Question about 1999 Chevrolet Blazer

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I have a 98 blazer and everytime I start it up when its been sitting for awhile it make this loud knocking noise. After a minuet or 2 it stops and idles perfect, is there any way to stop it from doing this everytime I start it up or do I just have to live with it?

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Hi depending on the amount of miles that are on your vehicle, it may be the engine has loose clearances, and the oil may take time to pressurize enough, and the engine to warm up enough, for the noise to go away. If it is a deep thud noise, it could be lower end wear. If it is a light tapping, it could bein the upper end. These are examples of worse case scenarios. On a lighter note, oil level is crucial, and some aftermarket oil filters do not have a bleedback valve in them, causing oil to drain comletely back into the pan, when the engine sits. A known good filter, such as a factory ac, will have this valve. I would suggest an oil change, with an anti bleedback filter, to see if this improves. If not, possible excessive clearances may cause this. Additives may actually cause other issues. If the noise does not lessen with an oil change, I would get an opinion from a reputable garage. Good luck...Coop

Posted on Oct 05, 2010

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1 Answer

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==== I would check the fluid level on the power steering first. Check for pink fluid leak on the ground,
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Please post more info on the comment window.
I will follow up on it.

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