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1993 Pontiac Grand Am Question: why do I hear a rattle or vibration from the engine area when cranked cold?

 

Question

burger37, Kansas City, MO, November 18, 2012, 18:16
 Rookie

It seems to quiet down when the engine gets warmer.

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  • Answer #1

    November 18, 2012, 19:50
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     Master

    What engine? That is alwsys good to know!

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    burger37, November 19, 2012, 07:07
     Rookie

    Quad 4 four cylinder. I think it could be bad motor mounts since it quiets down after engine gets warmed up good. Does anyone agree?

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    pushrod, November 19, 2012, 07:29
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     Master

    Two things i suggest, listen under hood as soon as engine is started cold, timing chains make noise
    when cold due to worn componets. Also check cat converter for defective catalyst, may not rattle when warmed up.
    Motor mounts could be worn as well. But i am just guessing on all of this.

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  • Medium-star Best Answer
    November 18, 2012, 19:52
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     Master

    something is probably loose...whatever size engine you have

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    pushrod, November 18, 2012, 20:00
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     Master

    Yea i bet something is loose, but a quad 4 has a few things i may be able to help with.

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  • Answer #3

    Greg's Orange Auto (13991 Answers) , Orange, CA - (714) 361-9386
    globalhelper November 19, 2012, 07:06
     Master

    seek a diag and est from your mech as i would only be guessing

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  • Answer #4

    November 21, 2012, 06:58
     Master

    Does the engine run rough on start-up? Is it a rattle or a vibration , that concerns you most? How does it change when you put it in gear? --When cold , then when warmed up? ..... More than one problem.......

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    pushrod, November 21, 2012, 07:26
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     Master

    Hi zip i have a problem i will post the question think about it and see what you think 02 Civic sedan 1.7.

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    ziptie12, November 21, 2012, 17:51
     Master

    Hope the response helped , I replied before I saw this response>........never mind!

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  • Answer #5

    July 27, 2013, 18:09
     Master

    quad 4s were always bad for timing chain noise

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