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Old 11-02-2004, 04:30 PM   #1
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my 1998 pontiac bonneville has a loud knocking sound when i turn it on in the morning and after it gets warmed up it goes away and the check engine light turns on? what can this be?
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Old 11-02-2004, 05:56 PM   #2
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Where'* the noise coming from. Only when you idle, or all the time? A little more info could help out a little.
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Old 11-02-2004, 05:59 PM   #3
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Also how fast/loud of a knocking is it?
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Old 11-02-2004, 07:09 PM   #4
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only when its idle in the morning when first started. the knocking sound is pretty fast sounds like metal hitting against something. it sounds by the upper intake manifold.
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Old 11-03-2004, 12:51 AM   #5
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actually now everytime i start it it makes the sound for like 5 minutes then it goes away after i start driving. the oil pressure is good.
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Old 11-03-2004, 11:18 AM   #6
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lets hope its not a spun bearing or bent valve
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Old 11-03-2004, 04:28 PM   #7
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I'm guessing its a harmonic balancer. Thats the same conditions mine was when it went out.
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