Question about 1996 GMC Sierra

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Oil pump goes bad what are the symptoms? I was driving and heard a loud noise now my truck is running rough and sluggish and there is no oil pressure at the gauge. There's a loud knocking under the floorboard?

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  • Master
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No oil pressure ( oil light on low reading on oil gauge ) about a 1mim or so with no oil pressure, knocking in engine damage main and piston rod bearing, will need engine replacement.

Posted on May 31, 2010

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  • GMC Master
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It sounds like you have slipped a bearing and you'll need a new engine. You get most of your oil pressure from your connecting rod bearing and crank shaft bearing, you still have some oil pressure. No oil pressure will cause your engines ECM to shut the engine down, but from what you have described. The engine is to far gone for repairs and a engine swap would be the more economical thing to do.
Thank you for using fixya and sorry for the bad news.

Posted on May 31, 2010

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I took my 2005 Chev. Malibu in for an oil change and now it is making a loud noise from the engine. they say its the water pump? is that possible?


  • Hi, I can help.
  • When your water pump goes bad it will begin to grind. I had one I let got far to long and it sounded deafening when I opened the hood. You can open your hood and listen and see for yourself. The water pump is on the belt line, left side under the hood, last pulley toward the rear.
  • Now if your asking can an oil change effect the water pump? No, not at all. Water pumps go sporadically.
  • It would be odd that you heard no noises before the oil change and now the water pump is loud enough to take notice after the oil change. The bearings usually go a little slower than that.

  • I would be interested in some more of the details to this. And what your overall concerns are. I'd be happy to further. help. Otherwise get a second opinion on your cars condition.


  • Hope this helps and thank you for using FixYa.

Regards, Tony

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How would i no if i need a oil pump?


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