is not any longer flashing solid danger the pickup is undesirable in the distributor and you will % extra attempt at this component i could carry it to a save

  • 1 decade ago

    ya need a t-up plug wires ,.plugs seems the wires have to much resistence ,causing missfires

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