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Thread: car makes weird "knocking" sound when accelerating in 1st

  1. #1
    Registered Member huber's Avatar

    2000 Protege SE

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    car makes weird "knocking" sound when accelerating in 1st

    hey guys, this is my first post on the forum. so if i have this in the wrong area i didnt intend to.

    i came here to ask why my car makes a sort of knocking, or rattling sound when first accelerating from a stop in first gear. im not bagging it right off the start. shifting at 2500-3000 rpms. just "nicely" driving it. only does it in first and gets progressively quicker of a rattle or knocking the faster i go in first. but ive only gone up to 3000 rpm's with it. i have no idea what could have caused it.
    Huber

  2. #2
    Registered Member tweety2300's Avatar

    2001 mazda protege mp3

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    Lifter rod bearing or heat shield

  3. #3
    Registered Member huber's Avatar

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    thanks, i was going to check my heat shield yesterday, but it was too late in the night, and i was too tired, haha!
    thanks!
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  4. #4
    Registered Member

    Mazda 2002 BJ Astina 323 1.8 L

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    Quote Originally Posted by huber View Post
    thanks, i was going to check my heat shield yesterday, but it was too late in the night, and i was too tired, haha!
    thanks!
    It may be pinging,..which is something the knock-sensor should handle by passing a signal to the ECU to retard the ignition. Pinging sounds just like a bag of bottle-caps being shaken. Just mention it as a possibility :-)

    JJ

  5. #5
    Registered Member huber's Avatar

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    checked the heat shields, nothing, still does it in first. checked cv axels, brakes, shields, nothing. its starting to really tick me off haha.
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  6. #6
    Registered Member huber's Avatar

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    it also sounds really bad when i downshift into first, going SLOW!
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  7. #7
    Registered Member tweety2300's Avatar

    2001 mazda protege mp3

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    Lifter

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