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1989 Pontiac Firebird Engine noise high RPMs

Tiny
ARTSYMOND
  • MEMBER
  • 1989 PONTIAC FIREBIRD
  • 5.0L
  • V8
  • RWD
  • MANUAL
  • 100,000 MILES
After 2500 rpm the engine has a knock. I don't dare push to see if lose of power has occurred. A mechanic told me it was "shot" but wanted to pay me 500.$ Seems like it could be solvable but I want a honest opinion. It is a rapid knocking it has to be piston but could it be a cracked valve or stuck valve? I'd like to know what I can do to find out if it is really "shot" or if it is something I could fix I my garage with limited tools or diagnose. It is my fav car fun to drive and would kill me to sale it over a simple fix. Also he told us 6500$ to fix as a poor car enthusiast I can't get a new crate 305. Please point me in a good direction!
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Sunday, February 22nd, 2015 AT 9:52 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Rev to 2500 and pull one plug wire at a time to isolate cylinder. A bad piston will sound more like a hard tapping noise and a rod which it sounds like will have a deeper sound. If the rod bearing hasn't spun inside the rod you can put a crank kit in it. Otherwise it's pretty much shot
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Sunday, February 22nd, 2015 AT 10:46 AM

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