What can cause a loud knocking noise and how much is average repair cost

Tiny
SKINNY1983
  • MEMBER
  • 1995 CADILLAC SLS
  • 140,000 MILES
I have a 95 sls I bought it with 120k miles on it, it has leaked oil since I got it but ran and still does run strong. I went on vacation came back 5 days later and started the car to drive it to work bout 1t miles down the road it started knocking the oil pressure and level where fine it now feels as if there is a miss and the car wants to shut off at idle. Obviuosly I haven't driven it anymore. Any advice?
Thursday, March 29th, 2012 AT 3:03 PM

4 Replies

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
It sounds like a bad wrist pin. I had a car that I drove for almost a year with a loud knock and took some long trips in it.
You probably need an engine rebuild.
It will be in the neighborhood of $3000-$4000, depending on where you get it fixed.
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Thursday, March 29th, 2012 AT 6:23 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
I had a car that knocked cold but warmed up it went away and it was wrist pins when I took it apart they were gummed tight with varnish. I didn't know what was knocking if I had known it was pins I would have tried a solvent varnish remover first.
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Thursday, March 29th, 2012 AT 7:26 PM
Tiny
SKINNY1983
  • MEMBER
  • 2 POSTS
Would I need to take the engine apart to use the varnish remover?
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Thursday, March 29th, 2012 AT 10:40 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
I would have tried without taking engine apart if I knew that was problem beforehand. But like I said, my noise went away after thorough warm up.
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Friday, March 30th, 2012 AT 4:40 PM

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