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Engine knock

Tiny
JWILKINS94
  • MEMBER
  • 2005 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
My car is knocking loudly. Oil has been changed and spark plugs and coil packs and almost every sensor in the car. Also the thermostat. The knock is very loud but there is no white smoke and no oil on the engine there are no signs of a rod going out that I have ever seen on a car in my life but it sounds horrible.
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Thursday, November 1st, 2018 AT 8:16 AM

1 Reply

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
No signs of a rod going out like what for instance because it could very well be that. I do not know of any specific signs other than the noise it makes. Perhaps you should post a video/audio recording of the noise. After the video try a pint of straight 50w motor oil in with the other oil and let it idle for a few minutes. If at any time the noise gets quieter, than it might just be a rod knocking. Then remove the oil pan and check each rod bearing for being smashed.
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Thursday, November 1st, 2018 AT 8:37 AM

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